<?php
/*
* 2007-2015 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  2007-2015 PrestaShop SA
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/
function drop_module_non_unique_index()
{
    $index = Db::getInstance()->executeS('SHOW INDEX FROM `'._DB_PREFIX_.'module` WHERE Key_name = "name"');
    if (is_array($index) && count($index)) {
        Db::getInstance()->execute('ALTER IGNORE TABLE `'._DB_PREFIX_.'module` DROP INDEX `name`');
    }
    $tmp = Db::getInstance()->executeS('SHOW SESSION VARIABLES WHERE Variable_Name LIKE "old_alter_table" AND Value like "OFF"');
    if (is_array($tmp) && $tmp) {
        Db::getInstance()->execute('SET SESSION old_alter_table="ON"');
    }
    Db::getInstance()->execute('ALTER IGNORE TABLE `'._DB_PREFIX_.'module` ADD UNIQUE `name` (`name`)');
    if (is_array($tmp) && $tmp) {
        Db::getInstance()->execute('SET SESSION old_alter_table="OFF"');
    }
}