class Log
{
    public:
        void    encode(Encoder& encoder) const;
        int     decode(Decoder& decoder);
    private:
        std::string sql_cmd;
}

class LogHelper
{
public:
        static void LogItemChange(const GameShare::GameItem& item, const PackageChangeDetails& pcd);
        {
                Log log(get_item_change_sql(item,pcd);
                send_to_log_server();
        }


private:
        static std::string get_item_change_sql(const GameShare::GameItem& item, const PackageChangeDetails& pcd);
}