Adrian / imaxmultiean

<?php

function upgrade_module_1_4($module) {
    $sql = array();

    $sql[] = "ALTER TABLE `"._DB_PREFIX_.$module->prefijo."multiean`
              ADD UNIQUE KEY `unique_ean_per_product_combination` (`id_product`, `ean13`);";

    foreach ($sql as $query) {
        if (Db::getInstance()->execute($query) == false) {
            return false;
        }
    }

    return true;
}