public static function addProduct($obj_Product)
 {
     $db = config::dbconfig();
     $obj_retresult = new returnResult();
     $obj_Product->ProductId = DAL_manageProduct::getLastProductId() + 1;
     $sql = "INSERT INTO tbl_product (ProductId,ProductName,ExpireDuration,Description) \n\t\tVALUES (" . common::noSqlInject($obj_Product->ProductId) . "," . "'" . common::noSqlInject($obj_Product->ProductName) . "'" . "," . "'" . common::noSqlInject($obj_Product->ExpireDuration) . "'" . "," . "'" . common::noSqlInject($obj_Product->Description) . "'" . ");";
     $rs = mysql_query($sql);
     if (mysql_affected_rows() > 0) {
         $obj_retresult->type = 1;
         $obj_retresult->msg = "success";
         $obj_retresult->data = $obj_Product;
     } else {
         $obj_retresult->type = 0;
         $obj_retresult->msg = "failed";
     }
     return $obj_retresult;
 }