From f0a50b3e70d56f4e9caedbabeebe841d754745fa Mon Sep 17 00:00:00 2001
From: Andrej Rasevic <andrej@rasevicengineering.com>
Date: Tue, 14 Jan 2025 21:28:03 -0500
Subject: [PATCH] adding Project 1

---
 .../cli/cobra/advanced/example_01/go.mod      |   5 +
 .../cli/cobra/advanced/example_01/go.sum      | 285 ++++++++++++++++
 .../cli/cobra/advanced/example_01/main.go     |  45 +++
 .../cli/cobra/advanced/example_02/go.mod      |   5 +
 .../cli/cobra/advanced/example_02/go.sum      | 289 +++++++++++++++++
 .../cli/cobra/advanced/example_02/main.go     |  49 +++
 .../cli/cobra/advanced/example_02/test.1      |  42 +++
 .../cli/cobra/advanced/example_02/test.md     |  26 ++
 .../cli/cobra/advanced/example_02/test.rst    |  33 ++
 .../cli/cobra/advanced/example_02/test.yaml   |  13 +
 .../cli/cobra/advanced/example_03/LICENSE     | 202 ++++++++++++
 .../cli/cobra/advanced/example_03/cmd/root.go |  85 +++++
 .../cli/cobra/advanced/example_03/cmd/test.go |  51 +++
 .../cli/cobra/advanced/example_03/go.mod      |   9 +
 .../cli/cobra/advanced/example_03/go.sum      | 301 +++++++++++++++++
 .../cli/cobra/advanced/example_03/main.go     |  22 ++
 .../cli/cobra/advanced/example_04/go.mod      |   5 +
 .../cli/cobra/advanced/example_04/go.sum      | 303 ++++++++++++++++++
 .../cli/cobra/advanced/example_04/say.go      |  60 ++++
 .../advanced/example_05/cmd/completion.go     |  28 ++
 .../cli/cobra/advanced/example_05/db.go       |  44 +++
 .../cli/cobra/advanced/example_05/go.mod      |   5 +
 .../cli/cobra/advanced/example_05/go.sum      | 303 ++++++++++++++++++
 .../cli/cobra/basics/example_01/go.mod        |   5 +
 .../cli/cobra/basics/example_01/go.sum        | 286 +++++++++++++++++
 .../cli/cobra/basics/example_01/hello.go      |  25 ++
 .../cli/cobra/commands/example_01/go.mod      |   5 +
 .../cli/cobra/commands/example_01/go.sum      | 299 +++++++++++++++++
 .../cli/cobra/commands/example_01/say.go      |  39 +++
 .../cli/cobra/commands/example_02/go.mod      |   5 +
 .../cli/cobra/commands/example_02/go.sum      | 299 +++++++++++++++++
 .../cli/cobra/commands/example_02/say.go      |  53 +++
 .../cli/cobra/commands/example_03/go.mod      |   5 +
 .../cli/cobra/commands/example_03/go.sum      | 300 +++++++++++++++++
 .../cli/cobra/commands/example_03/say.go      |  47 +++
 .../cli/cobra/flags/example_01/go.mod         |   3 +
 .../cli/cobra/flags/example_01/go.sum         | 285 ++++++++++++++++
 .../cli/cobra/flags/example_01/main.go        |  23 ++
 .../cli/cobra/flags/example_02/go.mod         |   3 +
 .../cli/cobra/flags/example_02/go.sum         | 299 +++++++++++++++++
 .../cli/cobra/flags/example_02/main.go        |  29 ++
 .../cli/cobra/flags/example_03/go.mod         |   3 +
 .../cli/cobra/flags/example_03/go.sum         | 299 +++++++++++++++++
 .../cli/cobra/flags/example_03/main.go        |  33 ++
 .../cli/cobra/flags/example_04/go.mod         |   5 +
 .../cli/cobra/flags/example_04/go.sum         | 299 +++++++++++++++++
 .../cli/cobra/flags/example_04/main.go        |  35 ++
 .../cli/cobra/flags/example_05/go.mod         |   5 +
 .../cli/cobra/flags/example_05/go.sum         | 299 +++++++++++++++++
 .../cli/cobra/flags/example_05/main.go        |  36 +++
 LectureCodeExamples/kafka/README.md           |  28 ++
 .../kafka/confluent/example_01/consumer.go    |  35 ++
 .../kafka/confluent/example_01/go.mod         |   5 +
 .../kafka/confluent/example_01/go.sum         |   2 +
 .../kafka/confluent/example_01/producer.go    |  33 ++
 .../kafka/confluent/example_02/consumer.go    |  51 +++
 .../kafka/confluent/example_02/go.mod         |   5 +
 .../kafka/confluent/example_02/go.sum         |   2 +
 .../kafka/confluent/example_02/producer.go    |  44 +++
 .../kafka/confluent/example_02a/consumer.go   |  42 +++
 .../kafka/confluent/example_02a/producer.go   |  34 ++
 LectureCodeExamples/kafka/docker-compose.yml  |  70 ++++
 .../kafka/rest/example_01/consumer.go         |  89 +++++
 .../kafka/rest/example_01/go.mod              |   3 +
 .../kafka/rest/example_01/producer.go         |  52 +++
 .../kafka/segmentio/example_01/consumer.go    |  32 ++
 .../kafka/segmentio/example_01/go.mod         |   5 +
 .../kafka/segmentio/example_01/go.sum         |  23 ++
 .../kafka/segmentio/example_01/producer.go    |  30 ++
 .../kafka/segmentio/example_02/consumer.go    |  31 ++
 .../kafka/segmentio/example_02/go.mod         |   5 +
 .../kafka/segmentio/example_02/go.sum         |  34 ++
 .../kafka/segmentio/example_02/producer.go    |  26 ++
 .../logger/log/example_01/main.go             |  14 +
 .../logger/log/example_02/main.go             |  16 +
 .../logger/zerolog/advanced/example_01/go.mod |   5 +
 .../logger/zerolog/advanced/example_01/go.sum |  12 +
 .../zerolog/advanced/example_01/main.go       |  30 ++
 .../logger/zerolog/advanced/example_02/go.mod |   5 +
 .../logger/zerolog/advanced/example_02/go.sum |  12 +
 .../zerolog/advanced/example_02/main.go       |  14 +
 .../logger/zerolog/advanced/example_03/go.mod |   5 +
 .../logger/zerolog/advanced/example_03/go.sum |  12 +
 .../zerolog/advanced/example_03/main.go       |  19 ++
 .../logger/zerolog/advanced/example_04/go.mod |   5 +
 .../logger/zerolog/advanced/example_04/go.sum |  13 +
 .../zerolog/advanced/example_04/main.go       |  30 ++
 .../logger/zerolog/advanced/example_05/go.mod |   5 +
 .../logger/zerolog/advanced/example_05/go.sum |  13 +
 .../zerolog/advanced/example_05/main.go       |  50 +++
 .../logger/zerolog/basics/example_01/go.mod   |   5 +
 .../logger/zerolog/basics/example_01/go.sum   |  12 +
 .../logger/zerolog/basics/example_01/main.go  |  16 +
 .../logger/zerolog/basics/example_02/go.mod   |   5 +
 .../logger/zerolog/basics/example_02/go.sum   |  12 +
 .../logger/zerolog/basics/example_02/main.go  |  17 +
 .../logger/zerolog/basics/example_03/go.mod   |   5 +
 .../logger/zerolog/basics/example_03/go.sum   |  12 +
 .../logger/zerolog/basics/example_03/main.go  |  11 +
 .../logger/zerolog/basics/example_04/go.mod   |   5 +
 .../logger/zerolog/basics/example_04/go.sum   |  12 +
 .../logger/zerolog/basics/example_04/main.go  |  29 ++
 .../logger/zerolog/basics/example_05/go.mod   |   5 +
 .../logger/zerolog/basics/example_05/go.sum   |  13 +
 .../logger/zerolog/basics/example_05/main.go  |  12 +
 .../logger/zerolog/basics/example_06/go.mod   |   5 +
 .../logger/zerolog/basics/example_06/go.sum   |  13 +
 .../logger/zerolog/basics/example_06/main.go  |  27 ++
 .../logger/zerolog/settings/example_01/go.mod |   5 +
 .../logger/zerolog/settings/example_01/go.sum |  12 +
 .../zerolog/settings/example_01/main.go       |  22 ++
 .../logger/zerolog/settings/example_02/go.mod |   5 +
 .../logger/zerolog/settings/example_02/go.sum |  12 +
 .../zerolog/settings/example_02/main.go       |  29 ++
 .../logger/zerolog/settings/example_03/go.mod |   5 +
 .../logger/zerolog/settings/example_03/go.sum |  12 +
 .../zerolog/settings/example_03/main.go       |  29 ++
 .../logger/zerolog/settings/example_04/go.mod |   5 +
 .../logger/zerolog/settings/example_04/go.sum |  12 +
 .../zerolog/settings/example_04/main.go       |  14 +
 LectureCodeExamples/sql/README.md             |   9 +
 .../sql/gorm/example_01/go.mod                |   5 +
 .../sql/gorm/example_01/go.sum                |  10 +
 .../sql/gorm/example_01/main.go               |  37 +++
 .../sql/gorm/manipulate/example_01/go.mod     |   8 +
 .../sql/gorm/manipulate/example_01/go.sum     |  11 +
 .../sql/gorm/manipulate/example_01/main.go    |  34 ++
 .../sql/gorm/manipulate/example_02/go.mod     |   8 +
 .../sql/gorm/manipulate/example_02/go.sum     |  11 +
 .../sql/gorm/manipulate/example_02/main.go    |  56 ++++
 .../sql/gorm/manipulate/example_03/go.mod     |   8 +
 .../sql/gorm/manipulate/example_03/go.sum     |  11 +
 .../sql/gorm/manipulate/example_03/main.go    |  50 +++
 .../sql/gorm/manipulate/example_04/go.mod     |   8 +
 .../sql/gorm/manipulate/example_04/go.sum     |  11 +
 .../sql/gorm/manipulate/example_04/main.go    |  39 +++
 .../sql/gorm/modelling/example_01/go.mod      |   8 +
 .../sql/gorm/modelling/example_01/go.sum      |  11 +
 .../sql/gorm/modelling/example_01/main.go     |  57 ++++
 .../sql/gorm/modelling/example_02/go.mod      |   8 +
 .../sql/gorm/modelling/example_02/go.sum      |  11 +
 .../sql/gorm/modelling/example_02/main.go     |  42 +++
 .../sql/gorm/modelling/example_03/go.mod      |   9 +
 .../sql/gorm/modelling/example_03/go.sum      |  15 +
 .../sql/gorm/modelling/example_03/main.go     |  43 +++
 .../sql/gorm/modelling/example_04/go.mod      |   9 +
 .../sql/gorm/modelling/example_04/go.sum      |  15 +
 .../sql/gorm/modelling/example_04/main.go     |  47 +++
 .../sql/gorm/modelling/example_05/go.mod      |   8 +
 .../sql/gorm/modelling/example_05/go.sum      |  11 +
 .../sql/gorm/modelling/example_05/main.go     |  53 +++
 .../sql/gorm/transactions/example_01/go.mod   |   8 +
 .../sql/gorm/transactions/example_01/go.sum   |  11 +
 .../sql/gorm/transactions/example_01/main.go  |  44 +++
 .../sql/gorm/transactions/example_02/go.mod   |   8 +
 .../sql/gorm/transactions/example_02/go.sum   |  11 +
 .../sql/gorm/transactions/example_02/main.go  |  52 +++
 LectureCodeExamples/sql/sql/example_01/go.mod |   5 +
 LectureCodeExamples/sql/sql/example_01/go.sum |   2 +
 .../sql/sql/example_01/main.go                |  32 ++
 LectureCodeExamples/sql/sql/example_02/go.mod |   5 +
 LectureCodeExamples/sql/sql/example_02/go.sum |   2 +
 .../sql/sql/example_02/main.go                |  68 ++++
 LectureCodeExamples/sql/sql/example_03/go.mod |   5 +
 LectureCodeExamples/sql/sql/example_03/go.sum |   2 +
 .../sql/sql/example_03/main.go                |  53 +++
 LectureCodeExamples/sql/sql/example_04/go.mod |   5 +
 LectureCodeExamples/sql/sql/example_04/go.sum |   2 +
 .../sql/sql/example_04/main.go                |  51 +++
 LectureCodeExamples/sql/sql/example_05/go.mod |   5 +
 LectureCodeExamples/sql/sql/example_05/go.sum |   2 +
 .../sql/sql/example_05/main.go                |  57 ++++
 Projects/Project1/Project1Description.md      |  67 ++++
 Projects/Project1/db/db.go                    |  72 +++++
 Projects/Project1/docker-compose.yml          |  18 ++
 Projects/Project1/go.mod                      |   5 +
 Projects/Project1/go.sum                      |   2 +
 Projects/Project1/main.go                     |  53 +++
 Projects/Project1/model/book.go               |   6 +
 179 files changed, 7869 insertions(+)
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_01/go.mod
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_01/go.sum
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_01/main.go
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_02/go.mod
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_02/go.sum
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_02/main.go
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_02/test.1
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_02/test.md
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_02/test.rst
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_02/test.yaml
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_03/LICENSE
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_03/cmd/root.go
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_03/cmd/test.go
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_03/go.mod
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_03/go.sum
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_03/main.go
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_04/go.mod
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_04/go.sum
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_04/say.go
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_05/cmd/completion.go
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_05/db.go
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_05/go.mod
 create mode 100644 LectureCodeExamples/cli/cobra/advanced/example_05/go.sum
 create mode 100644 LectureCodeExamples/cli/cobra/basics/example_01/go.mod
 create mode 100644 LectureCodeExamples/cli/cobra/basics/example_01/go.sum
 create mode 100644 LectureCodeExamples/cli/cobra/basics/example_01/hello.go
 create mode 100644 LectureCodeExamples/cli/cobra/commands/example_01/go.mod
 create mode 100644 LectureCodeExamples/cli/cobra/commands/example_01/go.sum
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 create mode 100644 LectureCodeExamples/cli/cobra/commands/example_02/go.mod
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 create mode 100644 LectureCodeExamples/cli/cobra/commands/example_03/go.mod
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 create mode 100644 LectureCodeExamples/cli/cobra/flags/example_01/go.mod
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 create mode 100644 LectureCodeExamples/cli/cobra/flags/example_03/go.mod
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 create mode 100644 LectureCodeExamples/cli/cobra/flags/example_03/main.go
 create mode 100644 LectureCodeExamples/cli/cobra/flags/example_04/go.mod
 create mode 100644 LectureCodeExamples/cli/cobra/flags/example_04/go.sum
 create mode 100644 LectureCodeExamples/cli/cobra/flags/example_04/main.go
 create mode 100644 LectureCodeExamples/cli/cobra/flags/example_05/go.mod
 create mode 100644 LectureCodeExamples/cli/cobra/flags/example_05/go.sum
 create mode 100644 LectureCodeExamples/cli/cobra/flags/example_05/main.go
 create mode 100644 LectureCodeExamples/kafka/README.md
 create mode 100644 LectureCodeExamples/kafka/confluent/example_01/consumer.go
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 create mode 100644 LectureCodeExamples/kafka/confluent/example_02/producer.go
 create mode 100644 LectureCodeExamples/kafka/confluent/example_02a/consumer.go
 create mode 100644 LectureCodeExamples/kafka/confluent/example_02a/producer.go
 create mode 100644 LectureCodeExamples/kafka/docker-compose.yml
 create mode 100644 LectureCodeExamples/kafka/rest/example_01/consumer.go
 create mode 100644 LectureCodeExamples/kafka/rest/example_01/go.mod
 create mode 100644 LectureCodeExamples/kafka/rest/example_01/producer.go
 create mode 100644 LectureCodeExamples/kafka/segmentio/example_01/consumer.go
 create mode 100644 LectureCodeExamples/kafka/segmentio/example_01/go.mod
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 create mode 100644 LectureCodeExamples/kafka/segmentio/example_01/producer.go
 create mode 100644 LectureCodeExamples/kafka/segmentio/example_02/consumer.go
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 create mode 100644 LectureCodeExamples/logger/log/example_01/main.go
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 create mode 100644 LectureCodeExamples/sql/sql/example_01/main.go
 create mode 100644 LectureCodeExamples/sql/sql/example_02/go.mod
 create mode 100644 LectureCodeExamples/sql/sql/example_02/go.sum
 create mode 100644 LectureCodeExamples/sql/sql/example_02/main.go
 create mode 100644 LectureCodeExamples/sql/sql/example_03/go.mod
 create mode 100644 LectureCodeExamples/sql/sql/example_03/go.sum
 create mode 100644 LectureCodeExamples/sql/sql/example_03/main.go
 create mode 100644 LectureCodeExamples/sql/sql/example_04/go.mod
 create mode 100644 LectureCodeExamples/sql/sql/example_04/go.sum
 create mode 100644 LectureCodeExamples/sql/sql/example_04/main.go
 create mode 100644 LectureCodeExamples/sql/sql/example_05/go.mod
 create mode 100644 LectureCodeExamples/sql/sql/example_05/go.sum
 create mode 100644 LectureCodeExamples/sql/sql/example_05/main.go
 create mode 100644 Projects/Project1/Project1Description.md
 create mode 100644 Projects/Project1/db/db.go
 create mode 100644 Projects/Project1/docker-compose.yml
 create mode 100644 Projects/Project1/go.mod
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 create mode 100644 Projects/Project1/main.go
 create mode 100644 Projects/Project1/model/book.go

diff --git a/LectureCodeExamples/cli/cobra/advanced/example_01/go.mod b/LectureCodeExamples/cli/cobra/advanced/example_01/go.mod
new file mode 100644
index 0000000..0d8feef
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_01/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/advanced/example_01
+
+go 1.15
+
+require github.com/spf13/cobra v1.1.3 // indirect
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_01/go.sum b/LectureCodeExamples/cli/cobra/advanced/example_01/go.sum
new file mode 100644
index 0000000..381fa9a
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_01/go.sum
@@ -0,0 +1,285 @@
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diff --git a/LectureCodeExamples/cli/cobra/advanced/example_01/main.go b/LectureCodeExamples/cli/cobra/advanced/example_01/main.go
new file mode 100644
index 0000000..dc6b225
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_01/main.go
@@ -0,0 +1,45 @@
+package main
+
+import (
+    "errors"
+    "fmt"
+    "github.com/spf13/cobra"
+    "os"
+)
+
+var RootCmd = &cobra.Command{
+    Use: "main",
+    Short: "short message",
+}
+
+var ActionCmd = &cobra.Command{
+    Use: "action",
+    Args: cobra.MinimumNArgs(2),
+    Run: func(cmd *cobra.Command, args []string) {
+        fmt.Println("Do something with ",args)
+    },
+}
+
+func helper (cmd *cobra.Command, args []string) {
+    fmt.Printf("You entered command %s\n", cmd.Name())
+    fmt.Println("And that is all the help we have right now :)")
+}
+
+func usager (cmd *cobra.Command) error {
+    fmt.Printf("You entered command %s\n", cmd.Name())
+    fmt.Println("And you do not know how it works :)")
+    return errors.New("Something went wrong :(")
+}
+
+func main() {
+    RootCmd.AddCommand(ActionCmd)
+    RootCmd.SetHelpFunc(helper)
+    RootCmd.SetUsageFunc(usager)
+
+    ActionCmd.Flags().Bool("now",false,"Do it now")
+
+    if err := RootCmd.Execute(); err != nil {
+        fmt.Fprintln(os.Stderr, err)
+        os.Exit(1)
+    }
+}
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_02/go.mod b/LectureCodeExamples/cli/cobra/advanced/example_02/go.mod
new file mode 100644
index 0000000..a37572e
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_02/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/advanced/example_02
+
+go 1.15
+
+require github.com/spf13/cobra v1.1.3 // indirect
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_02/go.sum b/LectureCodeExamples/cli/cobra/advanced/example_02/go.sum
new file mode 100644
index 0000000..fe36187
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_02/go.sum
@@ -0,0 +1,289 @@
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diff --git a/LectureCodeExamples/cli/cobra/advanced/example_02/main.go b/LectureCodeExamples/cli/cobra/advanced/example_02/main.go
new file mode 100644
index 0000000..97ec7ef
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_02/main.go
@@ -0,0 +1,49 @@
+package main
+
+import (
+    "fmt"
+    "github.com/spf13/cobra"
+    "github.com/spf13/cobra/doc"
+    "os"
+)
+
+var RootCmd = &cobra.Command{
+    Use: "test",
+    Short: "Documented test",
+    Long: "How to document a command",
+    Example: "./main test",
+    Run: func(cmd *cobra.Command, args []string) {
+        fmt.Println("Save the world with Go!!!")
