Entity Framework - Code First - 没有共享主键时的实体拆分

Question

我有一个包含下表的现有数据库：

Customer
   customer_id (PK)
   customer_name

Customer Address
   customer_address_id (PK)
   customer_id (FK)
   address_id (FK)
   address_type

Address
   address_id (PK)
   street
   city
   state
   country
   postal_code

我有一个地址域 class 如下：

public class Address {
   public int Id {get; set;}
   public int CustomerId {get; set;}
   public int AddressId {get; set;}
   public int AddressType {get; set;}
   public string Street {get; set;}
   public string City{get; set;}
   public string State{get; set;}
   public string Country{get; set;}
   public string PostalCode{get; set;}
}

我想尝试代码优先，看看我是否可以在保存时拆分地址域 class，以便将数据保存到适当的表中。由于 CustomerAddress 和 Address 表不共享公共键，因此这不是那么简单。我能想到的唯一方法是首先创建一组特定于代码的 classes 并将其映射回我的地址域 class.

有什么方法可以实现实体拆分而无需创建额外的代码优先特定 classes？

Answer 1

您需要的是两个表之间的关系。您应该按如下方式对表进行建模：

public class CustomerAddress {
   [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
   public int Id {get; set;}

   public int CustomerId {get; set;}

   [ForeignKey("CustomerId")]
   public Customer Customer

   public int AddressId {get; set;}

   [ForeignKey("AddressId")]
   public Address Address

   public int AddressType {get; set;}
}

public class Address {
   [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
   public int Id {get; set;}

   public string Street {get; set;}

   public string City{get; set;}

   public string State{get; set;}

   public string Country{get; set;}

   public string PostalCode{get; set;}
}

Entity Framework - Code First - 没有共享主键时的实体拆分

Entity Framework - Code First - Entity Splitting When There Is No Shared Primary Key

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