varold_data=conn.QueryFirstOrDefault<dc_base_prod_order>(" select * from dc_base_prod_order where `purchase_no`=@purchase_no and bailun_sku=@bailun_sku ",new
varold_data=conn.QueryFirstOrDefault<dc_base_prod_order>(" select * from dc_base_prod_order where `purchase_no`=@purchase_no and bailun_sku=@bailun_sku ",new