看MSDN:@H_502_1@http://msdn.microsoft.com/zh-cn/library/ms187331.aspx
语法为：
WAITFOR @H_502_1@{@H_502_1@ DELAY 'time_to_pass' @H_502_1@ | TIME 'time_to_execute' @H_502_1@ | [ ( receive_statement ) | ( get_conversation_group_statement ) ] @H_502_1@ [,TIMEOUT timeout ]@H_502_1@}@H_502_1@
以下示例在晚上 10:20 (22:20) 执行存储过程 sp_update_job。@H_502_1@
代码如下:
502_1@USE msdb; @H_502_1@EXECUTE sp_add_job @job_name = 'TestJob'; @H_502_1@BEGIN @H_502_1@WAITFOR TIME '22:20'; @H_502_1@EXECUTE sp_update_job @job_name = 'TestJob',@H_502_1@@new_name = 'UpdatedJob'; @H_502_1@END; @H_502_1@GO @H_502_1@
@H_502_1@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 @H_502_1@ 代码如下:
502_1@BEGIN @H_502_1@WAITFOR DELAY '02:00'; @H_502_1@EXECUTE sp_helpdb; @H_502_1@END; @H_502_1@GO @H_502_1@
@H_502_1@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。 @H_502_1@ 代码如下:
502_1@USE AdventureWorks2008R2; @H_502_1@GO @H_502_1@IF OBJECT_ID('dbo.TimeDelay_hh_mm_ss','P') IS NOT NULL @H_502_1@DROP PROCEDURE dbo.TimeDelay_hh_mm_ss; @H_502_1@GO @H_502_1@CREATE PROCEDURE dbo.TimeDelay_hh_mm_ss @H_502_1@( @H_502_1@@DelayLength char(8)= '00:00:00' @H_502_1@) @H_502_1@AS @H_502_1@DECLARE @ReturnInfo varchar(255) @H_502_1@IF ISDATE('2000-01-01 ' + @DelayLength + '.000') = 0 @H_502_1@BEGIN @H_502_1@SELECT @ReturnInfo = 'Invalid time ' + @DelayLength @H_502_1@+ ',hh:mm:ss,submitted.'; @H_502_1@-- This PRINT statement is for testing,not use in production. @H_502_1@PRINT @ReturnInfo @H_502_1@RETURN(1) @H_502_1@END @H_502_1@BEGIN @H_502_1@WAITFOR DELAY @DelayLength @H_502_1@SELECT @ReturnInfo = 'A total time of ' + @DelayLength + ',@H_502_1@hh:mm:ss,has elapsed! Your time is up.' @H_502_1@-- This PRINT statement is for testing,not use in production. @H_502_1@PRINT @ReturnInfo; @H_502_1@END; @H_502_1@GO @H_502_1@/* This statement executes the dbo.TimeDelay_hh_mm_ss procedure. */ @H_502_1@EXEC TimeDelay_hh_mm_ss '00:00:10'; @H_502_1@GO @H_502_1@
@H_502_1@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。 @H_502_1@邀月注：本文版权由邀月和博客园共同所有，转载请注明出处。