使用SQLServer2000創建臨時Job異步執行SQL腳

應用場景：
在龐大的數據庫中很多複襍的更新查詢非常的耗時。爲了避免用戶長時間的等待，那些耗時的操作可以採用異步執行的方法，立刻返廻執行信息給用戶，同時在數據庫後台執行操作，等到執行完畢再更新數據表。

開發環境：
SQL SERVER2000 .NET

解決方案：
在SQL SERVER2000中創建一個臨時的Job，（或者固定的Job，根據具躰的應用場景），傳遞需要執行的SQL batch腳本，然後啓動這個Job。這樣就可以在數據庫獲得異步調用的功能了。由於創建的是臨時的Job，
SQL SERVER在該Job運行結束以後會自動刪除該Job。

缺點：該存儲過程必須指定數據庫的名字

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CREATE Procedure dbo.AsynchronousInvoking
@EXECSQL nvarchar(4000)
AS
BEGIN TRANSACTION
DECLARE @JobID BINARY(16)
DECLARE @ReturnCode INT
SELECT @ReturnCode = 0
BEGIN
-- Add the job
EXECUTE @ReturnCode = msdb.dbo.sp_add_job @job_id = @JobID OUTPUT ,
@job_name = N’temp_sqljob’,
@owner_login_name = N’’,
@description = N’description for job’, -- the description of the job
@category_name = N’[Uncategorized (Local)]’,
@enabled = 1,
@notify_level_email = 0,
@notify_level_page = 0,
@notify_level_netsend = 0,
@notify_level_eventlog = 0,
@delete_level= 3

IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback
-- Add the job steps
EXECUTE @ReturnCode = msdb.dbo.sp_add_jobstep @job_id = @JobID,
@step_id = 1,
@step_name = N’step1’,
@command = @EXECSQL, -- sql batch
--缺點：該存儲過程必須指定數據庫的名字
@database_name = N’your_database_name’, --the database name of the job to manipulate
@server = N’’,
@database_user_name = N’appuser’,
@subsystem = N’TSQL’,
@cmdexec_success_code = 0,
@flags = 0,
@retry_attempts = 0, --execute once only
@retry_interval = 0,
@output_file_name = N’’,
@on_success_step_id = 0,
@on_success_action = 1, -- on success abort
@on_fail_step_id = 0,
@on_fail_action = 2 -- on fail abort

IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback

--set the star step id of the job
EXECUTE @ReturnCode = msdb.dbo.sp_update_job @job_id = @JobID,
@start_step_id = 1
IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback

-- Add the Target Servers
EXECUTE @ReturnCode = msdb.dbo.sp_add_jobserver @job_id = @JobID,
@server_name = N’(local)’

IF (@@ERROR <> 0 OR @ReturnCode <> 0) GOTO QuitWithRollback

END

COMMIT TRANSACTION
GOTO EndSave

QuitWithRollback:
IF (@@TRANCOUNT > 0) BEGIN
ROLLBACK TRANSACTION
RETURN 1
END
EndSave:

--star the job immediately
EXEC @ReturnCode = msdb.dbo.sp_start_job @job_id = @JobID

--return to the invoker immediately
RETURN @ReturnCode
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO