--假设id是主键 create trigger tr_insert on test for insert as update a set item3=200 from test a,inserted i where a.id=i.id --and a.item3 is null --如果仅在没有给item3指定值时才更新,则加上此条件
--如果表中没有主键 create trigger tr_insert on test instead of insert as select * into # from inserted update # set item3=200 --where item3 is null --如果仅在没有给item3指定值时才更新,则加上此条件 insert test select * from #
Create Trigger [Updateitem3] ON test FOR INSERT AS Update A Set item3=200 from test A Inner Join Inserted B On A.id=B.id GO
create trigger tr_insert on test for insert as update a set item3=200 from test a inner inserted i on a.id=i.id
alter trigger UpdateItem3 on 表 for insert as update a set a.item3 = '200' from inserted b inner join 表 a on a.id = b.id
采用触发器同步不同服务器上数据 分布式事务的例子: 转: --用触发器即时同步两个表的实例:--测试环境:SQL2000,远程主机名:xz,用户名:sa,密码:无,数据库名:test--创建测试表,不能用标识列做主键,因为不能进行正常更新 --在远程主机上建表 if exists (select * from dbo.sysobjects where id = object_id(N'[test]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [test]create table test(id int not null constraint PK_test primary key ,name varchar(10)) go--以下操作在本机进行 --在本机上建表及做同步处理的工作 if exists (select * from dbo.sysobjects where id = object_id(N'[test]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [test]create table test(id int identity(1,1) primary key ,name varchar(10)) go--创建同步的触发器 create trigger t_test on test for insert,update,delete as set XACT_ABORT on --启动远程服务器的MSDTC服务 exec master..xp_cmdshell 'isql /S"xz" /U"sa" /P"" /q"exec master..xp_cmdshell ''net start msdtc'',no_output"',no_output--启动本机的MSDTC服务 exec master..xp_cmdshell 'net start msdtc',no_output--进行分布事务处理,如果表用标识列做主键,用下面的方法 BEGIN DISTRIBUTED TRANSACTION delete from openrowset('sqloledb','xz';'sa';'',test.dbo.test) where id in(select id from deleted) insert into openrowset('sqloledb','xz';'sa';'',test.dbo.test) select * from inserted commit tran go--插入数据测试 insert into test select 1,'aa' union all select 2,'bb' union all select 3,'c' union all select 4,'dd' union all select 5,'ab' union all select 6,'bc' union all select 7,'ddd'--删除数据测试 delete from test where id in(1,4,6)--更新数据测试 update test set name=name+'_123' where id in(3,5)--显示测试的结果 select * from test a full join openrowset('sqloledb','xz';'sa';'',test.dbo.test) b on a.id=b.id 注释 当 SET XACT_ABORT 为 ON 时,如果 Transact-SQL 语句产生运行时错误,整个事务将终止并回滚。为 OFF 时,只回滚产生错误的 Transact-SQL 语句,而事务将继续进行处理。编译错误(如语法错误)不受 SET XACT_ABORT 的影响。 在上面这种情况,必须设为ON
create trigger tr_insert on test
instead of insert
as
select * into # from inserted
update # set item3=200
--where item3 is null --如果仅在没有给item3指定值时才更新,则加上此条件
insert test select * from #
Create Trigger [Updateitem3] ON test
FOR INSERT
AS
Update A Set item3=200 from test A Inner Join Inserted B On A.id=B.id
GO
create trigger tr_insert
on test
for insert
as
update a
set item3=200
from test a
inner inserted i
on a.id=i.id
for insert
as
update a set a.item3 = '200'
from inserted b inner join 表 a on a.id = b.id
分布式事务的例子:
转:
--用触发器即时同步两个表的实例:--测试环境:SQL2000,远程主机名:xz,用户名:sa,密码:无,数据库名:test--创建测试表,不能用标识列做主键,因为不能进行正常更新
--在远程主机上建表
if exists (select * from dbo.sysobjects where id = object_id(N'[test]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [test]create table test(id int not null constraint PK_test primary key
,name varchar(10))
go--以下操作在本机进行
--在本机上建表及做同步处理的工作
if exists (select * from dbo.sysobjects where id = object_id(N'[test]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [test]create table test(id int identity(1,1) primary key
,name varchar(10))
go--创建同步的触发器
create trigger t_test on test
for insert,update,delete
as
set XACT_ABORT on
--启动远程服务器的MSDTC服务
exec master..xp_cmdshell 'isql /S"xz" /U"sa" /P"" /q"exec master..xp_cmdshell ''net start msdtc'',no_output"',no_output--启动本机的MSDTC服务
exec master..xp_cmdshell 'net start msdtc',no_output--进行分布事务处理,如果表用标识列做主键,用下面的方法
BEGIN DISTRIBUTED TRANSACTION
delete from openrowset('sqloledb','xz';'sa';'',test.dbo.test)
where id in(select id from deleted)
insert into openrowset('sqloledb','xz';'sa';'',test.dbo.test)
select * from inserted
commit tran
go--插入数据测试
insert into test
select 1,'aa'
union all select 2,'bb'
union all select 3,'c'
union all select 4,'dd'
union all select 5,'ab'
union all select 6,'bc'
union all select 7,'ddd'--删除数据测试
delete from test where id in(1,4,6)--更新数据测试
update test set name=name+'_123' where id in(3,5)--显示测试的结果
select * from test a full join
openrowset('sqloledb','xz';'sa';'',test.dbo.test) b on a.id=b.id
注释
当 SET XACT_ABORT 为 ON 时,如果 Transact-SQL 语句产生运行时错误,整个事务将终止并回滚。为 OFF 时,只回滚产生错误的 Transact-SQL 语句,而事务将继续进行处理。编译错误(如语法错误)不受 SET XACT_ABORT 的影响。
在上面这种情况,必须设为ON