+    },
+}
+
+func main() {
+
+    RootCmd.Flags().Bool("flag",true,"Some flag")
+
+    header := &doc.GenManHeader{
+        Title: "Test",
+        Manual: "MyManual",
+        Section: "1",
+    }
+    err := doc.GenManTree(RootCmd, header, ".")
+    if err != nil {
+        panic(err)
+    }
+    err = doc.GenMarkdownTree(RootCmd, ".")
+    if err != nil {
+        panic(err)
+    }
+    err = doc.GenReSTTree(RootCmd, ".")
+    if err != nil {
+        panic(err)
+    }
+    err = doc.GenYamlTree(RootCmd, ".")
+    if err != nil {
+        panic(err)
+    }
+    if err := RootCmd.Execute(); err != nil {
+        fmt.Fprintln(os.Stderr, err)
+        os.Exit(1)
+    }
+}
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_02/test.1 b/LectureCodeExamples/cli/cobra/advanced/example_02/test.1
new file mode 100644
index 0000000..1ebba32
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_02/test.1
@@ -0,0 +1,42 @@
+.nh
+.TH "Test" "1" "Feb 2021" "Auto generated by spf13/cobra" "MyManual"
+
+.SH NAME
+.PP
+test \- Documented test
+
+
+.SH SYNOPSIS
+.PP
+\fBtest [flags]\fP
+
+
+.SH DESCRIPTION
+.PP
+How to document a command
+
+
+.SH OPTIONS
+.PP
+\fB\-\-flag\fP[=true]
+	Some flag
+
+.PP
+\fB\-h\fP, \fB\-\-help\fP[=false]
+	help for test
+
+
+.SH EXAMPLE
+.PP
+.RS
+
+.nf
+\&./main test
+
+.fi
+.RE
+
+
+.SH HISTORY
+.PP
+25\-Feb\-2021 Auto generated by spf13/cobra
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_02/test.md b/LectureCodeExamples/cli/cobra/advanced/example_02/test.md
new file mode 100644
index 0000000..93ee43f
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_02/test.md
@@ -0,0 +1,26 @@
+## test
+
+Documented test
+
+### Synopsis
+
+How to document a command
+
+```
+test [flags]
+```
+
+### Examples
+
+```
+./main test
+```
+
+### Options
+
+```
+      --flag   Some flag (default true)
+  -h, --help   help for test
+```
+
+###### Auto generated by spf13/cobra on 25-Feb-2021
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_02/test.rst b/LectureCodeExamples/cli/cobra/advanced/example_02/test.rst
new file mode 100644
index 0000000..4defe58
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_02/test.rst
@@ -0,0 +1,33 @@
+.. _test:
+
+test
+----
+
+Documented test
+
+Synopsis
+~~~~~~~~
+
+
+How to document a command
+
+::
+
+  test [flags]
+
+Examples
+~~~~~~~~
+
+::
+
+  ./main test
+
+Options
+~~~~~~~
+
+::
+
+      --flag   Some flag (default true)
+  -h, --help   help for test
+
+*Auto generated by spf13/cobra on 25-Feb-2021*
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_02/test.yaml b/LectureCodeExamples/cli/cobra/advanced/example_02/test.yaml
new file mode 100644
index 0000000..8a7218a
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_02/test.yaml
@@ -0,0 +1,13 @@
+name: test
+synopsis: Documented test
+description: How to document a command
+usage: test [flags]
+options:
+- name: flag
+  default_value: "true"
+  usage: Some flag
+- name: help
+  shorthand: h
+  default_value: "false"
+  usage: help for test
+example: ./main test
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_03/LICENSE b/LectureCodeExamples/cli/cobra/advanced/example_03/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_03/LICENSE
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+      any Contribution intentionally submitted for inclusion in the Work
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diff --git a/LectureCodeExamples/cli/cobra/advanced/example_03/cmd/root.go b/LectureCodeExamples/cli/cobra/advanced/example_03/cmd/root.go
new file mode 100644
index 0000000..10b8c99
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_03/cmd/root.go
@@ -0,0 +1,85 @@
+/*
+Copyright © 2021 NAME HERE <EMAIL ADDRESS>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"github.com/spf13/cobra"
+
+	homedir "github.com/mitchellh/go-homedir"
+	"github.com/spf13/viper"
+)
+
+var cfgFile string
+
+// rootCmd represents the base command when called without any subcommands
+var rootCmd = &cobra.Command{
+	Use:   "example_03",
+	Short: "A brief description of your application",
+	Long: `A longer description that spans multiple lines and likely contains
+examples and usage of using your application. For example:
+
+Cobra is a CLI library for Go that empowers applications.
+This application is a tool to generate the needed files
+to quickly create a Cobra application.`,
+	// Uncomment the following line if your bare application
+	// has an action associated with it:
+	// Run: func(cmd *cobra.Command, args []string) { },
+}
+
+// Execute adds all child commands to the root command and sets flags appropriately.
+// This is called by main.main(). It only needs to happen once to the rootCmd.
+func Execute() {
+	cobra.CheckErr(rootCmd.Execute())
+}
+
+func init() {
+	cobra.OnInitialize(initConfig)
+
+	// Here you will define your flags and configuration settings.
+	// Cobra supports persistent flags, which, if defined here,
+	// will be global for your application.
+
+	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.example_03.yaml)")
+
+	// Cobra also supports local flags, which will only run
+	// when this action is called directly.
+	rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}
+
+// initConfig reads in config file and ENV variables if set.
+func initConfig() {
+	if cfgFile != "" {
+		// Use config file from the flag.
+		viper.SetConfigFile(cfgFile)
+	} else {
+		// Find home directory.
+		home, err := homedir.Dir()
+		cobra.CheckErr(err)
+
+		// Search config in home directory with name ".example_03" (without extension).
+		viper.AddConfigPath(home)
+		viper.SetConfigName(".example_03")
+	}
+
+	viper.AutomaticEnv() // read in environment variables that match
+
+	// If a config file is found, read it in.
+	if err := viper.ReadInConfig(); err == nil {
+		fmt.Fprintln(os.Stderr, "Using config file:", viper.ConfigFileUsed())
+	}
+}
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_03/cmd/test.go b/LectureCodeExamples/cli/cobra/advanced/example_03/cmd/test.go
new file mode 100644
index 0000000..584daa2
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_03/cmd/test.go
@@ -0,0 +1,51 @@
+/*
+Copyright © 2021 NAME HERE <EMAIL ADDRESS>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+// testCmd represents the test command
+var testCmd = &cobra.Command{
+	Use:   "test",
+	Short: "A brief description of your command",
+	Long: `A longer description that spans multiple lines and likely contains examples
+and usage of using your command. For example:
+
+Cobra is a CLI library for Go that empowers applications.
+This application is a tool to generate the needed files
+to quickly create a Cobra application.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println("test called")
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(testCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// testCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// testCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_03/go.mod b/LectureCodeExamples/cli/cobra/advanced/example_03/go.mod
new file mode 100644
index 0000000..42af707
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_03/go.mod
@@ -0,0 +1,9 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/advanced/example_03
+
+go 1.15
+
+require (
+	github.com/mitchellh/go-homedir v1.1.0
+	github.com/spf13/cobra v1.1.3
+	github.com/spf13/viper v1.7.1
+)
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_03/go.sum b/LectureCodeExamples/cli/cobra/advanced/example_03/go.sum
new file mode 100644
index 0000000..8a7a0f8
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_03/go.sum
@@ -0,0 +1,301 @@
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diff --git a/LectureCodeExamples/cli/cobra/advanced/example_03/main.go b/LectureCodeExamples/cli/cobra/advanced/example_03/main.go
new file mode 100644
index 0000000..505fc9a
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_03/main.go
@@ -0,0 +1,22 @@
+/*
+Copyright © 2021 NAME HERE <EMAIL ADDRESS>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package main
+
+import "github.com/arasevic/savetheworldwithgo/15_cli/cobra/advanced/example_03/cmd"
+
+func main() {
+	cmd.Execute()
+}
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_04/go.mod b/LectureCodeExamples/cli/cobra/advanced/example_04/go.mod
new file mode 100644
index 0000000..ec5e4df
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_04/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/advanced/example_04
+
+go 1.15
+
+require github.com/spf13/cobra v1.1.3
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_04/go.sum b/LectureCodeExamples/cli/cobra/advanced/example_04/go.sum
new file mode 100644
index 0000000..05d85f7
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_04/go.sum
@@ -0,0 +1,303 @@
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diff --git a/LectureCodeExamples/cli/cobra/advanced/example_04/say.go b/LectureCodeExamples/cli/cobra/advanced/example_04/say.go
new file mode 100644
index 0000000..c79346b
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_04/say.go
@@ -0,0 +1,60 @@
+package main
+
+import (
+	"fmt"
+	"github.com/spf13/cobra"
+	"os"
+)
+
+var RootCmd = &cobra.Command{
+	Use: "say",
+	Long: "Root command",
+}
+
+var HelloCmd = &cobra.Command{
+	Use: "hello",
+	Short: "Say hello",
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println("Hello!!!")
+	},
+}
+
+var ByeCmd = &cobra.Command{
+	Use: "bye",
+	Short: "Say goodbye",
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println("Bye!!!")
+	},
+}
+
+var CompletionCmd = &cobra.Command{
+	Use:   "completion [bash|zsh|fish|powershell]",
+	Short: "Generate completion script",
+	Long: "To load completions",
+	DisableFlagsInUseLine: true,
+	ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
+	Args:                  cobra.ExactValidArgs(1),
+	Run: func(cmd *cobra.Command, args []string) {
+		switch args[0] {
+		case "bash":
+			cmd.Root().GenBashCompletion(os.Stdout)
+		case "zsh":
+			cmd.Root().GenZshCompletion(os.Stdout)
+		case "fish":
+			cmd.Root().GenFishCompletion(os.Stdout, true)
+		case "powershell":
+			cmd.Root().GenPowerShellCompletionWithDesc(os.Stdout)
+		}
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(HelloCmd,ByeCmd,CompletionCmd)
+}
+
+func main() {
+	if err := RootCmd.Execute(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_05/cmd/completion.go b/LectureCodeExamples/cli/cobra/advanced/example_05/cmd/completion.go
new file mode 100644
index 0000000..bd205ca
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_05/cmd/completion.go
@@ -0,0 +1,28 @@
+package cmd
+
+import (
+    "github.com/spf13/cobra"
+    "os"
+)
+
+var CompletionCmd = &cobra.Command{
+    Use:   "completion [bash|zsh|fish|powershell]",
+    Short: "Generate completion script",
+    Long: "To load completions",
+    DisableFlagsInUseLine: true,
+    ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
+    Args:                  cobra.ExactValidArgs(1),
+    Run: func(cmd *cobra.Command, args []string) {
+        switch args[0] {
+        case "bash":
+            cmd.Root().GenBashCompletion(os.Stdout)
+        case "zsh":
+            cmd.Root().GenZshCompletion(os.Stdout)
+        case "fish":
+            cmd.Root().GenFishCompletion(os.Stdout, true)
+        case "powershell":
+            cmd.Root().GenPowerShellCompletionWithDesc(os.Stdout)
+        }
+    },
+}
+
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_05/db.go b/LectureCodeExamples/cli/cobra/advanced/example_05/db.go
new file mode 100644
index 0000000..cd7f941
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_05/db.go
@@ -0,0 +1,44 @@
+package main
+
+import (
+	"fmt"
+	"github.com/arasevic/savetheworldwithgo/15_cli/cobra/advanced/example_05/cmd"
+	"github.com/spf13/cobra"
+	"os"
+	"math/rand"
+	"time"
+)
+
+var RootCmd = &cobra.Command{
+	Use: "db",
+	Long: "Root command",
+}
+
+var GetCmd = &cobra.Command{
+	Use: "get",
+	Short: "Get user data",
+	Args: cobra.ExactValidArgs(1),
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Printf("Get user %s!!!\n",args[0])
+	},
+	ValidArgsFunction: UserGet,
+}
+
+func UserGet (cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+	rand.Seed(time.Now().UnixNano())
+	if rand.Int() % 2 == 0 {
+		return []string{"John", "Mary"}, cobra.ShellCompDirectiveNoFileComp
+	}
+	return []string{"Ernest", "Rick", "Mary"}, cobra.ShellCompDirectiveNoFileComp
+}
+
+func init() {
+	RootCmd.AddCommand(GetCmd, cmd.CompletionCmd)
+}
+
+func main() {
+	if err := RootCmd.Execute(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_05/go.mod b/LectureCodeExamples/cli/cobra/advanced/example_05/go.mod
new file mode 100644
index 0000000..52e785e
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_05/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/advanced/example_05
+
+go 1.15
+
+require github.com/spf13/cobra v1.1.3
diff --git a/LectureCodeExamples/cli/cobra/advanced/example_05/go.sum b/LectureCodeExamples/cli/cobra/advanced/example_05/go.sum
new file mode 100644
index 0000000..05d85f7
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/advanced/example_05/go.sum
@@ -0,0 +1,303 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
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diff --git a/LectureCodeExamples/cli/cobra/basics/example_01/go.mod b/LectureCodeExamples/cli/cobra/basics/example_01/go.mod
new file mode 100644
index 0000000..e62f0bb
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/basics/example_01/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/basics/example_01
+
+go 1.15
+
+require github.com/spf13/cobra v1.1.3
diff --git a/LectureCodeExamples/cli/cobra/basics/example_01/go.sum b/LectureCodeExamples/cli/cobra/basics/example_01/go.sum
new file mode 100644
index 0000000..a759029
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/basics/example_01/go.sum
@@ -0,0 +1,286 @@
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diff --git a/LectureCodeExamples/cli/cobra/basics/example_01/hello.go b/LectureCodeExamples/cli/cobra/basics/example_01/hello.go
new file mode 100644
index 0000000..be18817
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/basics/example_01/hello.go
@@ -0,0 +1,25 @@
+package main
+
+import (
+    "fmt"
+    "github.com/spf13/cobra"
+    "os"
+)
+
+var RootCmd = &cobra.Command{
+    Use: "hello",
+    Short: "short message",
+    Long: "Long message",
+    Version: "v0.1.0",
+    Example: "this is an example",
+    Run: func(cmd *cobra.Command, args []string) {
+        fmt.Println("Save the world with Go!!!")
+    },
+}
+
+func main() {
+    if err := RootCmd.Execute(); err != nil {
+        fmt.Fprintln(os.Stderr, err)
+        os.Exit(1)
+    }
+}
diff --git a/LectureCodeExamples/cli/cobra/commands/example_01/go.mod b/LectureCodeExamples/cli/cobra/commands/example_01/go.mod
new file mode 100644
index 0000000..0a2f62b
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/commands/example_01/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/example_01
+
+go 1.15
+
+require github.com/spf13/cobra v1.1.3 // indirect
diff --git a/LectureCodeExamples/cli/cobra/commands/example_01/go.sum b/LectureCodeExamples/cli/cobra/commands/example_01/go.sum
new file mode 100644
index 0000000..6b8821f
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/commands/example_01/go.sum
@@ -0,0 +1,299 @@
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diff --git a/LectureCodeExamples/cli/cobra/commands/example_01/say.go b/LectureCodeExamples/cli/cobra/commands/example_01/say.go
new file mode 100644
index 0000000..d4f00d4
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/commands/example_01/say.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+    "fmt"
+    "github.com/spf13/cobra"
+    "os"
+)
+
+var RootCmd = &cobra.Command{
+    Use: "say",
+    Long: "Root command",
+}
+
+var HelloCmd = &cobra.Command{
+    Use: "hello",
+    Short: "Say hello",
+    Run: func(cmd *cobra.Command, args []string) {
+        fmt.Println("Hello!!!")
+    },
+}
+
+var ByeCmd = &cobra.Command{
+    Use: "bye",
+    Short: "Say goodbye",
+    Run: func(cmd *cobra.Command, args []string) {
+        fmt.Println("Bye!!!")
