Question

我在代码第一种方法中对现有模式有标准的每表类型继承情况：

[Table("base_object")]
public partial class BaseObject
{
  public BaseObject()
  { 

  }

  [Key]
  [Column("id")]
  public long Id {get; set;}
  [Column("slug")]
  public string Slug {get; set;}
  ...       
}

[Table("user")]
public partial class User: BaseObject
{
  public User()
  {

  }

  [Column("login")]
  public string Login {get; set;}
  [Column("email")]
  public string Email {get; set;}
}

如注释中所述，映射很简单，user.id是base_object.id的主键和外键

在测试用例中，在第一次从Context调用“Users”存储库时，EF正在生成查询：

SELECT 
1 AS [C1], 
'0X0X' AS [C2], 
[Extent1].[id] AS [id], 
[Extent2].[slug] AS [slug], 
[Extent1].[login] AS [login], 
[Extent1].[email] AS [email], 
[Extent1].[BaseObject_id] AS [BaseObject_id]
FROM  [dbo].[user] AS [Extent1]
INNER JOIN [dbo].[base_object] AS [Extent2] ON [Extent1].[id] = [Extent2].[id]

这会产生错误，因为列“user.BaseObject_id”不存在！ Whitout这一行：* [Extent1]。[BaseObject_id] AS [BaseObject_id] *查询没问题。

我做错了什么？

我正在使用带有.NET 4.0的EF5.0

Answer 1

原来，“......”产生了不同。

BaseObject有一个集合：

[InverseProperty("Object")]
public virtual ICollection<UserHasObjectRight> UserHasObjectRights { get; set; }

User有一个集合：

[InverseProperty("User")]
public virtual ICollection<UserHasObjectRight> UserHasObjectRights { get; set; }

这导致奇怪的查询生成。我必须从基础对象类中删除重复的集合，它开始工作。

EF 5.0 table-per-type继承提供了奇怪的查询

1 个答案: