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我有 3 个表：Application、Control 和 Application Control，这基本上是 Application 和 Control 之间的多对多关系。

应用表

App_ID int (PK)
.....

应用控制表

FK_APP_ID int (PK)
FK_Controls_ID (PK)

和控制表

ID int (PK)
Name varchar(50)

App 和 Control 表都填充了一些条目。当我尝试在 ApplicationControl 表中插入一个条目时（从 App 获取一个 ID，从 Control 获取一个 ID），它说：

The Insert statement conflicted with the FOREIGN KEY constraint 
(between ApplicationControl and Control) The conflict occured in table Control,
column ID.

任何想法为什么？它可以插入Application ID，但不能插入Control ID，这两种关系之间没有任何区别。

USE [PicknickDB]
GO

/****** Object:  Table [dbo].[ApplicationControl]    Script Date: 7/10/2013 3:21:29 PM  ******/ 
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[ApplicationControl](
[FK_App_ID] [int] NOT NULL,
[FK_Controls_ID] [int] NOT NULL,
CONSTRAINT [PK_ApplicationControl] PRIMARY KEY CLUSTERED 
(
[FK_App_ID] ASC,
[FK_Controls_ID] ASC
 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF,      ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
 ) ON [PRIMARY]

 GO

 ALTER TABLE [dbo].[ApplicationControl]  WITH CHECK ADD  CONSTRAINT       [FK_MapAppControls_Applications] FOREIGN KEY([FK_App_ID])
REFERENCES [dbo].[Application] ([App_ID])
ON UPDATE CASCADE
ON DELETE CASCADE
GO

ALTER TABLE [dbo].[ApplicationControl] CHECK CONSTRAINT   [FK_MapAppControls_Applications]
GO

ALTER TABLE [dbo].[ApplicationControl]  WITH CHECK ADD  CONSTRAINT [FK_MapAppControls_Controls] FOREIGN KEY([FK_App_ID])
REFERENCES [dbo].[Control] ([ID])
ON UPDATE CASCADE
ON DELETE CASCADE
GO

ALTER TABLE [dbo].[ApplicationControl] CHECK CONSTRAINT [FK_MapAppControls_Controls]
GO
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2 回答 2

3 
ALTER TABLE [dbo].[ApplicationControl]  WITH CHECK ADD  CONSTRAINT 

[FK_MapAppControls_Controls] FOREIGN KEY([FK_App_ID]) --Really?

REFERENCES [dbo].[Control] ([ID])
ON UPDATE CASCADE
ON DELETE CASCADE

那么，FK_App_ID是同时作为table和table的引用Application 吗Control？

我建议应该FK_Controls_ID改为。

于 2013-07-10T14:49:50.320 回答
0

在这种情况下，最好打开 Profiler 并准确查看它试图插入的值。这可能会导致看到为什么会出现问题。我最有可能的猜测是，发送到第二个表的插入的值是 NULL，因为代码忘记设置它。

于 2013-07-10T14:44:45.710 回答