+    },
+}
+
+func init() {
+    RootCmd.AddCommand(HelloCmd, ByeCmd)
+}
+
+func main() {
+    if err := RootCmd.Execute(); err != nil {
+        fmt.Fprintln(os.Stderr, err)
+        os.Exit(1)
+    }
+}
diff --git a/LectureCodeExamples/cli/cobra/commands/example_02/go.mod b/LectureCodeExamples/cli/cobra/commands/example_02/go.mod
new file mode 100644
index 0000000..66a2bcf
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/commands/example_02/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/commands/example_02
+
+go 1.15
+
+require github.com/spf13/cobra v1.1.3 // indirect
diff --git a/LectureCodeExamples/cli/cobra/commands/example_02/go.sum b/LectureCodeExamples/cli/cobra/commands/example_02/go.sum
new file mode 100644
index 0000000..6b8821f
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/commands/example_02/go.sum
@@ -0,0 +1,299 @@
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diff --git a/LectureCodeExamples/cli/cobra/commands/example_02/say.go b/LectureCodeExamples/cli/cobra/commands/example_02/say.go
new file mode 100644
index 0000000..f3fe3b2
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/commands/example_02/say.go
@@ -0,0 +1,53 @@
+package main
+
+import (
+    "fmt"
+    "github.com/spf13/cobra"
+    "os"
+)
+
+var RootCmd = &cobra.Command{
+    Use: "say",
+    Long: "Root command",
+}
+
+var HelloCmd = &cobra.Command{
+    Use: "hello",
+    Short: "Say hello",
+    Run: func(cmd *cobra.Command, args []string) {
+        fmt.Printf("Hello %s!!!\n",person)
+    },
+}
+
+var ByeCmd = &cobra.Command{
+    Use: "bye",
+    Short: "Say goodbye",
+    Run: func(cmd *cobra.Command, args []string) {
+        fmt.Printf("Bye %s!!!\n",person)
+    },
+}
+
+var CustomCmd = &cobra.Command{
+    Use: "custom",
+    Short: "Custom greetings",
+    Run: func(cmd *cobra.Command, args []string) {
+        fmt.Printf("Say %s to %s\n",msg,person)
+    },
+}
+
+var msg string
+var person string
+
+func init() {
+    RootCmd.AddCommand(HelloCmd, ByeCmd, CustomCmd)
+
+    RootCmd.PersistentFlags().StringVar(&person, "person", "Mr X", "Receiver")
+    CustomCmd.Flags().StringVar(&msg,"msg","what's up","Custom message")
+}
+
+func main() {
+    if err := RootCmd.Execute(); err != nil {
+        fmt.Fprintln(os.Stderr, err)
+        os.Exit(1)
+    }
+}
diff --git a/LectureCodeExamples/cli/cobra/commands/example_03/go.mod b/LectureCodeExamples/cli/cobra/commands/example_03/go.mod
new file mode 100644
index 0000000..12420da
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/commands/example_03/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/commands/example_03
+
+go 1.15
+
+require github.com/spf13/cobra v1.1.3 // indirect
diff --git a/LectureCodeExamples/cli/cobra/commands/example_03/go.sum b/LectureCodeExamples/cli/cobra/commands/example_03/go.sum
new file mode 100644
index 0000000..037bdb8
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/commands/example_03/go.sum
@@ -0,0 +1,300 @@
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+cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
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diff --git a/LectureCodeExamples/cli/cobra/commands/example_03/say.go b/LectureCodeExamples/cli/cobra/commands/example_03/say.go
new file mode 100644
index 0000000..3e05a48
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/commands/example_03/say.go
@@ -0,0 +1,47 @@
+package main
+
+import (
+    "fmt"
+    "github.com/spf13/cobra"
+    "os"
+)
+
+var RootCmd = &cobra.Command{
+    Use: "say",
+    Long: "Root command",
+    PersistentPreRun: func(cmd *cobra.Command, args []string) {
+        fmt.Printf("Hello %s!!!\n", person)
+    },
+    Run: func(cmd *cobra.Command, args []string) {},
+    PostRun: func(cmd *cobra.Command, args []string) {
+        fmt.Printf("Bye %s!!!\n", person)
+    },
+}
+
+var SomethingCmd = &cobra.Command{
+    Use: "something",
+    Short: "Say something",
+    Run: func(cmd *cobra.Command, args []string) {
+        fmt.Printf("%s\n",msg)
+    },
+    PostRun: func(cmd *cobra.Command, args []string) {
+        fmt.Printf("That's all I have to say %s\n", person)
+    },
+}
+
+var person string
+var msg string
+
+func init() {
+    RootCmd.AddCommand(SomethingCmd)
+    RootCmd.Flags().StringVar(&person, "person", "Mr X", "Receiver")
+    SomethingCmd.Flags().StringVar(&msg, "msg", "", "Message to say")
+    SomethingCmd.MarkFlagRequired("msg")
+}
+
+func main() {
+    if err := RootCmd.Execute(); err != nil {
+        fmt.Fprintln(os.Stderr, err)
+        os.Exit(1)
+    }
+}
diff --git a/LectureCodeExamples/cli/cobra/flags/example_01/go.mod b/LectureCodeExamples/cli/cobra/flags/example_01/go.mod
new file mode 100644
index 0000000..f339ed6
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_01/go.mod
@@ -0,0 +1,3 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/flags/example_01
+
+go 1.15
diff --git a/LectureCodeExamples/cli/cobra/flags/example_01/go.sum b/LectureCodeExamples/cli/cobra/flags/example_01/go.sum
new file mode 100644
index 0000000..381fa9a
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_01/go.sum
@@ -0,0 +1,285 @@
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diff --git a/LectureCodeExamples/cli/cobra/flags/example_01/main.go b/LectureCodeExamples/cli/cobra/flags/example_01/main.go
new file mode 100644
index 0000000..2e21ec6
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_01/main.go
@@ -0,0 +1,23 @@
+package main
+
+import (
+    "fmt"
+    "github.com/spf13/cobra"
+    "os"
+    "strings"
+)
+
+var RootCmd = &cobra.Command{
+    Use: "main",
+    Long: "Long message",
+    Run: func(cmd *cobra.Command, args []string) {
+        fmt.Printf("%s\n",strings.Join(args,","))
+    },
+}
+
+func main() {
+    if err := RootCmd.Execute(); err != nil {
+        fmt.Fprintln(os.Stderr, err)
+        os.Exit(1)
+    }
+}
diff --git a/LectureCodeExamples/cli/cobra/flags/example_02/go.mod b/LectureCodeExamples/cli/cobra/flags/example_02/go.mod
new file mode 100644
index 0000000..aa22fb7
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_02/go.mod
@@ -0,0 +1,3 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/flags/example_02
+
+go 1.15
diff --git a/LectureCodeExamples/cli/cobra/flags/example_02/go.sum b/LectureCodeExamples/cli/cobra/flags/example_02/go.sum
new file mode 100644
index 0000000..6b8821f
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_02/go.sum
@@ -0,0 +1,299 @@
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diff --git a/LectureCodeExamples/cli/cobra/flags/example_02/main.go b/LectureCodeExamples/cli/cobra/flags/example_02/main.go
new file mode 100644
index 0000000..0c9fd7b
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_02/main.go
@@ -0,0 +1,29 @@
+package main
+
+import (
+    "fmt"
+    "github.com/spf13/cobra"
+    "os"
+)
+
+var RootCmd = &cobra.Command{
+    Use: "main",
+    Long: "Long message",
+    Run: func(cmd *cobra.Command, args []string) {
+        fmt.Printf("[[--%s--]]\n", *Msg)
+    },
+}
+
+var Msg *string
+
+func init() {
+    Msg = RootCmd.Flags().String("msg", "Save the world with Go!!!",
+        "Message to show")
+}
+
+func main() {
+    if err := RootCmd.Execute(); err != nil {
+        fmt.Fprintln(os.Stderr, err)
+        os.Exit(1)
+    }
+}
diff --git a/LectureCodeExamples/cli/cobra/flags/example_03/go.mod b/LectureCodeExamples/cli/cobra/flags/example_03/go.mod
new file mode 100644
index 0000000..71b27a8
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_03/go.mod
@@ -0,0 +1,3 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/flags/example_03
+
+go 1.15
diff --git a/LectureCodeExamples/cli/cobra/flags/example_03/go.sum b/LectureCodeExamples/cli/cobra/flags/example_03/go.sum
new file mode 100644
index 0000000..6b8821f
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_03/go.sum
@@ -0,0 +1,299 @@
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diff --git a/LectureCodeExamples/cli/cobra/flags/example_03/main.go b/LectureCodeExamples/cli/cobra/flags/example_03/main.go
new file mode 100644
index 0000000..a4e575d
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_03/main.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+    "fmt"
+    "github.com/spf13/cobra"
+    "os"
+)
+
+var RootCmd = &cobra.Command{
+    Use: "main",
+    Long: "Long message",
+    Run: func(cmd *cobra.Command, args []string) {
+        for i:=0;i<*Rep;i++ {
+            fmt.Printf("[[--%s--]]\n", *Msg)
+        }
+    },
+}
+
+var Msg *string
+var Rep *int
+
+func init() {
+    Msg = RootCmd.Flags().String("msg", "Save the world with Go!!!",
+        "Message to show")
+    Rep = RootCmd.Flags().Int("rep",1, "Number of times to show the message")
+}
+
+func main() {
+    if err := RootCmd.Execute(); err != nil {
+        fmt.Fprintln(os.Stderr, err)
+        os.Exit(1)
+    }
+}
diff --git a/LectureCodeExamples/cli/cobra/flags/example_04/go.mod b/LectureCodeExamples/cli/cobra/flags/example_04/go.mod
new file mode 100644
index 0000000..0a2f62b
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_04/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/example_01
+
+go 1.15
+
+require github.com/spf13/cobra v1.1.3 // indirect
diff --git a/LectureCodeExamples/cli/cobra/flags/example_04/go.sum b/LectureCodeExamples/cli/cobra/flags/example_04/go.sum
new file mode 100644
index 0000000..6b8821f
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_04/go.sum
@@ -0,0 +1,299 @@
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diff --git a/LectureCodeExamples/cli/cobra/flags/example_04/main.go b/LectureCodeExamples/cli/cobra/flags/example_04/main.go
new file mode 100644
index 0000000..f6b34c1
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_04/main.go
@@ -0,0 +1,35 @@
+package main
+
+import (
+    "fmt"
+    "github.com/spf13/cobra"
+    "os"
+)
+
+var RootCmd = &cobra.Command{
+    Use: "main",
+    Long: "Long message",
+    Run: func(cmd *cobra.Command, args []string) {
+        for i:=0;i<*Rep;i++ {
+            fmt.Printf("[[--%s--]]\n", *Msg)
+        }
+    },
+}
+
+var Msg *string
+var Rep *int
+
+func init() {
+    Msg = RootCmd.Flags().String("msg", "Save the world with Go!!!",
+        "Message to show")
+    Rep = RootCmd.Flags().Int("rep",1, "Number of times to show the message")
+
+    RootCmd.MarkFlagRequired("rep")
+}
+
+func main() {
+    if err := RootCmd.Execute(); err != nil {
+        fmt.Fprintln(os.Stderr, err)
+        os.Exit(1)
+    }
+}
diff --git a/LectureCodeExamples/cli/cobra/flags/example_05/go.mod b/LectureCodeExamples/cli/cobra/flags/example_05/go.mod
new file mode 100644
index 0000000..0a2f62b
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_05/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/15_cli/cobra/example_01
+
+go 1.15
+
+require github.com/spf13/cobra v1.1.3 // indirect
diff --git a/LectureCodeExamples/cli/cobra/flags/example_05/go.sum b/LectureCodeExamples/cli/cobra/flags/example_05/go.sum
new file mode 100644
index 0000000..6b8821f
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_05/go.sum
@@ -0,0 +1,299 @@
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diff --git a/LectureCodeExamples/cli/cobra/flags/example_05/main.go b/LectureCodeExamples/cli/cobra/flags/example_05/main.go
new file mode 100644
index 0000000..4d5dcbd
--- /dev/null
+++ b/LectureCodeExamples/cli/cobra/flags/example_05/main.go
@@ -0,0 +1,36 @@
+package main
+
+import (
+    "fmt"
+    "github.com/spf13/cobra"
+    "os"
+)
+
+var RootCmd = &cobra.Command{
+    Use: "main",
+    Short: "short message",
+    Run: func(cmd *cobra.Command, args []string) {
+        for i:=0;i<cnfg.Rep;i++ {
+            fmt.Printf("[[--%s--]]\n", cnfg.Msg)
+        }
+    },
+}
+
+type Config struct {
+    Msg string
+    Rep int
+}
+var cnfg Config = Config{}
+
+func init() {
+    RootCmd.Flags().StringVar(&cnfg.Msg, "msg","Save the world with Go!!!","Message to show")
+    RootCmd.Flags().IntVar(&cnfg.Rep,"rep",1, "Number of times to show the message")
+    RootCmd.MarkFlagRequired("rep")
+}
+
+func main() {
+    if err := RootCmd.Execute(); err != nil {
+        fmt.Fprintln(os.Stderr, err)
+        os.Exit(1)
+    }
+}
diff --git a/LectureCodeExamples/kafka/README.md b/LectureCodeExamples/kafka/README.md
new file mode 100644
index 0000000..f3f9961
--- /dev/null
+++ b/LectureCodeExamples/kafka/README.md
@@ -0,0 +1,28 @@
+# Kafka
+
+These examples assume Kafka instance is running and it is  available at 
+`localhost:9092`. You can follow the 
+the [official guide](https://docs.confluent.io/platform/current/quickstart/ce-docker-quickstart.html#ce-docker-quickstart) 
+to have a basic Kafka deployment in containers.
+
+A minimal Docker compose file is provided here. Notice that only the services
+required by the examples are deployed in the provided Docker compose file. To
+start the environment run:
+
+```
+docker-compose up -d
+```
+
+This will start the containers and check all the dependencies. All the containers
+must be up and ready to have a working environment. In order to check that 
+everything is ready you can run:
+```
+docker ps
+CONTAINER ID   IMAGE                                   COMMAND                  CREATED        STATUS       PORTS                                            NAMES
+32155ffabe37   confluentinc/cp-kafka-rest:6.1.0        "/etc/confluent/dock…"   18 hours ago   Up 4 hours   0.0.0.0:8082->8082/tcp                           rest-proxy
+3bb8cfafd9ee   confluentinc/cp-schema-registry:6.1.0   "/etc/confluent/dock…"   18 hours ago   Up 4 hours   0.0.0.0:8081->8081/tcp                           schema-registry
+344a9836ad27   confluentinc/cp-server:6.1.0            "/etc/confluent/dock…"   18 hours ago   Up 4 hours   0.0.0.0:9092->9092/tcp, 0.0.0.0:9101->9101/tcp   broker
+5458ec512452   confluentinc/cp-zookeeper:6.1.0         "/etc/confluent/dock…"   18 hours ago   Up 4 hours   2888/tcp, 0.0.0.0:2181->2181/tcp, 3888/tcp       zookeeper
+```
+
+If you have any trouble with this procedure, refer to the official documentation.
diff --git a/LectureCodeExamples/kafka/confluent/example_01/consumer.go b/LectureCodeExamples/kafka/confluent/example_01/consumer.go
new file mode 100644
index 0000000..8ad4470
--- /dev/null
+++ b/LectureCodeExamples/kafka/confluent/example_01/consumer.go
@@ -0,0 +1,35 @@
+package main
+
+import (
+    "fmt"
+    "github.com/confluentinc/confluent-kafka-go/kafka"
+)
+
+func main() {
+    c, err := kafka.NewConsumer(&kafka.ConfigMap{
+        "bootstrap.servers": "localhost:9092",
+        "group.id":          "helloGroup",
+        "auto.offset.reset": "earliest",
+    })
+    if err != nil {
+        panic(err)
+    }
+    defer c.Close()
+
+    c.Subscribe("helloTopic", nil)
+    for {
+        ev := c.Poll(1000)
+        switch e := ev.(type) {
+        case *kafka.Message:
+            c.Commit()
+            fmt.Printf("Msg on %s: %s\n", e.TopicPartition, string(e.Value))
+        case kafka.PartitionEOF:
+            fmt.Printf("%v\n",e)
+        case kafka.Error:
+            fmt.Printf("Error: %v\n", e)
+            break
+        default:
+            fmt.Printf("Ignored: %v\n",e)
+        }
+    }
+}
diff --git a/LectureCodeExamples/kafka/confluent/example_01/go.mod b/LectureCodeExamples/kafka/confluent/example_01/go.mod
new file mode 100644
index 0000000..9786745
--- /dev/null
+++ b/LectureCodeExamples/kafka/confluent/example_01/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/18_kafka/confluent/example_01
+
+go 1.15
+
+require github.com/confluentinc/confluent-kafka-go v1.5.2
diff --git a/LectureCodeExamples/kafka/confluent/example_01/go.sum b/LectureCodeExamples/kafka/confluent/example_01/go.sum
new file mode 100644
index 0000000..9a68628
--- /dev/null
+++ b/LectureCodeExamples/kafka/confluent/example_01/go.sum
@@ -0,0 +1,2 @@
+github.com/confluentinc/confluent-kafka-go v1.5.2 h1:l+qt+a0Okmq0Bdr1P55IX4fiwFJyg0lZQmfHkAFkv7E=
+github.com/confluentinc/confluent-kafka-go v1.5.2/go.mod h1:u2zNLny2xq+5rWeTQjFHbDzzNuba4P1vo31r9r4uAdg=
diff --git a/LectureCodeExamples/kafka/confluent/example_01/producer.go b/LectureCodeExamples/kafka/confluent/example_01/producer.go
new file mode 100644
index 0000000..5d133ae
--- /dev/null
+++ b/LectureCodeExamples/kafka/confluent/example_01/producer.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+    "fmt"
+    "github.com/confluentinc/confluent-kafka-go/kafka"
+)
+
+func main() {
+    cfg := kafka.ConfigMap{"bootstrap.servers": "localhost:9092"}
+    p, err := kafka.NewProducer(&cfg)
+    if err != nil {
+        panic(err)
+    }
+    defer p.Close()
+
+    deliveryChan := make(chan kafka.Event,10)
+    defer close(deliveryChan)
+    topic := "helloTopic"
+    msgs := []string{"Save", "the", "world", "with", "Go!!!"}
+    for _, word := range msgs {
+        err = p.Produce(&kafka.Message{
+            TopicPartition: kafka.TopicPartition{Topic: &topic, Partition: kafka.PartitionAny},
+            Value: []byte(word),
+        }, deliveryChan)
+        if err != nil {
+            panic(err)
+        }
+        e := <-deliveryChan
+        m := e.(*kafka.Message)
+        fmt.Printf("Sent %v\n",m)
+    }
+    // p.Flush(1000)
+}
diff --git a/LectureCodeExamples/kafka/confluent/example_02/consumer.go b/LectureCodeExamples/kafka/confluent/example_02/consumer.go
new file mode 100644
index 0000000..d6a4e31
--- /dev/null
+++ b/LectureCodeExamples/kafka/confluent/example_02/consumer.go
@@ -0,0 +1,51 @@
+package main
+
+import (
+    "fmt"
+    "github.com/confluentinc/confluent-kafka-go/kafka"
+)
+
+const COMMIT_N = 2
+
+func Committer(c *kafka.Consumer) {
+    offsets, err := c.Commit()
+    if err != nil {
+        fmt.Printf("Error: %s\n", err)
+        return
+    }
+    fmt.Printf("Offset: %#v\n",offsets[0].String())
+}
+
+func main() {
+
+    c, err := kafka.NewConsumer(&kafka.ConfigMap{
+        "bootstrap.servers": "localhost:9092",
+        "group.id":          "helloGroup",
+        "auto.offset.reset": "earliest",
+    })
+    if err != nil {
+        panic(err)
+    }
+    defer c.Close()
+
+    c.Subscribe("helloTopic", nil)
+    counter := 0
+    for {
+        ev := c.Poll(1000)
+        switch e := ev.(type) {
+        case *kafka.Message:
+            counter += 1
+            if counter % COMMIT_N == 0 {
+                go Committer(c)
+            }
+            fmt.Printf("Msg on %s: %s\n", e.TopicPartition, string(e.Value))
+        case kafka.PartitionEOF:
+            fmt.Printf("%v\n",e)
+        case kafka.Error:
+            fmt.Printf("Error: %v\n", e)
+            break
+        default:
+            fmt.Printf("Ignored: %v\n",e)
+        }
+    }
+}
diff --git a/LectureCodeExamples/kafka/confluent/example_02/go.mod b/LectureCodeExamples/kafka/confluent/example_02/go.mod
new file mode 100644
index 0000000..30cf76b
--- /dev/null
+++ b/LectureCodeExamples/kafka/confluent/example_02/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/18_kafka/confluent/example_02
+
+go 1.15
+
+require github.com/confluentinc/confluent-kafka-go v1.5.2 // indirect
diff --git a/LectureCodeExamples/kafka/confluent/example_02/go.sum b/LectureCodeExamples/kafka/confluent/example_02/go.sum
new file mode 100644
index 0000000..9a68628
--- /dev/null
+++ b/LectureCodeExamples/kafka/confluent/example_02/go.sum
@@ -0,0 +1,2 @@
+github.com/confluentinc/confluent-kafka-go v1.5.2 h1:l+qt+a0Okmq0Bdr1P55IX4fiwFJyg0lZQmfHkAFkv7E=
+github.com/confluentinc/confluent-kafka-go v1.5.2/go.mod h1:u2zNLny2xq+5rWeTQjFHbDzzNuba4P1vo31r9r4uAdg=
diff --git a/LectureCodeExamples/kafka/confluent/example_02/producer.go b/LectureCodeExamples/kafka/confluent/example_02/producer.go
new file mode 100644
index 0000000..5f3cd30
--- /dev/null
+++ b/LectureCodeExamples/kafka/confluent/example_02/producer.go
@@ -0,0 +1,44 @@
+package main
+
+import (
+    "fmt"
+    "github.com/confluentinc/confluent-kafka-go/kafka"
+)
+
+func Handler(c chan kafka.Event) {
+    for {
+        e := <- c
+        if e == nil {
+            return
+        }
+        m := e.(*kafka.Message)
+        if m.TopicPartition.Error != nil {
+            fmt.Printf("Partition error %s\n",m.TopicPartition.Error)
+        } else {
+            fmt.Printf("Sent %v: %s\n",m,string(m.Value))
+        }
+    }
+}
+
+func main() {
+    cfg := kafka.ConfigMap{"bootstrap.servers": "localhost:9092"}
+    p, err := kafka.NewProducer(&cfg)
+    if err != nil {
+        panic(err)
+    }
+    defer p.Close()
+
+    delivery_chan := make(chan kafka.Event,10)
+    defer close(delivery_chan)
+    go Handler(delivery_chan)
+
+    topic := "helloTopic"
+    msgs := []string{"Save", "the", "world", "with", "Go!!!"}
+    for _, word := range msgs {
+        err = p.Produce(&kafka.Message{
+            TopicPartition: kafka.TopicPartition{Topic: &topic, Partition: kafka.PartitionAny},
+            Value: []byte(word),
+        },delivery_chan)
+    }
+    p.Flush(10000)
+}
diff --git a/LectureCodeExamples/kafka/confluent/example_02a/consumer.go b/LectureCodeExamples/kafka/confluent/example_02a/consumer.go
new file mode 100644
index 0000000..b46e4e9
--- /dev/null
+++ b/LectureCodeExamples/kafka/confluent/example_02a/consumer.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+    "fmt"
+    "gopkg.in/confluentinc/confluent-kafka-go.v1/kafka"
+    "encoding/json"
+)
+
+type User struct {
+    Name string `json:"name"`
+    Email string `json:"email"`
+}
+
+func main() {
+
+    c, err := kafka.NewConsumer(&kafka.ConfigMap{
+        "bootstrap.servers": "localhost",
+        "group.id":          "userGroup",
+        "auto.offset.reset": "earliest",
+    })
+    if err != nil {
+        panic(err)
+    }
+    defer c.Close()
+
+    c.Subscribe("userTopic", nil)
+    for {
+
+        msg, err := c.ReadMessage(-1)
+        if err != nil {
+            fmt.Printf("Consumer error: #{err} (#{msg}\n)")
+        }
+        var u User
+        err = json.Unmarshal(msg.Value, &u)
+        if err == nil {
+            fmt.Printf("Message on %s: %s\n", msg.TopicPartition, u)
+        } else {
+            // The client will automatically try to recover from all errors.
