varturnover_data=conn.QueryFirstOrDefault<AutoTurnOver.Models.dc_auto_turnover>(" select * from dc_auto_turnover where id=@id ",new{id=item});
// 检查是否已经存在数据
varnew_turnover_data_count=conn.QueryFirstOrDefault<int>(" select count(1) from dc_auto_turnover where warehouse_code=@warehouse_code and bailun_sku=@bailun_sku ",new