public function edit($tablename, $datafields = array(), $tablefields = array(), $condition)
 {
     //edit data
     $dbconfig = new DBconfig();
     $host = $dbconfig->host();
     $user = $dbconfig->username();
     $pwd = $dbconfig->pwd();
     $db = $dbconfig->db();
     $set = DBmain::mixingforupdatequery($datafields, $tablefields);
     try {
         $conn = new PDO("mysql:host={$host};dbname={$db}", $user, $pwd);
         // set the PDO error mode to exception
         $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
         $sql = "UPDATE " . $tablename . " SET " . $set . " WHERE " . $condition . "";
         // use exec() because no results are returned
         $conn->exec($sql);
     } catch (PDOException $e) {
         echo $sql . "<br>" . $e->getMessage();
     }
     $conn = null;
 }
 public function edit($tablename, $datafields = array(), $tablefields = array(), $condition)
 {
     //edit data
     $set = DBmain::mixingforupdatequery($datafields, $tablefields);
     try {
         $sql = "UPDATE " . $tablename . " SET " . $set . " " . $condition . "";
         // use exec() because no results are returned
         $this->conn->exec($sql);
     } catch (PDOException $e) {
         echo $sql . "<br>" . $e->getMessage();
     }
     $conn = null;
 }