+            fmt.Printf("Consumer error: %v (%v)\n", err, msg)
+        }
+    }
+}
diff --git a/LectureCodeExamples/kafka/confluent/example_02a/producer.go b/LectureCodeExamples/kafka/confluent/example_02a/producer.go
new file mode 100644
index 0000000..f1ee5df
--- /dev/null
+++ b/LectureCodeExamples/kafka/confluent/example_02a/producer.go
@@ -0,0 +1,34 @@
+package main
+
+import (
+    "encoding/json"
+    "gopkg.in/confluentinc/confluent-kafka-go.v1/kafka"
+)
+
+type User struct {
+    Name string `json:"name"`
+    Email string `json:"email"`
+}
+
+func main() {
+    cfg := kafka.ConfigMap{"bootstrap.servers": "localhost"}
+    p, err := kafka.NewProducer(&cfg)
+    if err != nil {
+        panic(err)
+    }
+    defer p.Close()
+
+    topic := "userTopic"
+    users := []User{{"John", "john@gmail.com"},{"Mary", "mary@email.com"}}
+    for _, u := range users {
+        encoded, err := json.Marshal(u)
+        if err != nil {
+            panic(err)
+        }
+        p.Produce(&kafka.Message{
+            TopicPartition: kafka.TopicPartition{Topic: &topic, Partition: kafka.PartitionAny},
+            Value: encoded,
+        },nil)
+    }
+    p.Flush(1000)
+}
diff --git a/LectureCodeExamples/kafka/docker-compose.yml b/LectureCodeExamples/kafka/docker-compose.yml
new file mode 100644
index 0000000..d66ef8c
--- /dev/null
+++ b/LectureCodeExamples/kafka/docker-compose.yml
@@ -0,0 +1,70 @@
+---
+version: '2'
+services:
+  zookeeper:
+    image: confluentinc/cp-zookeeper:6.1.0
+    hostname: zookeeper
+    container_name: zookeeper
+    ports:
+      - "2181:2181"
+    environment:
+      ZOOKEEPER_CLIENT_PORT: 2181
+      ZOOKEEPER_TICK_TIME: 2000
+
+  broker:
+    image: confluentinc/cp-server:6.1.0
+    hostname: broker
+    container_name: broker
+    depends_on:
+      - zookeeper
+    ports:
+      - "9092:9092"
+      - "9101:9101"
+    environment:
+      KAFKA_BROKER_ID: 1
+      KAFKA_ZOOKEEPER_CONNECT: 'zookeeper:2181'
+      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
+      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://broker:29092,PLAINTEXT_HOST://localhost:9092
+      KAFKA_METRIC_REPORTERS: io.confluent.metrics.reporter.ConfluentMetricsReporter
+      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
+      KAFKA_GROUP_INITIAL_REBALANCE_DELAY_MS: 0
+      KAFKA_CONFLUENT_LICENSE_TOPIC_REPLICATION_FACTOR: 1
+      KAFKA_CONFLUENT_BALANCER_TOPIC_REPLICATION_FACTOR: 1
+      KAFKA_DELETE_RETENTION_MS: 2000
+      KAFKA_TRANSACTION_STATE_LOG_MIN_ISR: 1
+      KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR: 1
+      KAFKA_JMX_PORT: 9101
+      KAFKA_JMX_HOSTNAME: localhost
+      KAFKA_CONFLUENT_SCHEMA_REGISTRY_URL: http://schema-registry:8081
+      CONFLUENT_METRICS_REPORTER_BOOTSTRAP_SERVERS: broker:29092
+      CONFLUENT_METRICS_REPORTER_TOPIC_REPLICAS: 1
+      CONFLUENT_METRICS_ENABLE: 'true'
+      CONFLUENT_SUPPORT_CUSTOMER_ID: 'anonymous'
+
+  schema-registry:
+    image: confluentinc/cp-schema-registry:6.1.0
+    hostname: schema-registry
+    container_name: schema-registry
+    depends_on:
+      - broker
+    ports:
+      - "8081:8081"
+    environment:
+      SCHEMA_REGISTRY_HOST_NAME: schema-registry
+      SCHEMA_REGISTRY_KAFKASTORE_BOOTSTRAP_SERVERS: 'broker:29092'
+      SCHEMA_REGISTRY_LISTENERS: http://0.0.0.0:8081
+
+  rest-proxy:
+    image: confluentinc/cp-kafka-rest:6.1.0
+    depends_on:
+      - broker
+      - schema-registry
+    ports:
+      - 8082:8082
+    hostname: rest-proxy
+    container_name: rest-proxy
+    environment:
+      KAFKA_REST_HOST_NAME: rest-proxy
+      KAFKA_REST_BOOTSTRAP_SERVERS: 'broker:29092'
+      KAFKA_REST_LISTENERS: "http://0.0.0.0:8082"
+      KAFKA_REST_SCHEMA_REGISTRY_URL: 'http://schema-registry:8081'
diff --git a/LectureCodeExamples/kafka/rest/example_01/consumer.go b/LectureCodeExamples/kafka/rest/example_01/consumer.go
new file mode 100644
index 0000000..b1eb7f4
--- /dev/null
+++ b/LectureCodeExamples/kafka/rest/example_01/consumer.go
@@ -0,0 +1,89 @@
+package main
+
+import (
+    "bufio"
+    "bytes"
+    "time"
+    "fmt"
+    "net/http"
+)
+
+const (
+    HOST           = "http://localhost:8082"
+    CONSUMER       = "testConsumer"
+    GROUP          = "testGroup"
+	NEW_CONSUMER   = "%s/consumers/%s"
+    SUBSCRIBE_CONSUMER = "%s/consumers/%s/instances/%s/subscription"
+	FETCH_CONSUMER = "%s/consumers/%s/instances/%s/records"
+	DELETE_CONSUMER = "%s/consumers/%s/instances/%s"
+    CONTENT_TYPE   = "application/vnd.kafka.json.v2+json"
+)
+
+func DoHelper(client *http.Client, url string, body []byte ) error {
+    bufferBody := bytes.NewBuffer(body)
+    req, err := http.NewRequest(http.MethodPost,url, bufferBody)
+    if err != nil {
+        return err
+    }
+    fmt.Printf("-->Call %s\n",req.URL)
+    fmt.Printf("-->Body %s\n",string(body))
+    resp, err := client.Do(req)
+    if err != nil {
+        return err
+    }
+    defer resp.Body.Close()
+    bodyResp := bufio.NewScanner(resp.Body)
+    fmt.Printf("<--Response %s\n", resp.Status)
+    for bodyResp.Scan() {
+        fmt.Printf("<--Body %s\n",bodyResp.Text())
+    }
+    return nil
+}
+
+func main() {
+    client := http.Client{}
+    // New consumer
+    url := fmt.Sprintf(NEW_CONSUMER,HOST,GROUP)
+    body := fmt.Sprintf(`{"name":"%s", "format": "json"}`,CONSUMER)
+    err := DoHelper(&client, url, []byte(body))
+    if err != nil {
+        panic(err)
+    }
+    time.Sleep(time.Second)
+    // Subscribe to topic
+    url = fmt.Sprintf(SUBSCRIBE_CONSUMER,HOST,GROUP,CONSUMER)
+    body = `{"topics":["helloTopic"]}`
+    err = DoHelper(&client, url, []byte(body))
+    if err != nil {
+        panic(err)
+    }
+    time.Sleep(time.Second)
+    // Get records
+    req, err := http.NewRequest(http.MethodGet, fmt.Sprintf(FETCH_CONSUMER,HOST,GROUP,CONSUMER), nil)
+    if err != nil {
+        panic(err)
+    }
+    req.Header.Add("Accept",CONTENT_TYPE)
+    fmt.Printf("-->Call %s\n",req.URL)
+    respRecords, err := client.Do(req)
+    if err != nil {
+        panic(err)
+    }
+    defer respRecords.Body.Close()
+    fmt.Printf("<--Response %s\n", respRecords.Status)
+    recordsBodyResp := bufio.NewScanner(respRecords.Body)
+    for recordsBodyResp.Scan() {
+        fmt.Printf("<--Body %s\n",recordsBodyResp.Text())
+    }
+    // Delete consumer instance
+    deleteReq, err := http.NewRequest(http.MethodDelete,fmt.Sprintf(DELETE_CONSUMER,HOST,GROUP,CONSUMER),nil)
+    if err != nil {
+        panic(err)
+    }
+    fmt.Printf("-->Call %s\n",deleteReq.URL)
+    resp, err := client.Do(deleteReq)
+    if err != nil {
+        panic(err)
+    }
+    fmt.Printf("<--Response %s\n",resp.Status)
+}
diff --git a/LectureCodeExamples/kafka/rest/example_01/go.mod b/LectureCodeExamples/kafka/rest/example_01/go.mod
new file mode 100644
index 0000000..0a6c9a2
--- /dev/null
+++ b/LectureCodeExamples/kafka/rest/example_01/go.mod
@@ -0,0 +1,3 @@
+module github.com/arasevic/savetheworldwithgo/18_kafka/rest/example_01
+
+go 1.15
diff --git a/LectureCodeExamples/kafka/rest/example_01/producer.go b/LectureCodeExamples/kafka/rest/example_01/producer.go
new file mode 100644
index 0000000..f67b5cb
--- /dev/null
+++ b/LectureCodeExamples/kafka/rest/example_01/producer.go
@@ -0,0 +1,52 @@
+package main
+
+import (
+    "bufio"
+    "bytes"
+    "encoding/json"
+    "fmt"
+    "net/http"
+    "strings"
+)
+
+const (
+	URL = "http://localhost:8082/topics/%s/partitions/%d"
+	CONTENT_TYPE = "application/vnd.kafka.json.v2+json"
+)
+
+type User struct{
+    Name string `json:"name"`
+    Email string `json:"email"`
+}
+
+func BuildBody (users []User) string {
+    values := make([]string,len(users))
+    for i, u := range users {
+        encoded, err := json.Marshal(&u)
+        if err != nil {
+            panic(err)
+        }
+        values[i] = fmt.Sprintf("{\"value\":%s}", encoded)
+    }
+    result := strings.Join(values,",")
+    return fmt.Sprintf("{\"records\": [%s]}", result)
+}
+
+func main() {
+    users := []User{{"John", "john@gmail.com"},{"Mary","mary@email.com"}}
+    body := BuildBody(users)
+    fmt.Println(body)
+    bufferBody := bytes.NewBuffer([]byte(body))
+
+    resp, err := http.Post(fmt.Sprintf(URL,"helloTopic",0),CONTENT_TYPE, bufferBody)
+    if err != nil {
+        panic(err)
+    }
+    defer resp.Body.Close()
+
+    fmt.Println(resp.Status)
+    bodyAnswer := bufio.NewScanner(resp.Body)
+    for bodyAnswer.Scan() {
+        fmt.Println(bodyAnswer.Text())
+    }
+}
diff --git a/LectureCodeExamples/kafka/segmentio/example_01/consumer.go b/LectureCodeExamples/kafka/segmentio/example_01/consumer.go
new file mode 100644
index 0000000..0a4ee2a
--- /dev/null
+++ b/LectureCodeExamples/kafka/segmentio/example_01/consumer.go
@@ -0,0 +1,32 @@
+package main
+
+import (
+    "context"
+    "fmt"
+    "github.com/segmentio/kafka-go"
+    "time"
+)
+
+func main() {
+    topic := "helloTopic"
+    partition := 0
+    conn, err := kafka.DialLeader(context.Background(),
+        "tcp", "localhost:9092",topic,partition)
+    if err != nil {
+        panic(err)
+    }
+
+    defer conn.Close()
+
+    conn.SetReadDeadline(time.Now().Add(time.Second))
+    batch := conn.ReadBatch(10e3, 10e6)
+    defer batch.Close()
+    for {
+        b := make([]byte, 10e3)
+        l, err := batch.Read(b)
+        if err != nil {
+            break
+        }
+        fmt.Printf("Received %d: %s\n",l,string(b))
+    }
+}
diff --git a/LectureCodeExamples/kafka/segmentio/example_01/go.mod b/LectureCodeExamples/kafka/segmentio/example_01/go.mod
new file mode 100644
index 0000000..d54322e
--- /dev/null
+++ b/LectureCodeExamples/kafka/segmentio/example_01/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/18_kafka/kafka-go/example_01
+
+go 1.15
+
+require github.com/segmentio/kafka-go v0.4.10 // indirect
diff --git a/LectureCodeExamples/kafka/segmentio/example_01/go.sum b/LectureCodeExamples/kafka/segmentio/example_01/go.sum
new file mode 100644
index 0000000..729b54b
--- /dev/null
+++ b/LectureCodeExamples/kafka/segmentio/example_01/go.sum
@@ -0,0 +1,23 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU=
+github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
+github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/klauspost/compress v1.9.8 h1:VMAMUUOh+gaxKTMk+zqbjsSjsIcUcL/LF4o63i82QyA=
+github.com/klauspost/compress v1.9.8/go.mod h1:RyIbtBH6LamlWaDj8nUwkbUhJ87Yi3uG0guNDohfE1A=
+github.com/pierrec/lz4 v2.0.5+incompatible h1:2xWsjqPFWcplujydGg4WmhC/6fZqK42wMM8aXeqhl0I=
+github.com/pierrec/lz4 v2.0.5+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/segmentio/kafka-go v0.4.10 h1:YnI820ZLfh710adINqwuCVtN3wbnLsLnT/+xhI0oooQ=
+github.com/segmentio/kafka-go v0.4.10/go.mod h1:BVDwBTF24avtlj4l8/xsWNb4papVeg16+jO6/0qjvhA=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/xdg/scram v0.0.0-20180814205039-7eeb5667e42c/go.mod h1:lB8K/P019DLNhemzwFU4jHLhdvlE6uDZjXFejJXr49I=
+github.com/xdg/stringprep v1.0.0/go.mod h1:Jhud4/sHMO4oL310DaZAKk9ZaJ08SJfe+sJh0HrGL1Y=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190506204251-e1dfcc566284/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/LectureCodeExamples/kafka/segmentio/example_01/producer.go b/LectureCodeExamples/kafka/segmentio/example_01/producer.go
new file mode 100644
index 0000000..551969b
--- /dev/null
+++ b/LectureCodeExamples/kafka/segmentio/example_01/producer.go
@@ -0,0 +1,30 @@
+package main
+
+import (
+    "context"
+    "fmt"
+    "github.com/segmentio/kafka-go"
+    "time"
+)
+
+func main() {
+    topic := "helloTopic"
+    partition := 0
+    conn, err := kafka.DialLeader(context.Background(),
+        "tcp", "localhost:9092",topic,partition)
+    if err != nil {
+        panic(err)
+    }
+
+    defer conn.Close()
+
+    conn.SetWriteDeadline(time.Now().Add(3*time.Second))
+    msgs := []string{"Save", "the", "world", "with", "Go!!!"}
+    for _, m := range msgs {
+        l, err := conn.WriteMessages(kafka.Message{Value: []byte(m)})
+        if err != nil {
+            panic(err)
+        }
+        fmt.Printf("Sent %d bytes: %s\n", l,m)
+    }
+}
diff --git a/LectureCodeExamples/kafka/segmentio/example_02/consumer.go b/LectureCodeExamples/kafka/segmentio/example_02/consumer.go
new file mode 100644
index 0000000..74dc7c9
--- /dev/null
+++ b/LectureCodeExamples/kafka/segmentio/example_02/consumer.go
@@ -0,0 +1,31 @@
+package main
+
+import (
+    "context"
+    "fmt"
+    "github.com/segmentio/kafka-go"
+)
+
+func main () {
+    r := kafka.NewReader(kafka.ReaderConfig{
+        Brokers:    []string{"localhost:9092"},
+        Partition:  0,
+        Topic:      "helloTopic",
+        GroupID: "testGroup",
+        MinBytes:   10e3,
+        MaxBytes:   10e6,
+    })
+
+    defer r.Close()
+
+    for {
+        m, err := r.FetchMessage(context.Background())
+        if err != nil {
+            break
+        }
+        if err := r.CommitMessages(context.Background(), m); err != nil {
+            panic(err)
+        }
+        fmt.Printf("Topic %s msg: %s\n", m.Topic, m.Value)
+    }
+}
diff --git a/LectureCodeExamples/kafka/segmentio/example_02/go.mod b/LectureCodeExamples/kafka/segmentio/example_02/go.mod
new file mode 100644
index 0000000..d55117a
--- /dev/null
+++ b/LectureCodeExamples/kafka/segmentio/example_02/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/18_kafka/kafka-go/example_02
+
+go 1.15
+
+require github.com/segmentio/kafka-go v0.4.10
diff --git a/LectureCodeExamples/kafka/segmentio/example_02/go.sum b/LectureCodeExamples/kafka/segmentio/example_02/go.sum
new file mode 100644
index 0000000..a017519
--- /dev/null
+++ b/LectureCodeExamples/kafka/segmentio/example_02/go.sum
@@ -0,0 +1,34 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21 h1:YEetp8/yCZMuEPMUDHG0CW/brkkEp8mzqk2+ODEitlw=
+github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU=
+github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
+github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/klauspost/compress v1.9.8 h1:VMAMUUOh+gaxKTMk+zqbjsSjsIcUcL/LF4o63i82QyA=
+github.com/klauspost/compress v1.9.8/go.mod h1:RyIbtBH6LamlWaDj8nUwkbUhJ87Yi3uG0guNDohfE1A=
+github.com/pierrec/lz4 v2.0.5+incompatible h1:2xWsjqPFWcplujydGg4WmhC/6fZqK42wMM8aXeqhl0I=
+github.com/pierrec/lz4 v2.0.5+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/segmentio/kafka-go v0.4.10 h1:YnI820ZLfh710adINqwuCVtN3wbnLsLnT/+xhI0oooQ=
+github.com/segmentio/kafka-go v0.4.10/go.mod h1:BVDwBTF24avtlj4l8/xsWNb4papVeg16+jO6/0qjvhA=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/xdg/scram v0.0.0-20180814205039-7eeb5667e42c h1:u40Z8hqBAAQyv+vATcGgV0YCnDjqSL7/q/JyPhhJSPk=
+github.com/xdg/scram v0.0.0-20180814205039-7eeb5667e42c/go.mod h1:lB8K/P019DLNhemzwFU4jHLhdvlE6uDZjXFejJXr49I=
+github.com/xdg/stringprep v1.0.0 h1:d9X0esnoa3dFsV0FG35rAT0RIhYFlPq7MiP+DW89La0=
+github.com/xdg/stringprep v1.0.0/go.mod h1:Jhud4/sHMO4oL310DaZAKk9ZaJ08SJfe+sJh0HrGL1Y=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190506204251-e1dfcc566284 h1:rlLehGeYg6jfoyz/eDqDU1iRXLKfR42nnNh57ytKEWo=
+golang.org/x/crypto v0.0.0-20190506204251-e1dfcc566284/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3 h1:0GoQqolDA55aaLxZyTzK/Y2ePZzZTUrRacwib7cNsYQ=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/LectureCodeExamples/kafka/segmentio/example_02/producer.go b/LectureCodeExamples/kafka/segmentio/example_02/producer.go
new file mode 100644
index 0000000..9fcd648
--- /dev/null
+++ b/LectureCodeExamples/kafka/segmentio/example_02/producer.go
@@ -0,0 +1,26 @@
+package main
+
+import (
+    "context"
+    "fmt"
+    "github.com/segmentio/kafka-go"
+)
+
+func main() {
+    w := &kafka.Writer{
+        Addr:         kafka.TCP("localhost:9092"),
+        Topic:        "helloTopic",
+        Balancer:     &kafka.LeastBytes{},
+    }
+    defer w.Close()
+
+    msgs := []string{"Save", "the", "world", "with", "Go!!!"}
+    for _, m := range msgs {
+        err := w.WriteMessages(context.Background(), kafka.Message{Value: []byte(m)})
+        if err != nil {
+            panic(err)
+        }
+        fmt.Printf("Sent message: %s\n", m)
+    }
+    fmt.Printf("Producer sent: %d bytes\n", w.Stats().Bytes)
+}
diff --git a/LectureCodeExamples/logger/log/example_01/main.go b/LectureCodeExamples/logger/log/example_01/main.go
new file mode 100644
index 0000000..a22666a
--- /dev/null
+++ b/LectureCodeExamples/logger/log/example_01/main.go
@@ -0,0 +1,14 @@
+package main
+
+import "log"
+
+func main() {
+    // Panic or fatal messages stop the execution flow
+    // log.Fatal("This is a fatal message")
+    // log.Panic("This is a panic message")
