SQLServer 触发器 数据库进行数据备份

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 @id<>0 
  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

相关推荐