--觸發器記錄表某一個字段資料變化的日志 包括插入insert 修改update 删除delete 操作 2013-6-18
-- 建測試表
USE [pratice]
GO
create table sto
(id int not null, -- 主鍵字段
de datetime -- 被跟蹤的字段
constraint pk_sto primary key(id)
)
-- 建日志表
create table log_sto
(logid int not null identity(1,1), -- 日志序号(日志主鍵)
operate varchar(10), -- 操作類型 如Insert,Update,Delete.
id int, -- 原表ID(主鍵)
old_de datetime, -- de字段舊值
new_de datetime, -- de字段新值
spid int not null, -- spid
login_name varchar(100), -- 登入名
prog_name varchar(100), -- 程式名
hostname varchar(100), -- 主機名
ipaddress varchar(100), -- IP位址
runsql varchar(4000), -- 執行的TSQL代碼
UDate datetime -- 操作日期時間
constraint pk_logsto primary key(logid)
-- 建跟蹤觸發器
create trigger tr_sto
on sto after update,insert,delete
as
begin
declare @di table(et varchar(200),pt varchar(200),ei varchar(max))
insert into @di exec('dbcc inputbuffer(@@spid)')
declare @op varchar(10)
select @op=case when exists(select 1 from inserted) and exists(select 1 from deleted)
then 'Update'
when exists(select 1 from inserted) and not exists(select 1 from deleted)
then 'Insert'
when not exists(select 1 from inserted) and exists(select 1 from deleted)
then 'Delete' end
if @op in('Update','Insert')
begin
insert into log_sto
(operate,id,old_de,new_de,spid,login_name,prog_name,hostname,ipaddress,runsql,UDate)
select @op,n.id,o.de,n.de,@@spid,
(select login_name from sys.dm_exec_sessions where session_id=@@spid),
(select program_name from sys.dm_exec_sessions where session_id=@@spid),
(select hostname from sys.sysprocesses where spid=@@spid),
(select client_net_address from sys.dm_exec_connections where session_id=@@spid),
(select top 1 isnull(ei,'') from @di),
getdate()
from inserted n
left join deleted o on o.id=n.id
end
else
insert into log_sto
(operate,id,old_de,new_de,spid,login_name,prog_name,hostname,ipaddress,runsql,UDate)
select @op,o.id,o.de,null,@@spid,
(select login_name from sys.dm_exec_sessions where session_id=@@spid),
(select program_name from sys.dm_exec_sessions where session_id=@@spid),
(select hostname from sys.sysprocesses where spid=@@spid),
(select client_net_address from sys.dm_exec_connections where session_id=@@spid),
(select top 1 isnull(ei,'') from @di),
getdate()
from deleted o
end
go
--> 測試DML操作
-- 操作1
insert into sto(id,de) values(1,'2012-01-01 05:06:07')
-- 操作2
insert into sto(id,de) values(2,'2012-01-01 06:06:07')
-- 操作3
update sto set de=getdate() where id=2
-- 操作4
update sto set de=getdate() where id=1
-- 操作5
insert into sto(id,de) values(3,'2012-01-01 15:26:37')
-- 操作6
delete sto where id=2
SELECT * FROM log_sto
View Code
改進版本:1、隻記錄Update字段時，新老值不一緻情況。注意NULL是不能進行比較。需要用到Isnull進行轉換後，方可進行比較操作。
ALTER trigger tr_sto
declare @di table(et NVARCHAR(max),pt NVARCHAR(max),ei NVARCHAR(max))
if @op ='Update'
--IF UPDATE(de) --關鍵字段發生表更記錄。
--BEGIN
BEGIN
insert into log_sto
(operate,id,old_de,new_de,spid,login_name,prog_name,hostname,ipaddress,runsql,UDate)
select @op,n.id,o.de,n.de,@@spid,
(select login_name from sys.dm_exec_sessions where session_id=@@spid),
(select program_name from sys.dm_exec_sessions where session_id=@@spid),
(select hostname from sys.sysprocesses where spid=@@spid),
(select client_net_address from sys.dm_exec_connections where session_id=@@spid),
(select top 1 isnull(ei,'') from @di),
getdate()
from inserted n
left join deleted o on o.id=n.id
WHERE ISNULL(o.de,'')<>ISNULL(n.de,'') --隻記錄修改字段old值和new值不一樣的情況。
--WHERE CHECKSUM(o.de)<>CHECKSUM(n.de)
END
--end
ELSE if @op ='Insert'