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CodeIgniter Active Record Tutorial: A Deep Dive

CodeIgniter's Active Record is a powerful, yet simple, database abstraction layer. It simplifies database interactions by providing a fluent interface, allowing you to build database queries programmatically without writing raw SQL. This promotes code readability, maintainability, and, to some extent, security by handling escaping and quoting.

This tutorial will cover the following:

1. *Introduction to Active Record and its benefits.*
2. *Loading the database library and connecting to your database.*
3. *Basic Active Record operations:*
*Selecting data ( `get()`, `select()`, `where()`, `order_by()`, `limit()`, `like()`, `or_like()`, `not_like()`, `or_not_like()`, `group_by()`, `having()`, `or_having()`, `join()`, `or_where()`, `where_in()`, `or_where_in()`, `where_not_in()`, `or_where_not_in()`, `between()`, `or_between()`, `not_between()`, `or_not_between()`)*
*Inserting data ( `insert()`, `insert_batch()` )*
*Updating data ( `update()`, `update_batch()` )*
*Deleting data ( `delete()`, `empty_table()`, `truncate()` )*
*Counting results ( `count_all_results()`, `count_all()`)*
4. *Active Record caching.*
5. *Using Active Record with Custom Queries.*
6. *Query Builder Class (non-AR approach)*
7. *Best Practices and Security Considerations.*

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*1. Introduction to Active Record and its Benefits:*

Active Record (AR) in CodeIgniter acts as a wrapper around database queries. Instead of writing SQL strings directly, you use a series of method calls that are then translated into SQL.

*Benefits of using Active Record:*

*Readability:* AR code is generally easier to read and understand than raw SQL.
*Maintainability:* Changes to your database schema are less likely to require extensive code modifications when using AR. You only need to update the Active Record calls, not the SQL strings scattered throughout your application.
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