当派生表使用其自己的主键时，如何在实体框架中按类型继承设置表？

Question

Suppose I have a table structure such as:

Order    
  ID int, primary key 
  Name, string
  OtherOrderFields...

RetailOrder
  ID int, primary key
  OrderID, foreign key
  RetailOrderFields...

In entity framework 4, is it possible to set up table per type inheritance so that RetailOrder derives from Order? All the examples I've seen so far have the derived class using the foreign key (OrderID in this example) as the primary key for the table, but what if that's not the case and each table maintains its own primary key?

Answer 1

No, it's impossible. I think, your database schema guess aggregation (1-1 relation) instead of inheritance.