$db_user=$app->db->queryOneRecord("SELECT `database_user`, `database_password` FROM `web_database_user` WHERE `database_user_id` = ?",$data['new']['database_user_id']);
$old_db_user=$app->db->queryOneRecord("SELECT `database_user`, `database_password` FROM `web_database_user` WHERE `database_user_id` = ?",$data['old']['database_user_id']);