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HomeDatabaseMysql TutorialSQLServer 触发器 数据库进行数据备份

首先,你需要建立测试数据表,一个用于插入数据:test3,另外一个作为备份:test3_bak

代码如下:
  create table test3(id int primary key not null
  identity(1,1),uname varchar(20),uage int);
  create table test3_bak(id int primary key not
  null identity(1,1),bid int,uname varchar(20),
  uage int,active char(1));

  第二步,编写备份用的触发器,只有更新或者是插入的时候才触发
代码如下:
  alter trigger test3_bak_insert_update
  on test3
  for insert,update
  as
  declare @id int
  declare @uname varchar(20)
  declare @uage int
  begin
  select @id=id,@uname=uname,@uage=uage from inserted
  if @id0
  begin
  update test3_bak set active='0' where bid=@id
  insert into test3_bak(bid,uname,uage,active)
  values(@id,@uname,@uage,'1')
  end
  end

  第三步,测试数据:
代码如下:
  insert into test3(uname,uage) values('FLB',20)
  insert into test3(uname,uage) values('FLB1',21)
  insert into test3(uname,uage) values('FLB2',22)
  update test3 set uage=100 where id=27
  delete from test3 where id=20

  最后,你可自己采用下面方法查询跟踪两个表的数据变化:
代码如下:
  select * from test3
  select * from test3_bak
Statement
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