+    log.Println("This is a log message")
+    log.SetPrefix("prefix -> ")
+    log.Println("This is a log message")
+    log.SetFlags(log.Lshortfile)
+
+}
diff --git a/LectureCodeExamples/logger/log/example_02/main.go b/LectureCodeExamples/logger/log/example_02/main.go
new file mode 100644
index 0000000..6f3e3b6
--- /dev/null
+++ b/LectureCodeExamples/logger/log/example_02/main.go
@@ -0,0 +1,16 @@
+package main
+
+import (
+    "io/ioutil"
+    "log"
+    "os"
+)
+
+func main() {
+    tmpFile, err := ioutil.TempFile(os.TempDir(),"logger.out")
+    if err != nil {
+        log.Panic(err)
+    }
+    logger := log.New(tmpFile, "prefix -> ", log.Ldate)
+    logger.Println("This is a log message")
+}
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_01/go.mod b/LectureCodeExamples/logger/zerolog/advanced/example_01/go.mod
new file mode 100644
index 0000000..60e13ed
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_01/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/advanced/example_01
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_01/go.sum b/LectureCodeExamples/logger/zerolog/advanced/example_01/go.sum
new file mode 100644
index 0000000..7af29d5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_01/go.sum
@@ -0,0 +1,12 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_01/main.go b/LectureCodeExamples/logger/zerolog/advanced/example_01/main.go
new file mode 100644
index 0000000..80c8dd0
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_01/main.go
@@ -0,0 +1,30 @@
+package main
+
+import (
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/log"
+    "math/rand"
+)
+
+type ComponentHook struct {
+    component string
+}
+
+func (h ComponentHook) Run(e *zerolog.Event, level zerolog.Level, msg string) {
+    if level == zerolog.DebugLevel {
+        e.Str("component", h.component)
+    }
+}
+
+type RandomHook struct{}
+
+func (r RandomHook) Run(e *zerolog.Event, level zerolog.Level, msg string) {
+    e.Int("random",rand.Int())
+}
+
+func main() {
+    logger := log.Hook(ComponentHook{"moduleA"})
+    logger = logger.Hook(RandomHook{})
+    logger.Info().Msg("Info message")
+    logger.Debug().Msg("Debug message")
+}
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_02/go.mod b/LectureCodeExamples/logger/zerolog/advanced/example_02/go.mod
new file mode 100644
index 0000000..cc9ca05
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_02/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/advanced/example_02
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_02/go.sum b/LectureCodeExamples/logger/zerolog/advanced/example_02/go.sum
new file mode 100644
index 0000000..7af29d5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_02/go.sum
@@ -0,0 +1,12 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_02/main.go b/LectureCodeExamples/logger/zerolog/advanced/example_02/main.go
new file mode 100644
index 0000000..f991232
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_02/main.go
@@ -0,0 +1,14 @@
+package main
+
+import (
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/log"
+)
+
+func main() {
+    logger := log.Sample(&zerolog.BasicSampler{N:200})
+    for i:=0;i<1000;i++{
+        logger.Info().Int("i",i).Msg("")
+    }
+}
+
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_03/go.mod b/LectureCodeExamples/logger/zerolog/advanced/example_03/go.mod
new file mode 100644
index 0000000..8538c59
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_03/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/advanced/example_03
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_03/go.sum b/LectureCodeExamples/logger/zerolog/advanced/example_03/go.sum
new file mode 100644
index 0000000..7af29d5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_03/go.sum
@@ -0,0 +1,12 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_03/main.go b/LectureCodeExamples/logger/zerolog/advanced/example_03/main.go
new file mode 100644
index 0000000..558c20d
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_03/main.go
@@ -0,0 +1,19 @@
+package main
+
+import (
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/log"
+    "time"
+)
+
+func main() {
+    logger := log.Sample(&zerolog.BurstSampler{
+        Burst: 2,
+        Period: time.Second * 5,
+        NextSampler: &zerolog.BasicSampler{N: 90000000},
+    })
+
+    for i:=0;i<99999999;i++{
+        logger.Info().Int("i",i).Msg("")
+    }
+}
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_04/go.mod b/LectureCodeExamples/logger/zerolog/advanced/example_04/go.mod
new file mode 100644
index 0000000..f3cdf65
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_04/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/advanced/example_04
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_04/go.sum b/LectureCodeExamples/logger/zerolog/advanced/example_04/go.sum
new file mode 100644
index 0000000..5318ea3
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_04/go.sum
@@ -0,0 +1,13 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1 h1:mhH9Nq+C1fY2l1XIpgxIiUOfNpRBYH1kKcr+qfKgjRc=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_04/main.go b/LectureCodeExamples/logger/zerolog/advanced/example_04/main.go
new file mode 100644
index 0000000..766c001
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_04/main.go
@@ -0,0 +1,30 @@
+package main
+
+import (
+    "net/http"
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/hlog"
+    "os"
+)
+
+var log zerolog.Logger = zerolog.New(os.Stdout).With().
+    Str("app","example_04").Logger()
+
+type MyHandler struct {}
+
+func(c MyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+    log.Info().Msg("This is not a request contextual logger")
+    hlog.FromRequest(r).Info().Msg("")
+    w.Write([]byte("Perfect!!!"))
+    return
+}
+
+func main() {
+    mine := MyHandler{}
+    a := hlog.NewHandler(log)
+    b := hlog.RemoteAddrHandler("ip")
+    c := hlog.UserAgentHandler("user_agent")
+    d := hlog.RequestIDHandler("req_id", "Request-Id")
+
+    panic(http.ListenAndServe(":8090", a(b(c(d(mine))))))
+}
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_05/go.mod b/LectureCodeExamples/logger/zerolog/advanced/example_05/go.mod
new file mode 100644
index 0000000..944ea15
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_05/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/advanced/example_05
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_05/go.sum b/LectureCodeExamples/logger/zerolog/advanced/example_05/go.sum
new file mode 100644
index 0000000..5318ea3
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_05/go.sum
@@ -0,0 +1,13 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1 h1:mhH9Nq+C1fY2l1XIpgxIiUOfNpRBYH1kKcr+qfKgjRc=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/advanced/example_05/main.go b/LectureCodeExamples/logger/zerolog/advanced/example_05/main.go
new file mode 100644
index 0000000..3599746
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/advanced/example_05/main.go
@@ -0,0 +1,50 @@
+package main
+
+import (
+    "net/http"
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/hlog"
+    "os"
+)
+
+var log zerolog.Logger = zerolog.New(os.Stdout).With().
+    Str("app","example_05").Logger()
+
+type MyHandler struct {}
+
+func(c MyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+    hlog.FromRequest(r).Info().Msg("")
+    w.Write([]byte("Perfect!!!"))
+    return
+}
+
+type Wrapper struct {
+    layers []func(http.Handler) http.Handler
+}
+
+func NewWrapper() *Wrapper {
+    layers := []func(http.Handler) http.Handler {
+        hlog.NewHandler(log),
+        hlog.RemoteAddrHandler("ip"),
+        hlog.UserAgentHandler("user_agent"),
+        hlog.RequestIDHandler("req_id", "Request-Id"),
+        hlog.MethodHandler("method"),
+        hlog.RequestHandler("url"),
+    }
+    return &Wrapper{layers}
+}
+
+func(w *Wrapper) GetWrapper(h http.Handler,i int) http.Handler {
+    if i >= len(w.layers) {
+        return h
+    }
+    return w.layers[i](w.GetWrapper(h,i+1))
+}
+
+func main() {
+    mine := MyHandler{}
+    wrapper := NewWrapper()
+    h := wrapper.GetWrapper(mine,0)
+
+    panic(http.ListenAndServe(":8090", h))
+}
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_01/go.mod b/LectureCodeExamples/logger/zerolog/basics/example_01/go.mod
new file mode 100644
index 0000000..7410675
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_01/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/example_01
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_01/go.sum b/LectureCodeExamples/logger/zerolog/basics/example_01/go.sum
new file mode 100644
index 0000000..7af29d5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_01/go.sum
@@ -0,0 +1,12 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_01/main.go b/LectureCodeExamples/logger/zerolog/basics/example_01/main.go
new file mode 100644
index 0000000..5bb3239
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_01/main.go
@@ -0,0 +1,16 @@
+package main
+
+import(
+    "github.com/rs/zerolog/log"
+)
+
+func main() {
+    // Panic or fatal messages stop the execution flow
+    // log.Panic().Msg("This is a panic message")
+    // log.Fatal().Msg("This is a fatal message")
+    log.Error().Msg("This is an error message")
+    log.Warn().Msg("This is a warning message")
+    log.Info().Msg("This is an information message")
+    log.Debug().Msg("This is a debug message")
+    log.Trace().Msg("This is a trace message")
+}
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_02/go.mod b/LectureCodeExamples/logger/zerolog/basics/example_02/go.mod
new file mode 100644
index 0000000..e9958fa
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_02/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/example_02
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_02/go.sum b/LectureCodeExamples/logger/zerolog/basics/example_02/go.sum
new file mode 100644
index 0000000..7af29d5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_02/go.sum
@@ -0,0 +1,12 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_02/main.go b/LectureCodeExamples/logger/zerolog/basics/example_02/main.go
new file mode 100644
index 0000000..76f266d
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_02/main.go
@@ -0,0 +1,17 @@
+package main
+
+import (
+    "github.com/rs/zerolog/log"
+    "github.com/rs/zerolog"
+)
+
+func main() {
+    zerolog.SetGlobalLevel(zerolog.DebugLevel)
+
+    log.Debug().Msg("Debug message is displayed")
+    log.Info().Msg("Info Message is displayed")
+
+    zerolog.SetGlobalLevel(zerolog.InfoLevel)
+    log.Debug().Msg("Debug message is no longer displayed")
+    log.Info().Msg("Info message is displayed")
+}
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_03/go.mod b/LectureCodeExamples/logger/zerolog/basics/example_03/go.mod
new file mode 100644
index 0000000..ebebc45
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_03/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/example_03
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_03/go.sum b/LectureCodeExamples/logger/zerolog/basics/example_03/go.sum
new file mode 100644
index 0000000..7af29d5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_03/go.sum
@@ -0,0 +1,12 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_03/main.go b/LectureCodeExamples/logger/zerolog/basics/example_03/main.go
new file mode 100644
index 0000000..33fbda4
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_03/main.go
@@ -0,0 +1,11 @@
+package main
+
+import(
+    "github.com/rs/zerolog/log"
+)
+
+func main() {
+    log.Info().Str("mystr","this is a string").Msg("")
+    log.Info().Int("myint",1234).Msg("")
+    log.Info().Int("myint",1234).Str("str","some string").Msg("And a regular message")
+}
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_04/go.mod b/LectureCodeExamples/logger/zerolog/basics/example_04/go.mod
new file mode 100644
index 0000000..1708c9c
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_04/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/example_04
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_04/go.sum b/LectureCodeExamples/logger/zerolog/basics/example_04/go.sum
new file mode 100644
index 0000000..7af29d5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_04/go.sum
@@ -0,0 +1,12 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_04/main.go b/LectureCodeExamples/logger/zerolog/basics/example_04/main.go
new file mode 100644
index 0000000..3bc9541
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_04/main.go
@@ -0,0 +1,29 @@
+package main
+
+import (
+    "encoding/json"
+    "github.com/rs/zerolog/log"
+)
+
+type AStruct struct {
+    FieldA string
+    FieldB int
+    fieldC bool
+}
+
+type AJSONStruct struct {
+    FieldA string   `json:"fieldA,omitempty"`
+    FieldB int      `json:"fieldB,omitempty"`
+    fieldC bool
+}
+
+func main() {
+    a := AStruct{"a string", 42, false}
+    b := AJSONStruct{"a string", 42, false}
+
+    log.Info().Interface("a",a).Msg("AStruct")
+    log.Info().Interface("b",b).Msg("AJSONStruct")
+
+    encoded, _ := json.Marshal(b)
+    log.Info().RawJSON("encoded",encoded).Msg("Encoded JSON")
+}
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_05/go.mod b/LectureCodeExamples/logger/zerolog/basics/example_05/go.mod
new file mode 100644
index 0000000..b97a939
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_05/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/basics/example_05
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_05/go.sum b/LectureCodeExamples/logger/zerolog/basics/example_05/go.sum
new file mode 100644
index 0000000..af0c41b
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_05/go.sum
@@ -0,0 +1,13 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_05/main.go b/LectureCodeExamples/logger/zerolog/basics/example_05/main.go
new file mode 100644
index 0000000..db097b4
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_05/main.go
@@ -0,0 +1,12 @@
+package main
+
+import (
+	"errors"
+	"github.com/rs/zerolog/log"
+)
+
+func main() {
+	err := errors.New("there is an error")
+
+	log.Error().Err(err).Msg("this is the way to log errors")
+}
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_06/go.mod b/LectureCodeExamples/logger/zerolog/basics/example_06/go.mod
new file mode 100644
index 0000000..5b58954
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_06/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/basics/example_06
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_06/go.sum b/LectureCodeExamples/logger/zerolog/basics/example_06/go.sum
new file mode 100644
index 0000000..af0c41b
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_06/go.sum
@@ -0,0 +1,13 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/basics/example_06/main.go b/LectureCodeExamples/logger/zerolog/basics/example_06/main.go
new file mode 100644
index 0000000..c7b0dc5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/basics/example_06/main.go
@@ -0,0 +1,27 @@
+package main
+
+import (
+    "github.com/pkg/errors"
+    "github.com/rs/zerolog/log"
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/pkgerrors"
+)
+
+func failA() error {
+    return failB()
+}
+
+func failB() error {
+    return failC()
+}
+
+func failC() error {
+    return errors.New("C failed")
+}
+
+func main() {
+    zerolog.ErrorStackMarshaler = pkgerrors.MarshalStack
+
+    err := failA()
+    log.Error().Stack().Err(err).Msg("")
+}
diff --git a/LectureCodeExamples/logger/zerolog/settings/example_01/go.mod b/LectureCodeExamples/logger/zerolog/settings/example_01/go.mod
new file mode 100644
index 0000000..1354a93
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/settings/example_01/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/settings/example_01
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/settings/example_01/go.sum b/LectureCodeExamples/logger/zerolog/settings/example_01/go.sum
new file mode 100644
index 0000000..7af29d5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/settings/example_01/go.sum
@@ -0,0 +1,12 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/settings/example_01/main.go b/LectureCodeExamples/logger/zerolog/settings/example_01/main.go
new file mode 100644
index 0000000..a8f5bc5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/settings/example_01/main.go
@@ -0,0 +1,22 @@
+package main
+
+import (
+    "io/ioutil"
+    "os"
+    "fmt"
+    "github.com/rs/zerolog/log"
+    "github.com/rs/zerolog"
+)
+
+func main() {
+    tempFile, err := ioutil.TempFile(os.TempDir(),"deleteme")
+    if err != nil {
+        // Can we log an error before we have our logger? :)
+        log.Error().Err(err).
