<?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_Review
 * @copyright  Copyright (c) 2006-2017 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_Core_Model_Resource_Setup */

$installer->startSetup();

$tableReviewDetail = $installer->getTable('review/review_detail');
$tableCustomer = $installer->getTable('customer_entity');

$installer->run("UPDATE {$tableReviewDetail} SET customer_id=NULL WHERE customer_id NOT IN (SELECT entity_id FROM {$tableCustomer})");

$installer->getConnection()->addConstraint('FK_REVIEW_DETAIL_CUSTOMER',
    $tableReviewDetail, 'customer_id',
    $tableCustomer, 'entity_id',
    'SET NULL', 'CASCADE', true);

$installer->endSetup();