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第一种方法创建EF6模型。简单来说，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. 我没有看到这段关系
2. 未创建导航属性

请告诉我我做错了什么！

数据库架构：



表脚本：

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 Designer查看：



有关我帮助的相关链接：

• 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 Ultimate 2012
• SQL Server 2014
• EF6
• Web API2

Answer 1

问题是以下一行 -

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

我不知道在同一列上有Clustered和NonClustered索引的原因。常见的最佳做法是将主键创建为聚簇索引。 (Source)

如果删除 NONCLUSTERED INDEX ，则会在EDMX中看到该关系。

如何删除它？