สอบถามเรื่องการใช้ฟังก์ชั่น mysql_real_escape_string

 class myODBC {
        var $_conn;
        function __construct($datasource,$username="",$password=""){
            $this->_conn = odbc_connect($datasource,$username,$password,SQL_CUR_USE_ODBC);
            $this->setCollation();
        }
		/**** function connect to database ****/

        function query($query,$debug = false){
            $dataset = array();
            $query = iconv($this->_collation2,$this->_collation1,$query);
            $result = odbc_exec($this->_conn,$query);
            while($row = @odbc_fetch_array($result)){
                $item = array();
                foreach($row as $key => $data){
                    $datax = iconv($this->_collation1,$this->_collation2,$data);
                    $item[$key] = $datax;
                }
                $dataset[] = $item;
            }
            if($debug){
                echo $query;
            }
            return $dataset;
        }

        function setCollation($collation1 = "UTF-8",$collation2 = "UTF-8"){
            $this->_collation1 = $collation1;
            $this->_collation2 = $collation2;
        }

        function close (){
            odbc_close($this->_conn);
        }
    }

$odbc->query("
				INSERT INTO train(
					reason ,
					objective ,
					target ,
					period ,
					place ,
					detail ,
					method ,
					cost ,
					train_result ,					
					date_edit,
					admin_id ,
					train_status
					)
				VALUES 	(
					'{$txt_reason}' ,
					'{$txt_objective}' ,
					'{$txt_target}' ,
					'{$txt_period}' ,
					'{$txt_place}' ,
					'{$txt_detail}' ,
					'{$txt_method}' ,
					".($txt_cost == '' ? 0 : $txt_cost)." ,
					'{$txt_result}' ,					
					'{$hid_date}' ,
					'{$admin_id}' ,
					'{$status}' 
					)						 
			");