+            Msg("there was an error creating a temporary file four our log")
+    }
+    defer tempFile.Close()
+    fileLogger := zerolog.New(tempFile).With().Logger()
+    fileLogger.Info().Msg("This is an entry from my log")
+    fmt.Printf("The log file is allocated at %s\n", tempFile.Name())
+}
diff --git a/LectureCodeExamples/logger/zerolog/settings/example_02/go.mod b/LectureCodeExamples/logger/zerolog/settings/example_02/go.mod
new file mode 100644
index 0000000..a9e98a6
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/settings/example_02/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/settings/example_02
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/settings/example_02/go.sum b/LectureCodeExamples/logger/zerolog/settings/example_02/go.sum
new file mode 100644
index 0000000..7af29d5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/settings/example_02/go.sum
@@ -0,0 +1,12 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/settings/example_02/main.go b/LectureCodeExamples/logger/zerolog/settings/example_02/main.go
new file mode 100644
index 0000000..0e4c14d
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/settings/example_02/main.go
@@ -0,0 +1,29 @@
+package main
+
+import (
+    "os"
+    "strings"
+    "time"
+    "fmt"
+    "github.com/rs/zerolog"
+)
+
+func main() {
+    output := zerolog.ConsoleWriter{Out: os.Stdout, TimeFormat: time.RFC3339}
+    output.FormatLevel = func(i interface{}) string {
+        return strings.ToUpper(fmt.Sprintf("| %-6s|", i))
+    }
+    output.FormatMessage = func(i interface{}) string {
+        return fmt.Sprintf(">>>%s<<<", i)
+    }
+    output.FormatFieldName = func(i interface{}) string {
+        return fmt.Sprintf("[%s]:", i)
+    }
+    output.FormatFieldValue = func(i interface{}) string {
+        return strings.ToUpper(fmt.Sprintf("[%s]", i))
+    }
+
+    log := zerolog.New(output).With().Timestamp().Logger()
+
+    log.Info().Str("foo", "bar").Msg("Save the world with Go!!!")
+}
diff --git a/LectureCodeExamples/logger/zerolog/settings/example_03/go.mod b/LectureCodeExamples/logger/zerolog/settings/example_03/go.mod
new file mode 100644
index 0000000..1eebcf9
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/settings/example_03/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/settings/example_03
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/settings/example_03/go.sum b/LectureCodeExamples/logger/zerolog/settings/example_03/go.sum
new file mode 100644
index 0000000..7af29d5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/settings/example_03/go.sum
@@ -0,0 +1,12 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/settings/example_03/main.go b/LectureCodeExamples/logger/zerolog/settings/example_03/main.go
new file mode 100644
index 0000000..25de6aa
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/settings/example_03/main.go
@@ -0,0 +1,29 @@
+package main
+
+import (
+    "io/ioutil"
+    "os"
+    "fmt"
+    "github.com/rs/zerolog"
+    "github.com/rs/zerolog/log"
+)
+
+func main() {
+
+    tempFile, err := ioutil.TempFile(os.TempDir(),"deleteme")
+    if err != nil {
+        log.Error().Err(err).
+            Msg("there was an error creating a temporary file four our log")
+    }
+    defer tempFile.Close()
+    fmt.Printf("The log file is allocated at %s\n", tempFile.Name())
+
+    fileWriter := zerolog.New(tempFile).With().Logger()
+    consoleWriter := zerolog.ConsoleWriter{Out: os.Stdout}
+
+    multi := zerolog.MultiLevelWriter(consoleWriter, os.Stdout, fileWriter)
+
+    logger := zerolog.New(multi).With().Timestamp().Logger()
+
+    logger.Info().Msg("Save the world with Go!!!")
+}
diff --git a/LectureCodeExamples/logger/zerolog/settings/example_04/go.mod b/LectureCodeExamples/logger/zerolog/settings/example_04/go.mod
new file mode 100644
index 0000000..f4274b6
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/settings/example_04/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/14_logger/zerolog/settings/example_04
+
+go 1.15
+
+require github.com/rs/zerolog v1.20.0 // indirect
diff --git a/LectureCodeExamples/logger/zerolog/settings/example_04/go.sum b/LectureCodeExamples/logger/zerolog/settings/example_04/go.sum
new file mode 100644
index 0000000..7af29d5
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/settings/example_04/go.sum
@@ -0,0 +1,12 @@
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
+github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
+github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/LectureCodeExamples/logger/zerolog/settings/example_04/main.go b/LectureCodeExamples/logger/zerolog/settings/example_04/main.go
new file mode 100644
index 0000000..56ea679
--- /dev/null
+++ b/LectureCodeExamples/logger/zerolog/settings/example_04/main.go
@@ -0,0 +1,14 @@
+package main
+
+import (
+    "os"
+    "github.com/rs/zerolog"
+)
+
+func main() {
+    mainLogger := zerolog.New(os.Stdout).With().Logger()
+    mainLogger.Info().Msg("This is the main logger")
+
+    subLogger := mainLogger.With().Str("component","componentA").Logger()
+    subLogger.Info().Msg("This is the sublogger")
+}
diff --git a/LectureCodeExamples/sql/README.md b/LectureCodeExamples/sql/README.md
new file mode 100644
index 0000000..8635d99
--- /dev/null
+++ b/LectureCodeExamples/sql/README.md
@@ -0,0 +1,9 @@
+# Relational databases
+
+This folder contains the examples from the relational databases chapter. These
+examples are written to run into a SQLite database which does not require any
+additional installation. The SQLite compatible driver to be used is available
+at [github.com/mattn/go-sqlite3](github.com/mattn/go-sqlite3) and is a CGO
+package that requires gcc to be compiled. If you have issues installing this
+package or getting the package with go modules, please refer to the original
+documentation from the package.
diff --git a/LectureCodeExamples/sql/gorm/example_01/go.mod b/LectureCodeExamples/sql/gorm/example_01/go.mod
new file mode 100644
index 0000000..65f47a7
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/example_01/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/gorm/example_01
+
+go 1.15
+
+require gorm.io/driver/sqlite v1.1.4 // indirect
diff --git a/LectureCodeExamples/sql/gorm/example_01/go.sum b/LectureCodeExamples/sql/gorm/example_01/go.sum
new file mode 100644
index 0000000..77b2516
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/example_01/go.sum
@@ -0,0 +1,10 @@
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1 h1:g39TucaRWyV3dwDO++eEc6qf8TVIQ/Da48WmqjZ3i7E=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7 h1:rMS4CL3pNmYq1V5/X+nHHjh1Dx6dnf27+Cai5zabo+M=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
diff --git a/LectureCodeExamples/sql/gorm/example_01/main.go b/LectureCodeExamples/sql/gorm/example_01/main.go
new file mode 100644
index 0000000..6362521
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/example_01/main.go
@@ -0,0 +1,37 @@
+package main
+
+import (
+    "gorm.io/driver/sqlite"
+    "gorm.io/gorm"
+)
+
+type User struct {
+    ID uint
+    Name string
+    Email string
+}
+
+func main() {
+    db, err := gorm.Open(sqlite.Open("/tmp/test.db"), &gorm.Config{})
+    if err != nil {
+        panic("failed to connect database")
+    }
+
+    err = db.AutoMigrate(&User{})
+    if err != nil {
+        panic(err)
+    }
+
+    u := User{Name: "John", Email: "john@gmail.com"}
+    db.Create(&u)
+
+    var recovered User
+    db.First(&recovered,"name=?","John")
+    fmt.Println("Recovered", recovered)
+
+    db.Model(&recovered).Update("Email","newemail")
+    db.First(&recovered,1)
+    fmt.Println("After update", recovered)
+
+    db.Delete(&recovered, 1)
+}
diff --git a/LectureCodeExamples/sql/gorm/manipulate/example_01/go.mod b/LectureCodeExamples/sql/gorm/manipulate/example_01/go.mod
new file mode 100644
index 0000000..fa064dd
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/manipulate/example_01/go.mod
@@ -0,0 +1,8 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/gorm/manipulate/example_01
+
+go 1.15
+
+require (
+	gorm.io/driver/sqlite v1.1.4 // indirect
+	gorm.io/gorm v1.20.12 // indirect
+)
diff --git a/LectureCodeExamples/sql/gorm/manipulate/example_01/go.sum b/LectureCodeExamples/sql/gorm/manipulate/example_01/go.sum
new file mode 100644
index 0000000..747f281
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/manipulate/example_01/go.sum
@@ -0,0 +1,11 @@
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1 h1:g39TucaRWyV3dwDO++eEc6qf8TVIQ/Da48WmqjZ3i7E=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
+gorm.io/gorm v1.20.12 h1:ebZ5KrSHzet+sqOCVdH9mTjW91L298nX3v5lVxAzSUY=
+gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
diff --git a/LectureCodeExamples/sql/gorm/manipulate/example_01/main.go b/LectureCodeExamples/sql/gorm/manipulate/example_01/main.go
new file mode 100644
index 0000000..6e1d3cd
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/manipulate/example_01/main.go
@@ -0,0 +1,34 @@
+package main
+
+import (
+    "fmt"
+    "gorm.io/driver/sqlite"
+    "gorm.io/gorm"
+)
+
+type User struct {
+    ID uint
+    Name string
+}
+
+func main() {
+    db, err := gorm.Open(sqlite.Open("/tmp/example01.db"), &gorm.Config{})
+    if err != nil {
+        panic("failed to connect database")
+    }
+
+    err = db.AutoMigrate(&User{})
+    if err != nil {
+        panic(err)
+    }
+
+    u := User{Name: "John"}
+    res := db.Create(&u)
+    fmt.Printf("User ID: %d, rows: %d\n",u.ID,res.RowsAffected)
+
+    users := []User{{Name:"Peter"},{Name:"Mary"}}
+    for _,i := range users {
+        db.Create(&i)
+    }
+    db.CreateInBatches(users,5)
+}
diff --git a/LectureCodeExamples/sql/gorm/manipulate/example_02/go.mod b/LectureCodeExamples/sql/gorm/manipulate/example_02/go.mod
new file mode 100644
index 0000000..8c3e267
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/manipulate/example_02/go.mod
@@ -0,0 +1,8 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/gorm/manipulate/example_02
+
+go 1.15
+
+require (
+	gorm.io/driver/sqlite v1.1.4 // indirect
+	gorm.io/gorm v1.20.12 // indirect
+)
diff --git a/LectureCodeExamples/sql/gorm/manipulate/example_02/go.sum b/LectureCodeExamples/sql/gorm/manipulate/example_02/go.sum
new file mode 100644
index 0000000..747f281
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/manipulate/example_02/go.sum
@@ -0,0 +1,11 @@
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1 h1:g39TucaRWyV3dwDO++eEc6qf8TVIQ/Da48WmqjZ3i7E=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
+gorm.io/gorm v1.20.12 h1:ebZ5KrSHzet+sqOCVdH9mTjW91L298nX3v5lVxAzSUY=
+gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
diff --git a/LectureCodeExamples/sql/gorm/manipulate/example_02/main.go b/LectureCodeExamples/sql/gorm/manipulate/example_02/main.go
new file mode 100644
index 0000000..69829cd
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/manipulate/example_02/main.go
@@ -0,0 +1,56 @@
+package main
+
+import (
+    "fmt"
+    "gorm.io/driver/sqlite"
+    "gorm.io/gorm"
+)
+
+type User struct {
+    ID uint
+    Name string
+}
+
+func main() {
+    db, err := gorm.Open(sqlite.Open("/tmp/example02.db"), &gorm.Config{})
+    if err != nil {
+        panic("failed to connect database")
+    }
+
+    err = db.AutoMigrate(&User{})
+    if err != nil {
+        panic(err)
+    }
+    users := []User{{Name: "John"},{Name: "Mary"},{Name: "Peter"},{Name:"Jeremy"}}
+    db.CreateInBatches(users,4)
+
+    var u User
+    db.First(&u)
+    fmt.Println("First",u)
+    u=User{}
+    db.Take(&u)
+    fmt.Println("Take",u)
+    u=User{}
+    db.Last(&u)
+    fmt.Println("Last",u)
+    u=User{}
+    db.First(&u,2)
+    fmt.Println("First ID=2",u)
+    var retrievedUsers []User
+    db.Find(&retrievedUsers)
+    fmt.Println("Find",retrievedUsers)
+    db.Find(&retrievedUsers,[]int{2,4})
+    fmt.Println("Find ID=2,ID=4",retrievedUsers)
+    u=User{}
+    db.Where("name = ?","Jeremy").First(&u)
+    fmt.Println("Where name=Jeremy",u)
+    db.Where("name LIKE ?","%J%").Find(&retrievedUsers)
+    fmt.Println("Where name=%J%",retrievedUsers)
+    db.Where("name LIKE ?","%J%").Or("name LIKE ?","%y").Find(&retrievedUsers)
+    fmt.Println("Name with J or y",retrievedUsers)
+    u=User{}
+    db.Where(&User{Name: "Mary"}).First(&u)
+    fmt.Println("User with name Mary",u)
+    db.Order("name asc").Find(&retrievedUsers)
+    fmt.Println("All users ordered by name",retrievedUsers)
+}
diff --git a/LectureCodeExamples/sql/gorm/manipulate/example_03/go.mod b/LectureCodeExamples/sql/gorm/manipulate/example_03/go.mod
new file mode 100644
index 0000000..1ccf40a
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/manipulate/example_03/go.mod
@@ -0,0 +1,8 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/gorm/manipulate/example_03
+
+go 1.15
+
+require (
+	gorm.io/driver/sqlite v1.1.4 // indirect
+	gorm.io/gorm v1.20.12 // indirect
+)
diff --git a/LectureCodeExamples/sql/gorm/manipulate/example_03/go.sum b/LectureCodeExamples/sql/gorm/manipulate/example_03/go.sum
new file mode 100644
index 0000000..747f281
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/manipulate/example_03/go.sum
@@ -0,0 +1,11 @@
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1 h1:g39TucaRWyV3dwDO++eEc6qf8TVIQ/Da48WmqjZ3i7E=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
+gorm.io/gorm v1.20.12 h1:ebZ5KrSHzet+sqOCVdH9mTjW91L298nX3v5lVxAzSUY=
+gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
diff --git a/LectureCodeExamples/sql/gorm/manipulate/example_03/main.go b/LectureCodeExamples/sql/gorm/manipulate/example_03/main.go
new file mode 100644
index 0000000..0859f8f
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/manipulate/example_03/main.go
@@ -0,0 +1,50 @@
+package main
+
+import (
+    "fmt"
+    "gorm.io/driver/sqlite"
+    "gorm.io/gorm"
+)
+
+type User struct {
+    ID uint
+    Name string
+    Email string
+    Laptops []Laptop
+}
+
+type Laptop struct {
+    ID uint
+    SerialNumber string
+    UserID uint
+}
+
+func main() {
+    // SQLite does not support foreign key constraints
+    db, err := gorm.Open(sqlite.Open("/tmp/example03.db"),
+        &gorm.Config{DisableForeignKeyConstraintWhenMigrating: true,})
+
+    if err != nil {
+        panic("failed to connect database")
+    }
+
+    err = db.AutoMigrate(&User{},&Laptop{})
+    if err != nil {
+        panic(err)
+    }
+
+    laptops := []Laptop{{SerialNumber: "sn0000001"},{SerialNumber: "sn0000002"}}
+    u := User{
+        Name:    "John",
+        Email:   "john@gmail.com",
+        Laptops: laptops,
+    }
+    db.Create(&u)
+    fmt.Println("Created", u)
+    var recovered User
+    db.First(&recovered)
+    fmt.Println("Recovered without preload",recovered)
+    recovered = User{}
+    db.Preload("Laptops").First(&recovered)
+    fmt.Println("Recovered with preload", recovered)
+}
diff --git a/LectureCodeExamples/sql/gorm/manipulate/example_04/go.mod b/LectureCodeExamples/sql/gorm/manipulate/example_04/go.mod
new file mode 100644
index 0000000..ef8b8df
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/manipulate/example_04/go.mod
@@ -0,0 +1,8 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/gorm/manipulate/example_04
+
+go 1.15
+
+require (
+	gorm.io/driver/sqlite v1.1.4 // indirect
+	gorm.io/gorm v1.20.12 // indirect
+)
diff --git a/LectureCodeExamples/sql/gorm/manipulate/example_04/go.sum b/LectureCodeExamples/sql/gorm/manipulate/example_04/go.sum
new file mode 100644
index 0000000..747f281
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/manipulate/example_04/go.sum
@@ -0,0 +1,11 @@
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1 h1:g39TucaRWyV3dwDO++eEc6qf8TVIQ/Da48WmqjZ3i7E=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
+gorm.io/gorm v1.20.12 h1:ebZ5KrSHzet+sqOCVdH9mTjW91L298nX3v5lVxAzSUY=
+gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
diff --git a/LectureCodeExamples/sql/gorm/manipulate/example_04/main.go b/LectureCodeExamples/sql/gorm/manipulate/example_04/main.go
new file mode 100644
index 0000000..ee7d4d1
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/manipulate/example_04/main.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+    "fmt"
+    "gorm.io/driver/sqlite"
+    "gorm.io/gorm"
+)
+
+type User struct {
+    ID uint
+    Name string
+    GroupID uint
+    Group Group
+}
+
+type Group struct {
+    ID uint
+    Name string
+}
+
+func main() {
+    db, err := gorm.Open(sqlite.Open("/tmp/example04.db"), &gorm.Config{})
+    if err != nil {
+        panic("failed to connect database")
+    }
+
+    err = db.AutoMigrate(&Group{},&User{})
+    if err != nil {
+        panic(err)
+    }
+
+    g := Group{Name: "TheCoolOnes"}
+    u := User{Name: "John", Group: g}
+    db.Create(&u)
+
+    var recovered User
+    db.Preload("Group").First(&recovered,1)
+    fmt.Println("Recovered", recovered)
+}
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_01/go.mod b/LectureCodeExamples/sql/gorm/modelling/example_01/go.mod
new file mode 100644
index 0000000..5bada9a
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_01/go.mod
@@ -0,0 +1,8 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/gorm/example_02
+
+go 1.15
+
+require (
+	gorm.io/driver/sqlite v1.1.4 // indirect
+	gorm.io/gorm v1.20.12 // indirect
+)
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_01/go.sum b/LectureCodeExamples/sql/gorm/modelling/example_01/go.sum
new file mode 100644
index 0000000..747f281
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_01/go.sum
@@ -0,0 +1,11 @@
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1 h1:g39TucaRWyV3dwDO++eEc6qf8TVIQ/Da48WmqjZ3i7E=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
+gorm.io/gorm v1.20.12 h1:ebZ5KrSHzet+sqOCVdH9mTjW91L298nX3v5lVxAzSUY=
+gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_01/main.go b/LectureCodeExamples/sql/gorm/modelling/example_01/main.go
new file mode 100644
index 0000000..8977cfe
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_01/main.go
@@ -0,0 +1,57 @@
+package main
+
+import (
+    "database/sql/driver"
+    "encoding/json"
+    "fmt"
+    "gorm.io/driver/sqlite"
+    "gorm.io/gorm"
+)
+
+type User struct {
+    Name string
+    Email string
+}
+
+func(u *User) Scan(src interface{}) error {
+    input := src.([]byte)
+    json.Unmarshal(input,u)
+    return nil
+}
+func(u User) Value()(driver.Value, error) {
+    enc, err := json.Marshal(u)
+    return enc,err
