SqlServer触发器 应用案例Demo数据同步场景

创建两张表 1 user   2 usercopy

两张表结构相同 ，如下图所示：

一：

--创建触发器userinsert1，当user表执行插入操作时，向usercopy表插入同样的数据
IF (
 object_id('userinsert1','tr') IS NOT NULL
) DROP TRIGGER userinsert1 ;go

CREATE TRIGGER userinsert1
ON
dbo.[user]
after
INSERT
AS
DECLARE @id INT,@name VARCHAR(100),@age VARCHAR(100);
--在inserted表中查询已经插入记录信息
SELECT @id = id,@name = name,@age = age FROM inserted;
INSERT usercopy (id,name,age) VALUES (@id,@name,'1212')

--测试插入数据在user表中，
INSERT dbo.[user] (id,age) VALUES ('2','test','22') ;

二：

--创建触发器userupdate1，当user表执行更新操作时，usercopy表同样更新数据

IF (
 object_id('userupdate1','tr') IS NOT NULL
) DROP TRIGGER userupdate1
go

CREATE TRIGGER userupdate1
ON
dbo.[user]
after
UPDATE
AS
DECLARE @id INT,@age VARCHAR(100);
--在inserted表中查询已经更新记录信息
SELECT @id = id,@age = age FROM inserted;
UPDATE usercopy set name = @name,age = @age where id = @id
 

--测试更新数据 在user表中
update dbo.[user] set name = 'name',age = '33' where id= '1';

三：

--创建触发器userdelete1，当user表执行删除操作时，usercopy表同样删除数据
IF (
 object_id('userdelete1','tr') IS NOT NULL
) DROP TRIGGER userdelete1
go

CREATE TRIGGER userdelete1
ON
dbo.[user]
after
DELETE
AS
DECLARE @id INT,@age VARCHAR(100);
--在deleted表中查询已经删除记录信息
SELECT @id = id,@age = age FROM deleted;
print @id
delete from dbo.[usercopy] where id = @id

-- 测试删除数据 在user表中
delete from dbo.[user] where id = '3'