Question

我正在尝试使用EF代码首先使用Fluent配置为所有业务类实现“Party”域模式。配置让我喝酒（不是坏事，但下一站是悬崖）

我希望发生的事情类似于下面显示的代码。数据库的要求是我最终得到以下表格：

单独的“缔约方”表一个单独的“人”表一个单独的“组织”表

人员表与缔约方表有一对一的关系，即在您有人之前必须有一个缔约方。

组织表与缔约方表有一对一的关系，即在组建组织之前必须有一个缔约方。

并且，所有业务对象都从一个不应该在数据库中结束的BusinessObject基类继承，即仅属性继承。

我想使用“EntityTypeConfiguration”类使用Code First / Fluent API方法，即我有以下用于配置的类：

用于设置配置的上下文类。
每个业务对象的各个配置类，即PersonConfiguration，OrganizationConfiguration等

有谁可以帮助我如何为这种情况定义Fluent配置？或者给我一个例子？

谢谢！（以下代码）

PSEUDO CODE ............................................. ......................

// Business Obsject Base Class
// Should not be implemented as a database table!!!!
// No Primary Key Needed Here
public abstract class BusinessObject  
{  
   private List<BusinessRule> _businessRules = new List<BusinessRule>();  
   public List<BusinessRule> BusinessRules  
   {
     get { return _businessRules; }
   }

   private List<string> _validationErrors = new List<string>();
   public List<string> ValidationErrors
   {
     get { return _validationErrors; }
   }

   public DateTime CreatedDate { get; set; }
   public Person CreatedBy { get; set; }
   public ModifiedDate { get; set; }
   public Byte[] RowVersion { get; set; }
}

// Party Pattern Base Class inherits BusinessObject base class
// Shared Basis for People and Organizations
public abstract class Party : BusinessObject
{
   public virtual int PartyId { get; set; }
   public abstract string DisplayName { get; internal set; }
}

// Is a Party, Implements both BusinessObject base and Party base
public class Person : Party
{
   // Both a Primary and a Foreign Key
   // Should be a one-to-one relationship with Party
   //would like this to be "PersonId" not "PartyId" but it's OK if it is not
   public int PersonId { get; set; }  

   pubilc virtual string FirstName { get; set; }
   public virtual string LastName { get; set; }

   public override string DisplayName
   {
     get {  return LastName + ", " + FirstName;  }

     internal set { }
   }
}

// Is a Party, Implements both BusinessObject base and Party base
public class Organization : Party
{
  // Both a Primary and a Foreign Key
  // Should be a one-to-one relationship with Party
  //would like this to be "PersonId" not "PartyId" but it's OK if it is not
  public int OrganizationId { get; set; }

  pubilc virtual string Name { get; set; }

  public override string DisplayName
  {
    get {  return Name;  }

    internal set { }
  }
}

Answer 1

非常棘手的问题我认为您正在寻找的是实现TPT（Table Per Type）继承。我怀疑EF不会满足你的一些要求。有关更多信息，请访问以下链接：
Entity Framework + Multilevel Inheritance + EF Code first http://weblogs.asp.net/manavi/archive/2010/12/28/inheritance-mapping-strategies-with-entity-framework-code-first-ctp5-part-2-table-per-type-tpt.aspx

实体框架4代码第一流畅的API配置与一对一的继承关系

1 个答案: