private void OnRecvPlayerAttribute(IChannel channel, Message message)
        {
            Console.WriteLine("OnRecvPlayerAttribute");
            CPlayerAttribute request = message as CPlayerAttribute;
            Player           player  = (Player)channel.GetContent();
            ConnectDB        connect = new ConnectDB();

            // resolve message
            int intelligence = request.intelligence;
            int speed        = request.speed;
            int attack       = request.attack;
            int defense      = request.defense;

            Console.WriteLine("palyer attribute: " + speed + intelligence + attack + defense);

            // modify player's attribute
            player.intelligence = intelligence;
            player.speed        = speed;
            player.attack       = attack;
            player.defense      = defense;

            // modify database
            int result = connect.UpdatePlayerAttribute(player.user, speed, intelligence, attack, defense);

            if (result == 0)
            {
                Console.WriteLine("Update player attribute failure.");
            }
        }