在SQL Server 2005以上版本中，在一个增强的WaitFor命令，其作用可以和一个job相当。但使用更加简捷。
看MSDN:
http://msdn.microsoft.com/zh-cn/library/ms187331.aspx
语法为：
WAITFOR
{
DELAY 'time_to_pass'
| TIME 'time_to_execute'
| [ ( receive_statement ) | ( get_conversation_group_statement ) ]
[ , TIMEOUT timeout ]
}
以下示例在晚上 10:20 (22:20) 执行存储过程 sp_update_job。
USE
msdb;
EXECUTE sp_add_job @job_name = ' TestJob ' ;
BEGIN
WAITFOR TIME ' 22:20 ' ;
EXECUTE sp_update_job @job_name = ' TestJob ' ,
@new_name = ' UpdatedJob ' ;
END ;
GO
EXECUTE sp_add_job @job_name = ' TestJob ' ;
BEGIN
WAITFOR TIME ' 22:20 ' ;
EXECUTE sp_update_job @job_name = ' TestJob ' ,
@new_name = ' UpdatedJob ' ;
END ;
GO
以下示例在两小时的延迟后执行存储过程。注意:Delay最多不超过24小时
BEGIN
WAITFOR DELAY ' 02:00 ' ;
EXECUTE sp_helpdb;
END ;
GO
WAITFOR DELAY ' 02:00 ' ;
EXECUTE sp_helpdb;
END ;
GO
以下示例显示如何对
WAITFOR DELAY 选项使用局部变量。将创建一个存储过程，该过程将等待可变的时间段，然后将经过的小时、分钟和秒数信息返回给用户。
USE
AdventureWorks2008R2;
GO
IF OBJECT_ID ( ' dbo.TimeDelay_hh_mm_ss ' , ' P ' ) IS NOT NULL
DROP PROCEDURE dbo.TimeDelay_hh_mm_ss;
GO
CREATE PROCEDURE dbo.TimeDelay_hh_mm_ss
(
@DelayLength char ( 8 ) = ' 00:00:00 '
)
AS
DECLARE @ReturnInfo varchar ( 255 )
IF ISDATE ( ' 2000-01-01 ' + @DelayLength + ' .000 ' ) = 0
BEGIN
SELECT @ReturnInfo = ' Invalid time ' + @DelayLength
+ ' ,hh:mm:ss, submitted. ' ;
-- This PRINT statement is for testing, not use in production.
PRINT @ReturnInfo
RETURN ( 1 )
END
BEGIN
WAITFOR DELAY @DelayLength
SELECT @ReturnInfo = ' A total time of ' + @DelayLength + ' ,
hh:mm:ss, has elapsed! Your time is up. '
-- This PRINT statement is for testing, not use in production.
PRINT @ReturnInfo ;
END ;
GO
/* This statement executes the dbo.TimeDelay_hh_mm_ss procedure. */
EXEC TimeDelay_hh_mm_ss ' 00:00:10 ' ;
GO
GO
IF OBJECT_ID ( ' dbo.TimeDelay_hh_mm_ss ' , ' P ' ) IS NOT NULL
DROP PROCEDURE dbo.TimeDelay_hh_mm_ss;
GO
CREATE PROCEDURE dbo.TimeDelay_hh_mm_ss
(
@DelayLength char ( 8 ) = ' 00:00:00 '
)
AS
DECLARE @ReturnInfo varchar ( 255 )
IF ISDATE ( ' 2000-01-01 ' + @DelayLength + ' .000 ' ) = 0
BEGIN
SELECT @ReturnInfo = ' Invalid time ' + @DelayLength
+ ' ,hh:mm:ss, submitted. ' ;
-- This PRINT statement is for testing, not use in production.
PRINT @ReturnInfo
RETURN ( 1 )
END
BEGIN
WAITFOR DELAY @DelayLength
SELECT @ReturnInfo = ' A total time of ' + @DelayLength + ' ,
hh:mm:ss, has elapsed! Your time is up. '
-- This PRINT statement is for testing, not use in production.
PRINT @ReturnInfo ;
END ;
GO
/* This statement executes the dbo.TimeDelay_hh_mm_ss procedure. */
EXEC TimeDelay_hh_mm_ss ' 00:00:10 ' ;
GO
执行结果：
A total time of 00:00:10, in hh:mm:ss, has elapsed.Your time is up.
小结：这是一种轻巧的解决方案。当你没有权限指定job时，可以考虑用WaitFor语句。
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