php - Fatal error: Call to a member function query() on a non-object -

i've got error:

sqlstate[] (null) (severity 0) fatal error: call member function query() on non-object in /.../functions.php on line 50

line 50 :

    foreach($this->sqldbkowsar->dbh->query($sql) $row) 

db_functions class :

<?php  class db_functions {      private $sqldbkowsar;      // constructor     function __construct() {          require_once 'db_connect.php';         // connecting database         $this->sqldbkowsar = new db_connect();         $this->sqldbkowsar->connect();      }      // destructor     function __destruct() {      }       function getsimplesearch($title,$cat,$start_end){           $start_and_end = explode("-",$start_end);         $cat = $this->getcategories($cat);         $array_of_cat = explode(",",$cat);          $sql = "select * ( select *,row_number() on (order goodmaincode) row [sarmem].[dbo].[book_data1] goodname ' %$title% ' ,  groupcode in (" . implode(",",$array_of_cat) . ") ) a.row > $start_and_end[0] , a.row <= $start_and_end[1] ";          $mjson = array();          foreach($this->sqldbkowsar->dbh->query($sql) $row){             $arr = array(                 'goodmaincode'=>persian_sql_to_php($row['goodmaincode'])              );               array_push($mjson,$arr);          }          //added        foreach($mjson $v){            if(!isset($result[$main_good_code = $v['goodmaincode']])){               $result[$main_good_code = $v['goodmaincode']] = $v;           }           else               $result[$main_good_code = $v['goodmaincode']]['amount'] += $v['amount'];       }          return $result ;      }//end simple search function  }  ?> 

db_connect class :

class db_connect {   public  $dbh;  // constructor  function __construct() {    }    // destructor  function __destruct() {      // $this->close();  }    // connecting database  public function connect() {      require_once 'config.php';      try {          $hostname = db_host ;          $dbname   = db_database;          $port = 1433;         $this->dbh = new pdo ("dblib:host=$hostname;dbname=$dbname;charset=utf-8",db_user, db_password);      }      catch(pdoexception $e)      {          echo $e->getmessage();      }  }  } 

what wrong ?

first try , edit db_connect class this:

class db_connect {   public  $dbh;  // constructor  function __construct() {      require_once 'config.php';      try {          $hostname = db_host ;          $dbname   = db_database;          $port = 1433;         $this->dbh = new pdo ("dblib:host=$hostname;dbname=$dbname;charset=utf-8",db_user, db_password);      }      catch(pdoexception $e)      {          echo $e->getmessage();      }  }    // destructor  function __destruct() {      // $this->close();  }    // connecting database  public function connect() {  return $this->dbh;  }  } 

then in db_functions edit

function __construct() {          require_once 'db_connect.php';         // connecting database         $this->sqldbkowsar = new db_connect();         $this->sqldbkowsar->connect();      } 

like this

private $con;  function __construct() {          require_once 'db_connect.php';         // connecting database         $this->sqldbkowsar = new db_connect();       $this->con = $this->sqldbkowsar->connect();      } 

then in foreach loop edit to

foreach($this->con->query($sql) $row) 

i didn't tested actual code tell me if problem persists