Question

由于我的数据库设置方式（我无法控制），我有一个我在实体框架中无法弄清楚的外键情况。我正在使用Fluent API来配置我的关系。我的课程是

public class Parent
{
   // Unique primary key
   public int PrimaryKey { get; set; }

   // These two fields together compose the foreign key to join to Child
   public string ParentForeignKey1 { get; set; }
   public string ParentForeignKey2 { get; set; }

   public List<Child> Children { get; set; }
}

public class Child
{
   // Unique primary key
   public int PrimaryKey { get; set; }

   // These two fields together compose the (non-unique) foreign key to join to Parent
   public string ChildForeignKey1 { get; set; }
   public string ChildForeignKey2 { get; set; }

   // The parent/child relationship is implicit, even though the tables
   // themselves indicate a many-to-many relationship
   public List<Parent> Parents { get; set; }
}

实体框架关系应该是这两个表加入ParentForeignKey和ChildForeignKey字段，如

SELECT * 
FROM Parent 
JOIN Child 
 ON  Child.ChildForeignKey1 = Parent.ParentForeignKey1
 AND Child.ChildForeignKey2 = Parent.ParentForeignKey2

如何设置Fluent API外键映射，以便在查询DbSet时实体框架生成这些连接？

Answer 1

我认为这更有意义

public class Parent
{
   // The parent/child relationship is implicit, even though the tables
   // themselves indicate a many-to-many relationship
   public static List<Parent> Parents { get; set; }


   // Unique primary key
   public int PrimaryKey { get; set; }

   // These two fields together compose the foreign key to join to Child
   public string ParentForeignKey1 { get; set; }
   public string ParentForeignKey2 { get; set; }

   public List<Child> Children { get; set; }
}

public class Child
{
   // Unique primary key
   public int PrimaryKey { get; set; }

   // These two fields together compose the (non-unique) foreign key to join to Parent
   public string ChildForeignKey1 { get; set; }
   public string ChildForeignKey2 { get; set; }

}

非标准命名的非唯一外键

1 个答案: