Question

我在将列集更新为主键时遇到问题，即使我在更新集默认

上进行了更新

这是我创建表的代码，我设置了更新集默认

create table department(
id int default 10 primary key,
name varchar(50)
);

create table employee
(
id int primary key,
dept_id int default 40 foreign key references department(id) on update set default on delete set default,
    name varchar(40)
);

之后，我将数据插入表

insert into department
values
(1,'hr'),
(2,'programming'),
(3,'telesales'),
(4,'database')

insert into employee
values
(1,1,'mohammed'),
(2,2,'magd'),
(3,1,'soha'),
(4,3,'sameh'),
(5,4,'ashraf')

但是，当我运行此代码来更新列id

时

update department
set id = 44 where id = 4

我收到了这个错误

The UPDATE statement conflicted with the FOREIGN KEY constraint "FK__employee__dept_i__571DF1D5". The conflict occurred in database "test", table "dbo.department", column 'id'.
The statement has been terminated.

但我不知道我的错在哪里！

感谢

Answer 1

在外键约束中使用ON UPDATE CASCADE，如下所示：

    create table employee
(
id int primary key,
dept_id int default 40 foreign key references department(id) on update cascade on delete set default,
    name varchar(40)
);

如果id列值有任何更新，dept_id也会更新以跟随更改后的值。

Answer 2

由于employee表格dept_id列 *约束* ，id列department。更新表的主键时会遇到此错误，但是来自另一个表的外键引用该错误，并且特定于更新的设置为“无操作”。 No操作是默认选项。

如果是这种情况并且未对更新操作设置操作，则可以将外键定义更改为Cascade

你可以试试这个：

ALTER TABLE employee
DROP Constraint FK__employee__dept_i__571DF1D5
GO

ALTER TABLE employee
ADD CONSTRAINT New_FK_Constraint
FOREIGN KEY (dept_id) REFERENCES department (id)
ON DELETE CASCADE ON UPDATE CASCADE
GO

Answer 3

通常会出现该错误，您有一个外键关系，然后您更改该值。

在外键约束中使用ON UPDATE CASCADE

Answer 4

如果不想更改表结构，可以运行以下查询：

ALTER TABLE [UserStore] 
NOCHECK CONSTRAINT FK_UserStore_User_UserId

ALTER TABLE [UserIdentity]
NOCHECK CONSTRAINT  FK_UserIdentity_User_UserId

BEGIN TRAN

UPDATE  [user] 
SET Id = 10
WHERE Id = 9

UPDATE  [dbo].[UserStore]
SET UserId = 10
WHERE UserId = 9

UPDATE  [dbo].UserIdentity
SET UserId = 10
WHERE UserId = 9

COMMIT TRAN

ALTER TABLE [UserStore] 
CHECK CONSTRAINT FK_UserStore_User_UserId

ALTER TABLE UserIdentity 
CHECK CONSTRAINT FK_UserIdentity_User_UserId

update语句与外键约束冲突

4 个答案: