复制代码 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));
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
复制代码 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
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：
复制代码 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
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：
复制代码 代码如下:
select * from test3
select * from test3_bak
select * from test3_bak
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