转:自动记录数据库存储过程的更新和改变，并产生日志

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自动记录数据库存储过程的更新和改变，并产生日志

一、 简介
使用环境：SQL Server
在项目开发过程中，项目管理者通常都很希望对项目的开发进展有一个日志的记录。代码的记录和管理可以通过TFS或者VSS等工具去管理。但是数据库却没有记录开发日志这一功能。这在实际开发中很不方便，特别是大量的存储过程改动。

那么针对这一个需求，在数据库中定时执行一个Job，让其自动记录存储过程的改动，以完成对数据库存储过程改动的一个记录。

二、 实际效果

Sp_id	change_date	action_type	sp_name
755585830	2007-11-13	Added	Sp_a
451584747	2007-11-13	Update	Sp_b
2119014630	2007-11-13	Update	Sp_c
2119014630	2007-11-13	Update	Sp_d
771585887	2007-11-13	Deleted	Sp_e

三、 实现原理
由于数据库中所有的存储过程代码都记录在系统表Sys_comments中，所以我们可以通过比较不同时间点代码的方式去实现记录一定时间范围内的存储过程变化。
比如：在今天早上01：00我们把所有存储过程代码从系统表中取出，并记录。然后到明天早上再重复这一过程，将两次取出的不同结果进行比较，取出有变化的存储过程并记录，认为这些存储过程在这一时间范围内存在更新。
四、 实现代码
其实原理很简单，就是一个循环比较的方式，所以也不需要大费周章的去介绍了，那么下面就把实现相关的代码和流程贴出来。
1建立数据表



在数据库建立三张表，sps_old, sps_new, sps_log。
Sps_old：记录前一次系统中所有存储过程代码，以备比较
Sps_new：当前所有存储过程的代码，与sps_log_old中的数据比较
Sps_log：记录在两个时间点范围内变化的存储过程名字和变化时间
表结构：
/****** Sps_log ******/
CREATE TABLE [dbo].[sps_log](
[sp_id] [int] NULL,
[change_date] [datetime] NULL,
[action_type] [char](10) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[sp_name] [varchar](150) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
) ON [PRIMARY]
/****** Sps_new ******/----------------------------------------------------------------
CREATE TABLE [dbo].[sps_new](
[sp_id] [int] NULL,
[colid] [smallint] NULL,
[sp_name] [varchar](150) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[sp_content] [varchar](4000) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[record_date] [datetime] NULL
) ON [PRIMARY]
/******Sps_old******/-----------------------------------------------------------------------------------
CREATE TABLE [dbo].[sps_old](
[sp_id] [int] NULL,
[colid] [smallint] NULL,
[sp_name] [varchar](150) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[sp_content] [varchar](4000) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[record_date] [datetime] NULL
) ON [PRIMARY]
----------------------------------------------------------------------------------------------------------------
2建立进行比较用的存储过程，并记录结果集

/*------------------------------------------------------------------------------------------------------

-- Function : sps_log_add

-- Description : record all sps change log

--1 get all new sps (find sps which in new table not in old table)

--2 get all deleted sps (find sps which in old table not in new table)

--3 get all updated sps (find sps which in old talbe are not same in new table)

-- any change will record into sps_log table

------------------------------------------------------------------------------------------------------*/

CREATE procedure [dbo].[sps_log_add]

as

-- clear out sps_new

truncate table sps_new

-- fill into sps_new

insert into sps_new

(sp_id,colid,sp_name,sp_content,record_date)

select

a.id,

a.colid,

b.name,

a.[text],

getdate()

from

syscomments a

left join

sysobjects b

on a.id = b.id

where b.type='P' and b.name not like 'dt_%'

-- Find new sp

insert into

sps_log

select distinct

sp_id,

getdate(),

'Added',

sp_name

from

sps_new

where

sp_id not in (select distinct sp_id from sps_old)

-- Find deleted sp

insert into

sps_log

select distinct

sp_id,

getdate(),

'Removed',

sp_name

from

sps_old

where

sp_id not in (select distinct sp_id from sps_new)

-- compare existing sp

DECLARE @ProcID int

declare @count_new int

declare @count_old int

declare @text_new varchar(4000)

declare @text_old varchar(4000)

declare @name varchar(150)

declare @i int

DECLARE SearchProc CURSOR FOR

select distinct

sp_id

from

sps_new

where

sp_id in (select distinct sp_id from sps_old)

order by

sp_id

open SearchProc

FETCH NEXT FROM SearchProc

INTO @ProcID

WHILE @@FETCH_STATUS >=0

BEGIN

-- colid quantity

select @count_new=count(colid) from sps_new where sp_id = @ProcID

select @count_old=count(colid) from sps_old where sp_id = @ProcID

-- if count of colid is unequal, sp was updated.
if @count_new <> @count_old

begin

-- Record change

insert into sps_log(sp_id,change_date,action_type) values(@ProcID,getdate(),'Update')
end

else -- @count_new = @count_old, if count of colid is equal

begin

set @i=1 -- Reset Counter

while @i<=@count_new -- colid

begin

-- sp content

select @text_new = sp_content from sps_new
where sp_id = @ProcID and colid = @i
select @text_old = sp_content from sps_old

where sp_id = @ProcID and colid = @i
-- if content is different, sp was updated.
if @text_new <> @text_old

begin

-- Record change

select @name = [name] from sysobjects where id=@ProcID

insert into sps_log(sp_id,change_date,action_type,sp_name)

values(@ProcID,getdate(),'Update',@name)
end

set @i= @i+1 -- Counter + 1

end

end

FETCH NEXT FROM SearchProc

INTO @ProcID

END

CLOSE SearchProc

DEALLOCATE SearchProc

-- clear out sps_new

truncate table sps_old

-- fill into sps_old with sps_new

insert into sps_old select * from sps_new

----------------------------------------------------------------------------------------------------------------------

3创建一个存储过程从sps_log中获取指定时间内的数据

/*

-- Function : sps_log_get

-- Description : Show sps change in a period of time

*/

CREATE PROCEDURE [dbo].[sps_log_get]

@from_date datetime,

@to_date datetime

as

select

sp_name,

action_type,

CONVERT(varchar(10),change_date,102) as change_date

from

sps_log

where

change_date between @from_date and @to_date

group by

sp_name,action_type,CONVERT(varchar(10),change_date,102)

order by

CONVERT(varchar(10),change_date,102) asc

五、 实际应用和配置
在数据库中新建一个Job，代码为exec sps_log_add，一般运行可以设置为每天的零晨，一天一次比较合理，这样便能把每天做的改动记录下来。
六、 查看日志
直接运行存储过程exec sps_log_get ‘2007-11-01’,’2007-11-30’。便能查看所有在这一段时间内的存储过程变化。