How to create database connection using CodeIgniter?

This post explains about How to create database connection using Codegniter. Follow the below steps
1. Create new/existing user for your application
2. Create new/existing database for your application
3. Get those details and update in below file
4. Run the application

in the file at : application\config\database.php.

we have to configured the database connection.

$db['default']['hostname'] = ""; // Host Name
$db['default']['username'] = ""; // User Name
$db['default']['password'] = ""; // Password
$db['default']['database'] = ""; // Database Name
$db['default']['dbdriver'] = ""; // Databse driver.

when we configured we can connect to the database.