<?php
/*
* 2007-2013 PrestaShop
*
* 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@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2013 PrestaShop SA
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

/* Remove duplicate entries from ps_category_product */
function clean_category_product()
{
	$list = Db::getInstance()->ExecuteS('
	SELECT id_category, id_product, COUNT(*) n
	FROM '._DB_PREFIX_.'category_product
	GROUP BY CONCAT(id_category,\'|\',id_product)
	HAVING n > 1');

	$result = true;
	if ($list)
		foreach ($list as $l)
			$result &= Db::getInstance()->Execute('DELETE FROM '._DB_PREFIX_.'category_product
			WHERE id_product = '.(int)$l['id_product'].' AND id_category = '.(int)$l['id_category'].' LIMIT '.(int)($l['n'] - 1));

	return $result;
}