下面我们通过插入两行数据测试触发器:
--清空所有数据 delete from UserExtent; delete from UserBase; create table #temp( name nvarchar(32), remark nvarchar(32) ) insert #temp (name,remark) values (N'user1', N'1'); insert #temp (name,remark) values (N'user2', N'2'); --插入两行数据 insert Users(name, remark) select name,remark from #temp drop table #temp select * from Users; select * from UserBase; select * from UserExtent;
执行结果如下:
创建更新触发器,与INSERT触发器类似,受影响的行会保存在inserted中,可以从inserted表中获取受影响的行,并更新UserBase,UserExtent,具体代码如下:
CREATE TRIGGER [dbo].[Users_Update] ON [dbo].[Users] INSTEAD OF UPDATE as update UserExtent set UserExtent.Remark=ins.Remark from inserted ins where UserExtent.ID = ins.ID; update UserBase set UserBase.Name=ins.Name from inserted ins where UserBase.ID = ins.ID;
测试代码:
--清空所有数据 delete from UserExtent; delete from UserBase; --插入两行数据 insert Users (name,remark) values (N'user1', N'1'); insert Users (name,remark) values (N'user2', N'2'); insert Users (name,remark) values (N'user3', N'2'); --修改后两行数据 UPDATE Users set Remark = N'3' where Remark = N'2' --输出数据 select * from Users; select * from UserBase; select * from UserExtent;
.csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; }
测试结果:
创建删除触发器,在删除的触发器中,可以通过deleted表,获取被删除的行,具体代码如下:
CREATE TRIGGER [dbo].[Users_Delete] ON [dbo].[Users] INSTEAD OF DELETE as delete from UserExtent where ID in (select ID from deleted) delete from UserBase where ID in (select ID from deleted)
测试代码:
--清空所有数据 delete from UserExtent; delete from UserBase; --插入两行数据 insert Users (name,remark) values (N'user1', N'1'); insert Users (name,remark) values (N'user2', N'2'); insert Users (name,remark) values (N'user3', N'2'); --删除后两行数据 delete from Users where Remark = N'2' --输出数据 select * from Users; select * from UserBase; select * from UserExtent;
.csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; }
运行结果:
(责任编辑:ken)