CakePHP working with multiple environment databases

database.php

<?php
/**
* CakePHP 2.x
* This is a database sample file for use multiple environment in CakePHP
* To find out what the environment is being used at the time just check the configuration 'current_environment'. 
* E.g: echo Configure::read('current_environment');
*/

class DATABASE_CONFIG
{
	public $default = null;
	

        # Production database settings
	public $prod = 
		array(
			'datasource' => 'Database/Mysql',
			'persistent' => false,
			'host' => 'localhost',
			'login' => 'production_user',
			'password' => 'production_password',
			'database' => 'production_database',
			'prefix' => '',
			'encoding' => 'utf8',
		);
 
        # Development database settings
	public $dev = 
		array(
			'datasource' => 'Database/Mysql',
			'persistent' => false,
			'host' => 'localhost',
			'login' => 'development_user',
			'password' => 'development_password',
			'database' => 'development_database',
			'prefix' => '',
			'encoding' => 'utf8',
		);

	# Tests database settings
	public $tests = 
		array();		
 
 
	function __construct ()
	{		
		# If you do not find the server name, automatically places the environment for developing
		if(isset($_SERVER['SERVER_NAME'])){

			# Environments with their urls
			switch($_SERVER['SERVER_NAME']){

				case 'localhost':
					$this->default = $this->dev;

					# Changing the environment to 'development'
					Configure::write('current_environment','dev');
					
					# Sets the Debug to 2
					Configure::write('debug',2); 

					break;
				case 'myapp.com':
					$this->default = $this->prod;

					# Changing the environment to 'production'
					Configure::write('current_environment','prod');

					# Sets the Debug to 0 ( Production )
					Configure::write('debug',0);
					break;
			}
		}
	  else
	  {
	    $this->default = $this->dev;
	  }
	}
}