}

        /*添加,修改需调用此方法*/
        function Edit($sql,$params=array())
        {
            $bind=$this->conn->prepare($sql);
            $arrKeys=array_keys($params);
            foreach($arrKeys as $row)
            { // www.jbxue.com
                $bind->bindValue(":".$row,$params[$row]);

            }

            $a=$bind->execute() or die('sql error');
            return $a;
        }
    }
    $dbh =new DbHelpClass();