<?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@magento.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.magento.com for more information.
 *
 * @category    Mage
 * @package     Mage_Sales
 * @copyright  Copyright (c) 2006-2016 X.commerce, Inc. and affiliates (http://www.magento.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

$installer = $this;
/* @var $installer Mage_Sales_Model_Mysql4_Setup */

// add FK constraint on products to flat quote items

$installer->run("
DELETE FROM `{$this->getTable('sales_flat_quote_item')}`
WHERE `product_id` NOT IN (
    SELECT `entity_id` FROM `{$this->getTable('catalog_product_entity')}`
)
");

$installer->getConnection()->addConstraint(
    'FK_SALES_QUOTE_ITEM_CATALOG_PRODUCT_ENTITY',
    $this->getTable('sales_flat_quote_item'), 'product_id',
    $this->getTable('catalog_product_entity'), 'entity_id'
);