Consider two tables Bill and Product with a many to many relationship. How do you get all the bills for a particular product using Entity Sql?
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):
问题:
回答1:
You need to use some linq like this;
...
using (YourEntities ye = new YourEntities())
{
Product myProduct = ye.Product.First(p => p.ProductId = idParameter);
var bills = myProduct.Bill.Load();
}
...
This assumes that you have used the entitiy framework to build a model for you data. The bills variable will hold a collection of Bill objects that are related to your product object.
Hope it helps.
回答2:
Something like this
SELECT B FROM [Container].Products as P
OUTER APPLY P.Bills AS B
WHERE P.ProductID == 1
will produce a row for each Bill
Another option is something like this:
SELECT P, (SELECT B FROM P.Bills)
FROM [Container].Products AS P
WHERE P.ProductID == 1
Which will produce a row for each matching Product (in this case just one) and the second column in the row will include a nested result set containing the bills for that product.
Hope this helps
Alex