public function loginAction($params)
 {
     $db = new connection();
     $user_name = $params['user_name'];
     $tableName = $this->table_name;
     $password = $db->encodeData($params['password']);
     $rawQry = "SELECT * FROM `system_user` WHERE 1 and `flag`=0 and `user_name`='{$user_name}' and `password`='{$password}'";
     $res = $db->rawQry($rawQry);
     if ($res == true) {
         $sys_user = new SystemUserConrtoller();
         $user_data = $sys_user->selectAction($where = " `flag`=0 and `user_name`='{$user_name}' and `password`='{$password}'");
         $_SESSION['sys_user_id'] = $user_data[0]['sys_user_id'];
         $_SESSION['sys_user_name'] = $user_data[0]['sys_name'];
         $_SESSION['sys_role_id'] = $user_data[0]['sys_role_id'];
         header("Location:index.php");
     } else {
         $msg = "Invalid Username and Password!";
         return $msg;
     }
 }