使用触发器实现两个数据库同步

if object_id('TABLE_1') is not null drop table TABLE_1

CREATE TABLE TABLE_1

(

ID INT primary key,

Name1 nchar(10),

Name2 nchar(10)

)

if object_id('TABLE_2') is not null drop table TABLE_2

CREATE TABLE TABLE_2

(

ID INT primary key,

Name1 nchar(10),

Name2 nchar(10)

)

INSERT INTO Table_1 VALUES(1,'adsd','Chi')

INSERT INTO Table_1 VALUES(2,'xiao','Chi')

INSERT INTO Table_2 VALUES(1,'Lei','Chi')

INSERT INTO Table_2 VALUES(2,'Alex','Chi')

if exists (select name

from sysobjects

where name = 'tr_info'

and type = 'tr')

drop trigger tr_info

go

create trigger tr_info on TABLE_2

for insert,update,delete

as

begin

if exists(select 1 from inserted) and not exists(select 1 from deleted)

begin

insert into Table_1 select * from inserted

end

else if exists(select 1 from inserted) and exists(select 1 from deleted)

begin

update b1

set b1.Name1=U.Name1,b1.Name2=U.Name2

from Table_1 b1,deleted U

where b1.ID=U.ID

end

else

begin

delete Table_1 where ID=(select ID from deleted)

end

end

--插入测试

INSERT INTO Table_2 VALUES(3,'huguo','Chi')

select * from TABLE_1

select * from TABLE_2

--删除测试

delete from Table_2 where ID=3

select * from TABLE_1

select * from TABLE_2

--更新测试

update Table_2 set Name1='ALex2' where ID=2

select * from TABLE_1

select * from TABLE_2