app/code/core/Mage/Core/Model/Mysql4/Url/Rewrite.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Core
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Url rewrite resource model class
 *
 *
 * @category   Mage
 * @package    Mage_Core
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Core_Model_Mysql4_Url_Rewrite extends Mage_Core_Model_Mysql4_Abstract
{
    protected $_tagTable;

    protected function _construct()
    {
        $this->_init('core/url_rewrite', 'url_rewrite_id');
        $this->_tagTable = $this->getTable('url_rewrite_tag');
    }

    /**
     * Initialize unique fields
     *
     * @return Mage_Core_Model_Mysql4_Abstract
     */
    protected function _initUniqueFields()
    {
        $this->_uniqueFields = array(
            array(
                'field' => array('id_path','store_id','is_system'),
                'title' => Mage::helper('core')->__('Id path for specified store')
            ),
            array(
                 'field' => array('request_path','store_id'),
                 'title' => Mage::helper('core')->__('Request path for specified store'),
            )
        );
        return $this;
    }

    /**
     * Retrieve select object for load object data
     *
     * @param string $field
     * @param mixed $value
     * @return Zend_Db_Select
     */
    protected function _getLoadSelect($field, $value, $object)
    {
        $select = parent::_getLoadSelect($field, $value, $object);

        if (!is_null($object->getStoreId())) {
            $select->where('store_id=0 or store_id=?', $object->getStoreId());
            $select->order('store_id', 'desc');
        }

        return $select;
    }
}

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