地图弱实体先用code [英] Map weak entity by using Code first
问题描述
您好我已经开发了模型,完美的作品对我来说,现在我想用的EntityFramework它映射到数据库中,这里是其中的一部分:
Hi I have developed model that works perfectly for me, now I want to map it to database using EntityFramework, here is a part of it:
public class Product
{
public int Id { get; set; }
public string Name { get; set; }
public virtual ProductType Type { get; set; }
}
public class Supplier
{
public int Id { get; set; }
public string OIB { get; set; }
public string Name { get; set; }
}
public class SupplierProduct
{
public double Price { get; set; }
public string SupplierMark { get; set; }
public virtual Product Product { get; set; }
public virtual Supplier Supplier { get; set; }
}
现在我的问题是我怎么写模型构建实体配置形成我的DbContext,以便其映射在SupplierProduct类ForeignKeys Supllier.ID和Product.Id为DB关系的主键。
Now my question is how do I write entity configuration on ModelBuilder form my DBContext so that it maps on SupplierProduct class ForeignKeys Supllier.ID and Product.Id as Primary key of DB relation.
推荐答案
我用数据标注,但我希望你正在寻找以下内容:
I use data annotations, but I expect you're looking for the following:
为产品
和公司
在 SupplierProduct
,指定这些ID字段FK的,然后定义有两个ID字段复合主键
define ID properties for Product
and Supplier
in SupplierProduct
, specify these ID fields as FK's, then define compound primary key with the two ID fields
modelBuilder.Entity<SupplierProduct>()
.HasRequired( sp => sp.Product)
.WithMany( p => SupplierProducts )
.HasForeignKey( sp => sp.ProductId );
modelBuilder.Entity<SupplierProduct>()
.HasRequired( sp => sp.Supplier)
.WithMany( s => SupplierProducts )
.HasForeignKey( sp => sp.SupplierId );
modelBuilder.Entity<SupplierProduct>()
.HasKey(sp=> new { sp.ProductId, sp.SupplierId });
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