c# - EF6 不从数据库生成外键关联

Question

问题:

我正在尝试使用数据库优先方法创建 EF6 模型。简而言之，我有 2 个表 tblUser 和 tblMilkMan，它们在 UserID 列上具有外键关系。但是当我创建一个新的 EDMX 图并添加 2 个表时:

1. 我看不出其中的关系
2. 未创建任何导航属性

请告诉我我做错了什么!

数据库架构:

表格脚本:

CREATE TABLE [dbo].[tblMilkMan]
    (
      [RecordID] [INT] NOT NULL
                       IDENTITY(1, 1) ,
      [UserID] [INT] NOT NULL ,
      [IsMyTurn] [BIT] NOT NULL ,
      [RoundRobinOrder] [INT] NOT NULL
    )
ON  [PRIMARY]
GO
ALTER TABLE [dbo].[tblMilkMan] ADD CONSTRAINT [PK_tblMilkMan] PRIMARY KEY CLUSTERED  ([RecordID]) ON [PRIMARY]
GO
ALTER TABLE [dbo].[tblMilkMan] ADD CONSTRAINT [FK__MilkMan__User__UserID] FOREIGN KEY ([UserID]) REFERENCES [dbo].[tblUser] ([UserID]) ON DELETE CASCADE
GO

CREATE TABLE [dbo].[tblUser]
    (
      [UserID] [INT] NOT NULL
                     IDENTITY(1, 1) ,
      [LogonName] [VARCHAR](20) COLLATE SQL_Latin1_General_CP437_CI_AS
                                NOT NULL ,
      [Client] [CHAR](4) COLLATE SQL_Latin1_General_CP437_CI_AS
                         NOT NULL ,
      [Password] [VARCHAR](20) COLLATE SQL_Latin1_General_CP437_CI_AS
                               NOT NULL ,
      [PasswordExpires] [DATETIME] NULL ,
      [PasswordExpiresAfter] [INT] NOT NULL
                                   CONSTRAINT [DF_tblUser_PasswordExpiresAfter] DEFAULT ( 9999 ) ,
      [FirstName] [VARCHAR](20) COLLATE SQL_Latin1_General_CP437_CI_AS
                                NOT NULL ,
      [LastName] [VARCHAR](20) COLLATE SQL_Latin1_General_CP437_CI_AS
                               NOT NULL
    )
ON  [PRIMARY]
    WITH (
         DATA_COMPRESSION = ROW)

GO
ALTER TABLE [dbo].[tblUser] ADD CONSTRAINT [PK_tblUser] PRIMARY KEY CLUSTERED  ([UserID]) WITH (DATA_COMPRESSION = ROW) ON [PRIMARY]
GO
CREATE UNIQUE NONCLUSTERED INDEX [IX_tblUser] ON [dbo].[tblUser] ([UserID]) WITH (FILLFACTOR=90, DATA_COMPRESSION = ROW) ON [PRIMARY]
GO

EDMX 设计器 View :

对我没有帮助的相关链接:

• Why doesn't EF 4 generate association for FK relation to column with unique index?

• EF does not generate foreign key association from foreign key in table

环境:

• Visual Studio 旗舰版 2012
• SQL Server 2014
• EF6
• 网络 API2

Answer 1

问题出在下面一行 -

CREATE UNIQUE NONCLUSTERED INDEX [IX_tblUser] ON [dbo].[tblUser] ([UserID])
WITH (FILLFACTOR=90, DATA_COMPRESSION = ROW) ON [PRIMARY]
GO

我不知道同一列上有聚集索引和非聚集索引的原因。常见的最佳实践是创建主键作为聚集索引。 (Source)

如果您删除该非聚集索引，它将在 EDMX 中看到该关系。

如何删除它？