+}
+
+type Operator struct {
+    ID uint
+    User User `gorm:"embedded,embeddedPrefix:user_"`
+    Platform string `gorm:"not null"`
+    Dedication uint `gorm:"check:dedication>5"`
+}
+
+func main() {
+    db, err := gorm.Open(sqlite.Open("/tmp/example01.db"), &gorm.Config{})
+    if err != nil {
+        panic("failed to connect database")
+    }
+
+    err = db.AutoMigrate(&Operator{})
+    if err != nil {
+        panic(err)
+    }
+
+    op := Operator{
+        User: User{
+            Name:  "John",
+            Email: "john@gmail.com",
+        },
+        Platform: "k8s",Dedication:10,
+    }
+    db.Create(&op)
+    fmt.Println("Created", op)
+    var recovered Operator
+    db.First(&recovered,1)
+    fmt.Println("Recovered", recovered)
+}
+
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_02/go.mod b/LectureCodeExamples/sql/gorm/modelling/example_02/go.mod
new file mode 100644
index 0000000..55c109a
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_02/go.mod
@@ -0,0 +1,8 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/gorm/example_03
+
+go 1.15
+
+require (
+	gorm.io/driver/sqlite v1.1.4 // indirect
+	gorm.io/gorm v1.20.12 // indirect
+)
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_02/go.sum b/LectureCodeExamples/sql/gorm/modelling/example_02/go.sum
new file mode 100644
index 0000000..747f281
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_02/go.sum
@@ -0,0 +1,11 @@
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1 h1:g39TucaRWyV3dwDO++eEc6qf8TVIQ/Da48WmqjZ3i7E=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
+gorm.io/gorm v1.20.12 h1:ebZ5KrSHzet+sqOCVdH9mTjW91L298nX3v5lVxAzSUY=
+gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_02/main.go b/LectureCodeExamples/sql/gorm/modelling/example_02/main.go
new file mode 100644
index 0000000..eff30ba
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_02/main.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+    "fmt"
+    "gorm.io/driver/sqlite"
+    "gorm.io/gorm"
+)
+
+type User struct {
+    ID uint
+    Name string
+    Email string
+    GroupID uint
+    Group Group
+}
+
+type Group struct {
+    ID uint
+    Name string
+}
+
+func main() {
+    db, err := gorm.Open(sqlite.Open("/tmp/example02.db"), &gorm.Config{})
+    if err != nil {
+        panic("failed to connect database")
+    }
+
+    err = db.AutoMigrate(&Group{},&User{})
+    if err != nil {
+        panic(err)
+    }
+
+    g := Group{Name: "TheCoolOnes"}
+    u := User{Name: "John", Email: "john@gmail.com",Group: g}
+    db.Create(&u)
+    fmt.Println("Created",u)
+
+    var recovered User
+    db.Preload("Group").First(&recovered,1)
+    fmt.Println("Recovered", recovered)
+}
+
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_03/go.mod b/LectureCodeExamples/sql/gorm/modelling/example_03/go.mod
new file mode 100644
index 0000000..93a1d4b
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_03/go.mod
@@ -0,0 +1,9 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/gorm/example_04
+
+go 1.15
+
+require (
+	gorm.io/driver/mysql v1.0.4 // indirect
+	gorm.io/driver/sqlite v1.1.4 // indirect
+	gorm.io/gorm v1.20.12 // indirect
+)
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_03/go.sum b/LectureCodeExamples/sql/gorm/modelling/example_03/go.sum
new file mode 100644
index 0000000..8fa51e5
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_03/go.sum
@@ -0,0 +1,15 @@
+github.com/go-sql-driver/mysql v1.5.0 h1:ozyZYNQW3x3HtqT1jira07DN2PArx2v7/mN66gGcHOs=
+github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1 h1:g39TucaRWyV3dwDO++eEc6qf8TVIQ/Da48WmqjZ3i7E=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
+gorm.io/driver/mysql v1.0.4 h1:TATTzt+kR+IV0+h3iUB3dHUe8omCvQ0rOkmfCsUBohk=
+gorm.io/driver/mysql v1.0.4/go.mod h1:MEgp8tk2n60cSBCq5iTcPDw3ns8Gs+zOva9EUhkknTs=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
+gorm.io/gorm v1.20.12 h1:ebZ5KrSHzet+sqOCVdH9mTjW91L298nX3v5lVxAzSUY=
+gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_03/main.go b/LectureCodeExamples/sql/gorm/modelling/example_03/main.go
new file mode 100644
index 0000000..4e3c37e
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_03/main.go
@@ -0,0 +1,43 @@
+package main
+
+import (
+    "fmt"
+    "gorm.io/driver/sqlite"
+
+    "gorm.io/gorm"
+)
+// Has one
+type User struct {
+    ID uint
+    Name string
+    Email string
+    Laptop Laptop
+}
+
+type Laptop struct {
+    ID uint
+    SerialNumber string
+    UserID uint
+}
+
+func main() {
+    // SQLite does not support foreign key constraints
+    db, err := gorm.Open(sqlite.Open("/tmp/example03.db"), &gorm.Config{})
+    if err != nil {
+        panic("failed to connect database")
+    }
+
+    err = db.AutoMigrate(&User{},&Laptop{})
+    if err != nil {
+        panic(err)
+    }
+
+    u := User{Name: "John", Email: "john@gmail.com",Laptop: Laptop{SerialNumber: "sn101939"}}
+    db.Create(&u)
+    fmt.Println("Created", u)
+    var recovered User
+    db.Preload("Laptop").First(&recovered,1)
+    fmt.Println("Recovered",recovered)
+
+}
+
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_04/go.mod b/LectureCodeExamples/sql/gorm/modelling/example_04/go.mod
new file mode 100644
index 0000000..9ba43b1
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_04/go.mod
@@ -0,0 +1,9 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/gorm/example_05
+
+go 1.15
+
+require (
+	gorm.io/driver/mysql v1.0.4 // indirect
+	gorm.io/driver/sqlite v1.1.4 // indirect
+	gorm.io/gorm v1.20.12 // indirect
+)
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_04/go.sum b/LectureCodeExamples/sql/gorm/modelling/example_04/go.sum
new file mode 100644
index 0000000..8fa51e5
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_04/go.sum
@@ -0,0 +1,15 @@
+github.com/go-sql-driver/mysql v1.5.0 h1:ozyZYNQW3x3HtqT1jira07DN2PArx2v7/mN66gGcHOs=
+github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1 h1:g39TucaRWyV3dwDO++eEc6qf8TVIQ/Da48WmqjZ3i7E=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
+gorm.io/driver/mysql v1.0.4 h1:TATTzt+kR+IV0+h3iUB3dHUe8omCvQ0rOkmfCsUBohk=
+gorm.io/driver/mysql v1.0.4/go.mod h1:MEgp8tk2n60cSBCq5iTcPDw3ns8Gs+zOva9EUhkknTs=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
+gorm.io/gorm v1.20.12 h1:ebZ5KrSHzet+sqOCVdH9mTjW91L298nX3v5lVxAzSUY=
+gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_04/main.go b/LectureCodeExamples/sql/gorm/modelling/example_04/main.go
new file mode 100644
index 0000000..1980c08
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_04/main.go
@@ -0,0 +1,47 @@
+package main
+
+import (
+    "fmt"
+    "gorm.io/driver/sqlite"
+    "gorm.io/gorm"
+)
+// Has many
+type User struct {
+    ID uint
+    Name string
+    Email string
+    Laptops []Laptop
+}
+
+type Laptop struct {
+    ID uint
+    SerialNumber string
+    UserID uint
+}
+
+func main() {
+    // SQLite does not support foreign key constraints
+    db, err := gorm.Open(sqlite.Open("/tmp/example04.db"),
+        &gorm.Config{DisableForeignKeyConstraintWhenMigrating: true,})
+
+    if err != nil {
+        panic("failed to connect database")
+    }
+
+    err = db.AutoMigrate(&User{},&Laptop{})
+    if err != nil {
+        panic(err)
+    }
+
+    laptops := []Laptop{{SerialNumber: "sn0000001"},{SerialNumber: "sn0000002"}}
+    u := User{
+        Name:    "John",
+        Email:   "john@gmail.com",
+        Laptops: laptops,
+    }
+    db.Create(&u)
+    fmt.Println("Created", u)
+    var recovered User
+    db.Preload("Laptops").Find(&recovered,1)
+    fmt.Println("Recovered", recovered)
+}
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_05/go.mod b/LectureCodeExamples/sql/gorm/modelling/example_05/go.mod
new file mode 100644
index 0000000..4e421ed
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_05/go.mod
@@ -0,0 +1,8 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/gorm/example_06
+
+go 1.15
+
+require (
+	gorm.io/driver/sqlite v1.1.4 // indirect
+	gorm.io/gorm v1.20.12 // indirect
+)
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_05/go.sum b/LectureCodeExamples/sql/gorm/modelling/example_05/go.sum
new file mode 100644
index 0000000..747f281
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_05/go.sum
@@ -0,0 +1,11 @@
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1 h1:g39TucaRWyV3dwDO++eEc6qf8TVIQ/Da48WmqjZ3i7E=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
+gorm.io/gorm v1.20.12 h1:ebZ5KrSHzet+sqOCVdH9mTjW91L298nX3v5lVxAzSUY=
+gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
diff --git a/LectureCodeExamples/sql/gorm/modelling/example_05/main.go b/LectureCodeExamples/sql/gorm/modelling/example_05/main.go
new file mode 100644
index 0000000..5c3a3ec
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/modelling/example_05/main.go
@@ -0,0 +1,53 @@
+package main
+
+import (
+    "fmt"
+    "gorm.io/driver/sqlite"
+    "gorm.io/gorm"
+)
+// Many to many
+type User struct {
+    ID uint
+    Name string
+    Email string
+    Languages []Language `gorm:"many2many:user_languages"`
+    Laptops []*Laptop `gorm:"many2many:user_laptops"`
+}
+
+type Laptop struct {
+    ID uint
+    SerialNumber string
+    Users []*User `gorm:"many2many:user_laptops"`
+}
+
+type Language struct {
+    ID uint
+    Name string
+}
+
+func main() {
+    db, err := gorm.Open(sqlite.Open("/tmp/example05.db"), &gorm.Config{})
+
+    if err != nil {
+        panic("failed to connect database")
+    }
+
+    err = db.AutoMigrate(&Language{},&User{},&Laptop{})
+    if err != nil {
+        panic(err)
+    }
+
+    laptops := []*Laptop{{SerialNumber: "sn0000001"},{SerialNumber: "sn0000002"}}
+    languages := []Language{{Name: "Go"},{Name: "Python"}}
+    u := User{
+        Name:    "John",
+        Email:   "john@gmail.com",
+        Laptops: laptops,
+        Languages: languages,
+    }
+    db.Create(&u)
+    fmt.Println("Created", u)
+    var recovered User
+    db.Preload("Laptops").Find(&recovered,1)
+    fmt.Println("Recovered", recovered)
+}
diff --git a/LectureCodeExamples/sql/gorm/transactions/example_01/go.mod b/LectureCodeExamples/sql/gorm/transactions/example_01/go.mod
new file mode 100644
index 0000000..951f800
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/transactions/example_01/go.mod
@@ -0,0 +1,8 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/gorm/transactions/example_01
+
+go 1.15
+
+require (
+	gorm.io/driver/sqlite v1.1.4 // indirect
+	gorm.io/gorm v1.20.12 // indirect
+)
diff --git a/LectureCodeExamples/sql/gorm/transactions/example_01/go.sum b/LectureCodeExamples/sql/gorm/transactions/example_01/go.sum
new file mode 100644
index 0000000..747f281
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/transactions/example_01/go.sum
@@ -0,0 +1,11 @@
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1 h1:g39TucaRWyV3dwDO++eEc6qf8TVIQ/Da48WmqjZ3i7E=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
+gorm.io/gorm v1.20.12 h1:ebZ5KrSHzet+sqOCVdH9mTjW91L298nX3v5lVxAzSUY=
+gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
diff --git a/LectureCodeExamples/sql/gorm/transactions/example_01/main.go b/LectureCodeExamples/sql/gorm/transactions/example_01/main.go
new file mode 100644
index 0000000..40613f8
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/transactions/example_01/main.go
@@ -0,0 +1,44 @@
+package main
+
+import (
+    "fmt"
+    "gorm.io/driver/sqlite"
+    "gorm.io/gorm"
+)
+
+type User struct {
+    ID uint
+    Name string
+    Email string
+}
+func main() {
+    db, err := gorm.Open(sqlite.Open("/tmp/example01.db"), &gorm.Config{})
+
+    if err != nil {
+        panic("failed to connect database")
+    }
+
+    err = db.AutoMigrate(&User{})
+    if err != nil {
+        panic(err)
+    }
+
+    u := User{Name: "John", Email: "john@gmail.com"}
+    db.Create(&u)
+
+    db.Transaction(func(tx *gorm.DB) error {
+        if err := tx.Model(&u).Update("Email","newemail").Error; err != nil {
+            return err
+        }
+        var inside User
+        tx.First(&inside)
+        fmt.Println("Retrieved inside transaction", inside)
+        if err := tx.Create(&u).Error; err != nil {
+            return err
+        }
+        return nil
+    })
+    var retrieved User
+    db.First(&retrieved)
+    fmt.Println("Retrieved", retrieved)
+}
diff --git a/LectureCodeExamples/sql/gorm/transactions/example_02/go.mod b/LectureCodeExamples/sql/gorm/transactions/example_02/go.mod
new file mode 100644
index 0000000..b5f96d3
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/transactions/example_02/go.mod
@@ -0,0 +1,8 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/gorm/transactions/example_02
+
+go 1.15
+
+require (
+	gorm.io/driver/sqlite v1.1.4 // indirect
+	gorm.io/gorm v1.20.12 // indirect
+)
diff --git a/LectureCodeExamples/sql/gorm/transactions/example_02/go.sum b/LectureCodeExamples/sql/gorm/transactions/example_02/go.sum
new file mode 100644
index 0000000..747f281
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/transactions/example_02/go.sum
@@ -0,0 +1,11 @@
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.1 h1:g39TucaRWyV3dwDO++eEc6qf8TVIQ/Da48WmqjZ3i7E=
+github.com/jinzhu/now v1.1.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/mattn/go-sqlite3 v1.14.5 h1:1IdxlwTNazvbKJQSxoJ5/9ECbEeaTTyeU7sEAZ5KKTQ=
+github.com/mattn/go-sqlite3 v1.14.5/go.mod h1:WVKg1VTActs4Qso6iwGbiFih2UIHo0ENGwNd0Lj+XmI=
+gorm.io/driver/sqlite v1.1.4 h1:PDzwYE+sI6De2+mxAneV9Xs11+ZyKV6oxD3wDGkaNvM=
+gorm.io/driver/sqlite v1.1.4/go.mod h1:mJCeTFr7+crvS+TRnWc5Z3UvwxUN1BGBLMrf5LA9DYw=
+gorm.io/gorm v1.20.7/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
+gorm.io/gorm v1.20.12 h1:ebZ5KrSHzet+sqOCVdH9mTjW91L298nX3v5lVxAzSUY=
+gorm.io/gorm v1.20.12/go.mod h1:0HFTzE/SqkGTzK6TlDPPQbAYCluiVvhzoA1+aVyzenw=
diff --git a/LectureCodeExamples/sql/gorm/transactions/example_02/main.go b/LectureCodeExamples/sql/gorm/transactions/example_02/main.go
new file mode 100644
index 0000000..974d5f9
--- /dev/null
+++ b/LectureCodeExamples/sql/gorm/transactions/example_02/main.go
@@ -0,0 +1,52 @@
+package main
+
+import (
+    "fmt"
+    "gorm.io/driver/sqlite"
+    "gorm.io/gorm"
+)
+
+type User struct {
+    ID uint
+    Name string
+    Email string
+}
+
+func RunTransaction(u *User, db *gorm.DB) error{
+    tx := db.Begin()
+    if tx.Error != nil {
+        return tx.Error
+    }
+    if err := tx.Model(u).Update("Email","newemail").Error; err != nil {
+        return err
+    }
+    tx.SavePoint("savepoint")
+    if err := tx.Create(u).Error; err != nil{
+        tx.RollbackTo("savepoint")
+    }
+    return tx.Commit().Error
+}
+
+func main() {
+    db, err := gorm.Open(sqlite.Open("/tmp/example02.db"), &gorm.Config{})
+
+    if err != nil {
+        panic("failed to connect database")
+    }
+
+    err = db.AutoMigrate(&User{})
+    if err != nil {
+        panic(err)
+    }
+
+    u := User{Name: "John", Email: "john@gmail.com"}
+    db.Create(&u)
+
+    err = RunTransaction(&u, db)
+    if err != nil {
+        fmt.Println(err)
+    }
+    var retrieved User
+    db.First(&retrieved)
+    fmt.Println("Retrieved", retrieved)
+}
diff --git a/LectureCodeExamples/sql/sql/example_01/go.mod b/LectureCodeExamples/sql/sql/example_01/go.mod
new file mode 100644
index 0000000..bbff0dd
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_01/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/example_01
+
+go 1.15
+
+require github.com/mattn/go-sqlite3 v1.14.6
diff --git a/LectureCodeExamples/sql/sql/example_01/go.sum b/LectureCodeExamples/sql/sql/example_01/go.sum
new file mode 100644
index 0000000..f727d39
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_01/go.sum
@@ -0,0 +1,2 @@
+github.com/mattn/go-sqlite3 v1.14.6 h1:dNPt6NO46WmLVt2DLNpwczCmdV5boIZ6g/tlDrlRUbg=
+github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
diff --git a/LectureCodeExamples/sql/sql/example_01/main.go b/LectureCodeExamples/sql/sql/example_01/main.go
new file mode 100644
index 0000000..034a837
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_01/main.go
@@ -0,0 +1,32 @@
+package main
+
+import (
+    "context"
+    "database/sql"
+    "fmt"
+    "time"
+    _ "github.com/mattn/go-sqlite3"
+)
+
+func main() {
+
+    db, err := sql.Open("sqlite3","/tmp/example.db")
+
+    if err != nil {
+        fmt.Println(err)
+        panic(err)
+    }
+    defer db.Close()
+    db.SetConnMaxLifetime(time.Minute * 3)
+    db.SetMaxOpenConns(10)
+    db.SetMaxIdleConns(10)
+
+    ctx := context.Background()
+    if err := db.PingContext(ctx); err == nil {
+        fmt.Println("Database responds")
+    } else {
+        fmt.Println("Database does not respond")
+        panic(err)
+    }
+
+}
diff --git a/LectureCodeExamples/sql/sql/example_02/go.mod b/LectureCodeExamples/sql/sql/example_02/go.mod
new file mode 100644
index 0000000..6e3f47a
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_02/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/example_02
+
+go 1.15
+
+require github.com/mattn/go-sqlite3 v1.14.6
diff --git a/LectureCodeExamples/sql/sql/example_02/go.sum b/LectureCodeExamples/sql/sql/example_02/go.sum
new file mode 100644
index 0000000..f727d39
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_02/go.sum
@@ -0,0 +1,2 @@
+github.com/mattn/go-sqlite3 v1.14.6 h1:dNPt6NO46WmLVt2DLNpwczCmdV5boIZ6g/tlDrlRUbg=
+github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
diff --git a/LectureCodeExamples/sql/sql/example_02/main.go b/LectureCodeExamples/sql/sql/example_02/main.go
new file mode 100644
index 0000000..0747b7b
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_02/main.go
@@ -0,0 +1,68 @@
+package main
+
+import (
+    "context"
+    "database/sql"
+    "fmt"
+    "time"
+    _ "github.com/mattn/go-sqlite3"
+)
+
+func main() {
+
+    db, err := sql.Open("sqlite3","/tmp/example.db")
+
+    if err != nil {
+        fmt.Println(err)
+        panic(err)
+    }
+    defer db.Close()
+    db.SetConnMaxLifetime(time.Minute * 3)
+    db.SetMaxOpenConns(10)
+    db.SetMaxIdleConns(10)
+
+    ctx := context.Background()
+    if err := db.PingContext(ctx); err == nil {
+        fmt.Println("Database responds")
+    } else {
+        fmt.Println("Database does not respond")
+        panic(err)
+    }
+    create_table(db)
+    insert_rows(db)
+}
+
+const (
+    USERS_TABLE=`CREATE TABLE users(
+    name varchar(250) PRIMARY KEY,
+    email varchar(250)
+)`
+    USERS_INSERT="INSERT INTO users (name, email) VALUES(?,?)"
