netIncome.id=MyMySqlConnection._connection.QueryFirstOrDefault<int?>(" select id from dc_base_amazon_fee where data_id=@data_id ",new{data_id=netIncome.data_id})??0;
//netIncome.id = MyMySqlConnection._connection.QueryFirstOrDefault<int?>(" select id from dc_base_amazon_fee where data_id=@data_id ", new { data_id = netIncome.data_id }) ?? 0;