实体框架5方法查询rollup
本文关键字:查询 rollup 方法 框架 实体 | 更新日期: 2023-09-27 18:04:51
我试图通过查询saleconconfirm表来获得已确认/最终购买的摘要,但是我在使用方法语法查询时遇到了很多困难。
数据库表
下面是存储最终销售额的salconfirm表结构。
Id OfferId ProdId Qty SaleDate
-------------------------------------------------------
10 7 121518 150 2013-03-14 00:00:00.000
19 7 100518 35 2013-03-18 14:46:34.287
20 7 121518 805 2013-03-19 13:03:34.023
21 10 131541 10 2013-03-20 08:34:40.287
- Id:唯一行Id。
- OfferId:链接到Offer/Sale的外键表。
- ProdId:产品在产品表中的ID。
- 数量:销售给客户的数量。
- SaleDate:完成销售的日期。
控制器动作
var confRollUps = db.SaleConfirmation
.GroupBy(c => c.OfferId) // Ensure we get a list of unique/distinct offers
.Select(g => g.Select(i => new {
i.OfferId,
i.Product.Variety, // "Category" of product, will be the same across products for this offer. i.Product is a SQL Server Navigation property.
i.Offer.Price, // The price of the product, set per offer. i.Offer is a SQL Server Navigation property.
i.Offer.Quantity, // The quantity of items that are expected to be sold before the offer expires
i.Offer.DateClose, // Date of when the offer expires
g.Sum(ii => ii.Qty) // Sum up the Qty column, we don't care about ProdIds not matching
}));
select查询中的错误是g。求和(ii => ii. qty),误差如下。
无效匿名类型成员声明符。匿名类型成员必须使用成员赋值、简单名称或成员访问来声明。
您只需要将匿名类型分配给一个变量,试试这个
var confRollUps = db.SaleConfirmation
.GroupBy(c => c.OfferId) // Ensure we get a list of unique/distinct offers
.Select(g => g.Select(i => new {
OfferId = i.OfferId,
ProductVariety = i.Product.Variety, // "Category" of product, will be the same across products for this offer. i.Product is a SQL Server Navigation property.
OfferPrice = i.Offer.Price, // The price of the product, set per offer. i.Offer is a SQL Server Navigation property.
OfferQty = i.Offer.Quantity, // The quantity of items that are expected to be sold before the offer expires
OfferDateClose =i.Offer.DateClose, // Date of when the offer expires
Total =g.Sum(ii => ii.Qty) // Sum up the Qty column, we don't care about ProdIds not matching
}));