CodeIgniter Database

CodeIgniter provides a powerful database library which is responsible for handling all the interactions with the database. Whether it is a simple SELECT query or a complex JOIN operation, the CodeIgniter database library makes it easy to work with databases.

Syntax

The CodeIgniter database library provides a simple and intuitive syntax for working with databases. Here is a basic example for querying data from a database table:

$this->db->get('table_name');

Example

Let's assume we have a database table named users which contains data about users. Here is an example of how to retrieve all data from the users table:

$query = $this->db->get('users');
$result = $query->result();
print_r($result);

This will retrieve all the data from the users table and print the result on the screen.

Explanation

The get() method of the database library is used to retrieve data from a database table. The table name is passed as an argument to this method. The result() method is used to retrieve the resulting rows as an array of objects. This array can then be used to access the retrieved data.

Use

The CodeIgniter database library can be used to perform SQL queries, execute simple or complex database operations, and access the results of those operations. It provides a unified interface for working with different database systems.

Important Points

• CodeIgniter supports multiple database systems including MySQL, MSSQL, Oracle, SQLite, and PostgreSQL.
• The database configuration settings can be defined in the application/config/database.php file.
• CodeIgniter provides an active record class that simplifies the process of building complex SQL queries.

Summary

The CodeIgniter database library provides a simple and intuitive syntax for working with databases. It supports multiple database systems and provides an active record class for building complex SQL queries. The library is easy to use and provides a unified interface for working with different database systems.