Question

我要简化数据库。
这是它的样子：

表：

Main: Products: ID, Ref, Price, 
Translation: ID, Product_ID, Language_ID, Name
Images: ID, Product_ID, Path, Index

我是linq的新手，我尝试检索所有产品，其名称为language_ID = 1，图像为index = 1

From p In db.Products 
Join t In db.Translate_Products On p.ID_Product Equals t.Product_ID 
Join i In db.Images On p.ID_Product Equals i.Product_ID 
Where t.Language_ID = 1 And i.Index= 0 
Select p, t, i

Answer 1

From p In db.Products 
Join t In db.Translate_Products On p.ID_Product equals t.Product_ID into results1
from r1 in results.DefaultIfEmpty()
Join i In db.Images On p.ID_Product equals i.Product_ID 
into results2
from r2 in results2.DefaultIfEmpty()
Where results.Language_ID = 1 And i.Index= 0 
Select new
{

Productid = p.Productid,
..
..
..
}

Answer 2

From p In db.Products 
Join t In db.Translate_Products On p.ID_Product equals t.Product_ID 
into results1
from r1 in results1.DefaultIfEmpty()
Join i In db.Images On p.ID_Product equals i.Product_ID     
Where t.Language_ID == 1 And i.Index== 0 
Select new
{

Productid = p.Productid,
..
..
..
}

怎么做（简单？）linq查询

2 个答案: