實體框架-代碼優先-沒有共享主鍵時的實體拆分

Question

我有一個具有以下表的現有數據庫：

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

我有一個Address域類，如下所示：

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;}
}

我想先進行代碼嘗試，看看是否可以在保存時拆分Address域類，以便將數據持久保存到適當的表中。 由於CustomerAddress和Address表不共享公共密鑰，因此並非如此。 我能想到的唯一方法是先創建一組特定於代碼的類，然后將其映射回我的Address域類。

有什么方法可以實現實體拆分而無需創建其他代碼優先的特定類？

Answer 1

您需要的是兩個表之間的關系。 您應該按以下方式對表進行建模：

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;}
}