Restore database

Hi CI Team,

I need your help to correct my  about restore database on CI,

PHP Code:

function restoredb()
    {
        $isi_file = file_get_contents(FCPATH.'backup/ori_db.sql');
        $string_query = rtrim( $isi_file, "\n;" );
        $array_query = explode(";", $query);
        foreach($array_query as $query)
        {
            $this->db->query($query);
        }
    } 


Thanks