root/trunk/system/libraries/Model.php

<?php
/**
 * Model base class.
 *
 * $Id$
 *
 * @package    Core
 * @author     Kohana Team
 * @copyright  (c) 2007-2008 Kohana Team
 * @license    http://kohanaphp.com/license.html
 */
class Model_Core {

    protected $db;

    /**
     * Loads the database instance, if the database is not already loaded.
     *
     * @return  void
     */
    public function __construct()
    {
        if ( ! is_object($this->db))
        {
            // Load the default database
            $this->db = Database::instance('default');
        }
    }

} // End Model