自動記錄資料庫儲存過程的更新和改變，併產生日誌
一、 簡介
使用環境：SQL Server
在專案開發過程中，專案管理者通常都很希望對專案的開發進展有一個日誌的記錄。程式碼的記錄和管理可以通過TFS或者VSS等工具去管理。但是資料庫卻沒有記錄開發日誌這一功能。這在實際開發中很不方便，特別是大量的儲存過程改動。
那麼針對這一個需求，在資料庫中定時執行一個Job，讓其自動記錄儲存過程的改動，以完成對資料庫儲存過程改動的一個記錄。
二、 實際效果
| 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、 實現原理
由於資料庫中所有的儲存過程程式碼都記錄在系統表Sys_comments中，所以我們可以通過比較不同時間點程式碼的方式去實現記錄一定時間範圍內的儲存過程變化。
比如：在今天早上01：00我們把所有儲存過程程式碼從系統表中取出，並記錄。然後到明天早上再重複這一過程，將兩次取出的不同結果進行比較，取出有變化的儲存過程並記錄，認為這些儲存過程在這一時間範圍記憶體在更新。
四、 實現程式碼
其實原理很簡單，就是一個迴圈比較的方式，所以也不需要大費周章的去介紹了，那麼下面就把實現相關的程式碼和流程貼出來。
1建立資料表
在資料庫建立三張表，sps_old, sps_new, sps_log。
Sps_old：記錄前一次系統中所有儲存過程程式碼，以備比較
Sps_new：當前所有儲存過程的程式碼，與sps_log_old中的資料比較
Sps_log：記錄在兩個時間點範圍內變化的儲存過程名字和變化時間
表結構：
/****** 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建立進行比較用的儲存過程，並記錄結果集
/*------------------------------------------------------------------------------------------------------
-- 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<[email protected]_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 [email protected]
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建立一個儲存過程從sps_log中獲取指定時間內的資料
/*
-- 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、 實際應用和配置
在資料庫中新建一個Job，程式碼為exec sps_log_add，一般執行可以設定為每天的零晨，一天一次比較合理，這樣便能把每天做的改動記錄下來。
六、 檢視日誌
直接執行儲存過程exec sps_log_get ‘2007-11-01’,’2007-11-30’。便能檢視所有在這一段時間內的儲存過程變化。