system/libraries/Migration.php

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<?php defined('BASEPATH') OR exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		EllisLab Dev Team
 * @copyright	Copyright (c) 2006 - 2012, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * Migration Class
 *
 * All migrations should implement this, forces up() and down() and gives
 * access to the CI super-global.
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Libraries
 * @author		Reactor Engineers
 * @link
 */
class CI_Migration {

	protected $_migration_enabled = FALSE;
	protected $_migration_path = NULL;
	protected $_migration_version = 0;

	protected $_error_string = '';

	public function __construct($config = array())
	{
		# Only run this constructor on main library load
		if (get_parent_class($this) !== FALSE)
		{
			return;
		}

		foreach ($config as $key => $val)
		{
			$this->{'_' . $key} = $val;
		}

		log_message('debug', 'Migrations class initialized');

		// Are they trying to use migrations while it is disabled?
		if ($this->_migration_enabled !== TRUE)
		{
			show_error('Migrations has been loaded but is disabled or set up incorrectly.');
		}

		// If not set, set it
		$this->_migration_path == '' AND $this->_migration_path = APPPATH . 'migrations/';