使用触发器操作表1(添加，更新，删除) 同步实现表2的操作

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_2 VALUES(1,'Lei','Chi')
INSERT INTO Table_2 VALUES(2,'Alex','Chi')



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)--insert触发器
begin
insert into Table_1 select * from inserted
end
else if exists(select 1 from inserted) and exists(select 1 from deleted)--update触发器

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

ID Name1 Name2
----------- ---------- ----------
1 adsd Chi
2 Alex Chi
3 huguo Chi

(3 行受影响)

--删除测试
delete from Table_2 where ID=3

ID Name1 Name2
----------- ---------- ----------
1 adsd Chi
2 Alex Chi

(2 行受影响)
--更新测试

select * from Table_2

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

ID Name1 Name2
----------- ---------- ----------
1 adsd Chi
2 ALex2 Chi

(2 行受影响)