Correct code for app

PART 1: See [login to view URL] In app/application/config/[login to view URL], You will find config file to connect script to DB. It use: $db['default']['dbprefix'] = ''; and $db['default']['swap_pre'] = ''; But if I change prefix in database and in this file it doest work. See screenshot [login to view URL] It happened because in code don’t use prefix for query to DB. See part of code: $query = "SELECT `user`.`id`,`user`.`name` as `name`,`email`,`user`.`accesslevel`,`accesslevel`.`name` as `access` FROM `user` INNER JOIN `accesslevel` ON `user`.`accesslevel` = `accesslevel`.`id` WHERE `email` LIKE '$username' AND `password` LIKE '$password' AND `status`=1 AND `accesslevel` IN (1,2) «; So I need make this code query to DB with prefix. PART 2: I neet to use variable prefix in database.php. We can take prefix from folder name. [login to view URL] Point is I need when I make new blog using BlockThemplate pluginn, new blog will have new DB tables of app script and script will be connect to new DB prefix.