+)
+
+func create_table(db *sql.DB) {
+    ctx := context.Background()
+    _, err := db.ExecContext(ctx, USERS_TABLE)
+    if err != nil {
+        panic(err)
+    }
+}
+
+func insert_rows(db *sql.DB) {
+    ctx := context.Background()
+    result, err := db.ExecContext(ctx, USERS_INSERT,
+    "John", "john@gmail.com")
+    if err != nil {
+        panic(err)
+    }
+
+    lastUserId, err := result.LastInsertId()
+    if err != nil {
+        panic(err)
+    }
+    numRows, err := result.RowsAffected()
+    if err != nil {
+        panic(err)
+    }
+    fmt.Printf("User ID: %d, Rows: %d\n", lastUserId, numRows)
+}
diff --git a/LectureCodeExamples/sql/sql/example_03/go.mod b/LectureCodeExamples/sql/sql/example_03/go.mod
new file mode 100644
index 0000000..bd518f0
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_03/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/example_03
+
+go 1.15
+
+require github.com/mattn/go-sqlite3 v1.14.6
diff --git a/LectureCodeExamples/sql/sql/example_03/go.sum b/LectureCodeExamples/sql/sql/example_03/go.sum
new file mode 100644
index 0000000..f727d39
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_03/go.sum
@@ -0,0 +1,2 @@
+github.com/mattn/go-sqlite3 v1.14.6 h1:dNPt6NO46WmLVt2DLNpwczCmdV5boIZ6g/tlDrlRUbg=
+github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
diff --git a/LectureCodeExamples/sql/sql/example_03/main.go b/LectureCodeExamples/sql/sql/example_03/main.go
new file mode 100644
index 0000000..29ffcff
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_03/main.go
@@ -0,0 +1,53 @@
+package main
+
+import (
+    "context"
+    "database/sql"
+    "fmt"
+    "time"
+    _ "github.com/mattn/go-sqlite3"
+)
+
+func main() {
+
+    db, err := sql.Open("sqlite3","/tmp/example.db")
+
+    if err != nil {
+        fmt.Println(err)
+        panic(err)
+    }
+    defer db.Close()
+    db.SetConnMaxLifetime(time.Minute * 3)
+    db.SetMaxOpenConns(10)
+    db.SetMaxIdleConns(10)
+
+    ctx := context.Background()
+    if err := db.PingContext(ctx); err == nil {
+        fmt.Println("Database responds")
+    } else {
+        fmt.Println("Database does not respond")
+        panic(err)
+    }
+
+    get_rows(db)
+}
+
+type User struct {
+    Name string
+    Email string
+}
+
+func get_rows(db *sql.DB) {
+    ctx := context.Background()
+    rows, err := db.QueryContext(ctx, "SELECT * from users")
+    if err != nil {
+        panic(err)
+    }
+    defer rows.Close()
+
+    for rows.Next() {
+        u := User{}
+        rows.Scan(&u.Name,&u.Email)
+        fmt.Printf("%v\n",u)
+    }
+}
diff --git a/LectureCodeExamples/sql/sql/example_04/go.mod b/LectureCodeExamples/sql/sql/example_04/go.mod
new file mode 100644
index 0000000..b8150b1
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_04/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/example_04
+
+go 1.15
+
+require github.com/mattn/go-sqlite3 v1.14.6
diff --git a/LectureCodeExamples/sql/sql/example_04/go.sum b/LectureCodeExamples/sql/sql/example_04/go.sum
new file mode 100644
index 0000000..f727d39
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_04/go.sum
@@ -0,0 +1,2 @@
+github.com/mattn/go-sqlite3 v1.14.6 h1:dNPt6NO46WmLVt2DLNpwczCmdV5boIZ6g/tlDrlRUbg=
+github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
diff --git a/LectureCodeExamples/sql/sql/example_04/main.go b/LectureCodeExamples/sql/sql/example_04/main.go
new file mode 100644
index 0000000..be0ef2c
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_04/main.go
@@ -0,0 +1,51 @@
+package main
+
+import (
+    "context"
+    "database/sql"
+    "fmt"
+    "time"
+    _ "github.com/mattn/go-sqlite3"
+)
+
+func main() {
+
+    db, err := sql.Open("sqlite3","/tmp/example.db")
+
+    if err != nil {
+        fmt.Println(err)
+        panic(err)
+    }
+    defer db.Close()
+    db.SetConnMaxLifetime(time.Minute * 3)
+    db.SetMaxOpenConns(10)
+    db.SetMaxIdleConns(10)
+
+    ctx := context.Background()
+    if err := db.PingContext(ctx); err == nil {
+        fmt.Println("Database responds")
+    } else {
+        fmt.Println("Database does not respond")
+        panic(err)
+    }
+
+    runTransaction(db)
+}
+
+
+func runTransaction(db *sql.DB) {
+
+    tx, err := db.BeginTx(context.Background(), nil)
+    defer tx.Rollback()
+
+    ctx := context.Background()
+    _, err = tx.ExecContext(ctx, "INSERT INTO users(name, email) VALUES(?,?)",
+        "Peter", "peter@email.com")
+    if err != nil {
+        panic(err)
+    }
+    err = tx.Commit()
+    if err != nil {
+        panic(err)
+    }
+}
diff --git a/LectureCodeExamples/sql/sql/example_05/go.mod b/LectureCodeExamples/sql/sql/example_05/go.mod
new file mode 100644
index 0000000..9d4c85f
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_05/go.mod
@@ -0,0 +1,5 @@
+module github.com/arasevic/savetheworldwithgo/16_sql/sql/example_05
+
+go 1.15
+
+require github.com/mattn/go-sqlite3 v1.14.6
diff --git a/LectureCodeExamples/sql/sql/example_05/go.sum b/LectureCodeExamples/sql/sql/example_05/go.sum
new file mode 100644
index 0000000..f727d39
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_05/go.sum
@@ -0,0 +1,2 @@
+github.com/mattn/go-sqlite3 v1.14.6 h1:dNPt6NO46WmLVt2DLNpwczCmdV5boIZ6g/tlDrlRUbg=
+github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
diff --git a/LectureCodeExamples/sql/sql/example_05/main.go b/LectureCodeExamples/sql/sql/example_05/main.go
new file mode 100644
index 0000000..7143a80
--- /dev/null
+++ b/LectureCodeExamples/sql/sql/example_05/main.go
@@ -0,0 +1,57 @@
+package main
+
+import (
+    "context"
+    "database/sql"
+    "fmt"
+    "time"
+    _ "github.com/mattn/go-sqlite3"
+)
+
+func main() {
+
+    db, err := sql.Open("sqlite3", "/tmp/example.db")
+
+    if err != nil {
+        fmt.Println(err)
+        panic(err)
+    }
+    defer db.Close()
+    db.SetConnMaxLifetime(time.Minute * 3)
+    db.SetMaxOpenConns(10)
+    db.SetMaxIdleConns(10)
+
+    ctx := context.Background()
+    if err := db.PingContext(ctx); err == nil {
+        fmt.Println("Database responds")
+    } else {
+        fmt.Println("Database does not respond")
+        panic(err)
+    }
+    runStatement(db)
+}
+
+type User struct {
+    Name string
+    Email string
+}
+
+func runStatement(db *sql.DB) {
+    stmt, err := db.Prepare("select * from users where name = ?")
+    if err != nil {
+        panic(err)
+    }
+    defer stmt.Close()
+    result := stmt.QueryRow("Peter")
+    u := User{}
+
+    err =  result.Scan(&u.Name, &u.Email)
+    switch {
+    case err == sql.ErrNoRows:
+        panic(err)
+    case err != nil:
+        panic(err)
+    default:
+        fmt.Printf("%v\n",u)
+    }
+}
diff --git a/Projects/Project1/Project1Description.md b/Projects/Project1/Project1Description.md
new file mode 100644
index 0000000..7ef71da
--- /dev/null
+++ b/Projects/Project1/Project1Description.md
@@ -0,0 +1,67 @@
+# Simple Bookstore API with Go and PostgreSQL in Docker
+
+## Due Date: Friday January 17th 2025, 11:55 PM
+## Overview
+
+This project involves creating a RESTful API for a simple bookstore using Go (Golang) with PostgreSQL as the database, both containerized using Docker. The API allows users to perform basic CRUD (Create, Read, Update, Delete) operations on book records.
+
+### Features
+
+- CRUD Operations for book records.
+- PostgreSQL for persistent data storage.
+- Docker containerization of the Go application and PostgreSQL database.
+- Command-Line Interface for database operations.
+
+### Book Record Structure
+
+Each book record includes:
+
+- `ID`: A unique identifier (auto-generated by the database).
+- `Title`: The title of the book.
+- `Author`: The author of the book.
+- `ISBN`: International Standard Book Number.
+- `Price`: The price of the book.
+
+## Getting Started
+
+### Prerequisites
+
+- Docker must be installed on your machine. [Install Docker](https://www.docker.com/get-started)
+
+### Setup and Running the Application
+
+#### Start Services using Docker Compose
+
+In the project root directory:
+
+```bash
+docker-compose up -d
+```
+
+#### Build and Run the Go Application
+
+Make sure your Go application connects to PostgreSQL using credentials from `docker-compose.yml`.
+
+#### Interacting with the API
+
+Use command line flags to perform operations:
+
+eg:
+
+```bash
+go run . -action=create -title="Book Title" -author="Author Name" -isbn="1234567890" -price=19.99
+```
+
+Supported actions: create, list, update, delete.
+
+#### Shutting Down
+
+To stop the Docker containers:
+
+```bash
+docker-compose down
+```
+
+## Testing the Application
+
+Test CRUD operations via the command line.
diff --git a/Projects/Project1/db/db.go b/Projects/Project1/db/db.go
new file mode 100644
index 0000000..7503efe
--- /dev/null
+++ b/Projects/Project1/db/db.go
@@ -0,0 +1,72 @@
+package db
+
+import (
+    "database/sql"
+    "fmt"
+    "log"
+    "cmsc398b/project1/model"
+
+    _ "github.com/lib/pq"
+)
+
+const (
+    host     = "localhost"
+    port     = 5432
+    user     = "postgres"
+    password = "dbpassword"
+    dbname   = "project1"
+)
+
+// Connects to the database
+func ConnectDB() *sql.DB {
+    psqlInfo := fmt.Sprintf("host=%s port=%d user=%s "+
+        "password=%s dbname=%s sslmode=disable",
+        host, port, user, password, dbname)
+
+    db, err := sql.Open("postgres", psqlInfo)
+    if err != nil {
+        log.Fatalf("Error connecting to the database: %v", err)
+    }
+
+    err = db.Ping()
+    if err != nil {
+        log.Fatalf("Error pinging the database: %v", err)
+    }
+
+    fmt.Println("Successfully connected to the database")
+    return db
+}
+
+// Implement CRUD functions here
+
+// TODO
+// CreateBook adds a new book to the database
+// func CreateBook(db *sql.DB, book model.Book) error {
+// }
+
+// TODO
+// GetBooks retrieves all books from the database
+// func GetBooks(db *sql.DB) ([]model.Book, error) {
+   
+//}
+
+// TODO
+//func UpdateBook(db *sql.DB, book model.Book) error {
+//}
+
+// DeleteBook removes a book from the database
+//func DeleteBook(db *sql.DB, id string) error {
+//}
+
+// InitializeDB sets up the necessary tables in the database
+func InitializeDB(db *sql.DB) error {
+    tableCreationQuery := `CREATE TABLE IF NOT EXISTS books (
+        id SERIAL PRIMARY KEY,
+        title TEXT NOT NULL,
+        author TEXT NOT NULL,
+        isbn TEXT NOT NULL,
+        price NUMERIC(10, 2) NOT NULL
+    )`
+    _, err := db.Exec(tableCreationQuery)
+    return err
+}
diff --git a/Projects/Project1/docker-compose.yml b/Projects/Project1/docker-compose.yml
new file mode 100644
index 0000000..be1fdd7
--- /dev/null
+++ b/Projects/Project1/docker-compose.yml
@@ -0,0 +1,18 @@
+version: '3.8'
+services:
+  postgres:
+    image: postgres:latest
+    container_name: PostgresCont
+    restart: always
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: dbpassword
+      POSTGRES_DB: project1
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_db:/var/lib/postgresql/data
+
+volumes:
+  postgres_db:
+    driver: local
diff --git a/Projects/Project1/go.mod b/Projects/Project1/go.mod
new file mode 100644
index 0000000..55da36a
--- /dev/null
+++ b/Projects/Project1/go.mod
@@ -0,0 +1,5 @@
+module cmsc398b/project1
+
+go 1.23
+
+require github.com/lib/pq v1.10.9
diff --git a/Projects/Project1/go.sum b/Projects/Project1/go.sum
new file mode 100644
index 0000000..aeddeae
--- /dev/null
+++ b/Projects/Project1/go.sum
@@ -0,0 +1,2 @@
+github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
+github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
diff --git a/Projects/Project1/main.go b/Projects/Project1/main.go
new file mode 100644
index 0000000..532701b
--- /dev/null
+++ b/Projects/Project1/main.go
@@ -0,0 +1,53 @@
+package main
+
+import (
+    "flag"
+    "log"
+    "fmt"
+    "os"
+    "cmsc398b/project1/db"
+    "cmsc398b/project1/model"
+)
+
+func main() {
+    dbConn := db.ConnectDB()
+    defer dbConn.Close()
+
+    // Call CRUD operations here
+
+	err := db.InitializeDB(dbConn)
+    if err != nil {
+        log.Fatalf("Could not initialize database: %v", err)
+    }
+
+    action := flag.String("action", "list", "Action to perform (create, read, update, delete, list)")
+    id := flag.String("id", "", "Book ID")
+    title := flag.String("title", "", "Book Title")
+    author := flag.String("author", "", "Book Author")
+    isbn := flag.String("isbn", "", "Book ISBN")
+    price := flag.Float64("price", 0, "Book Price")
+    
+    flag.Usage = func() {
+      fmt.Fprintf(flag.CommandLine.Output(),
+      "Go Curl CMSC398B Winter 2024 Project 1\n")
+      fmt.Fprintln(flag.CommandLine.Output(), "Usage information:")
+      flag.PrintDefaults()
+    }
+    
+    flag.Parse()
+
+    switch *action {
+        case "create":
+            // TODO
+        case "list":
+           // TODO
+        case "update":
+          // TODO
+        case "delete":
+          // TODO
+        default:
+            // Invalid flag provided
+            flag.Usage()
+            os.Exit(1)    
+    }
+}
diff --git a/Projects/Project1/model/book.go b/Projects/Project1/model/book.go
new file mode 100644
index 0000000..0923df5
--- /dev/null
+++ b/Projects/Project1/model/book.go
@@ -0,0 +1,6 @@
+package model
+
+// TODO
+// Create a Book struct that represents a book entity
+// Fields: ID => string, Title => string, Author=> string
+// ISBN => string, Price => float64
-- 
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