【Vegas原创】SQL Server游标的经典使用

USE [PACSMonitor]

GO

/****** Object:  StoredProcedure [dbo].[sp_GetPSExamCountByDay]    Script Date: 04/22/2010 14:35:14 ******/

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

ALTER PROCEDURE [dbo].[sp_GetPSExamCountByDay]

AS

DECLARE @date nvarchar(50)

--先干其他的事情

insert into dbo.rpt_psExamCountByDay(rptDate)

select distinct substring((ex_cdt),1,8) from v_psExam 

where substring((ex_cdt),1,8) COLLATE SQL_Latin1_General_CP1_CI_AS not in(select distinct rptdate from rpt_psExamCountByDay)

--声明游标变量，取得数据--

DECLARE contact_cursor CURSOR FOR

SELECT rptDate FROM rpt_psExamCountByDay  

--打开游标

OPEN contact_cursor 

FETCH NEXT FROM contact_cursor into @date  --开始抓第一条数据

WHILE(@@fetch_status=0) 

    BEGIN     

        update rpt_psExamCountByDay

        set rptCount=(

            select COUNT(1) from v_psExam 

            where substring((ex_cdt),1,8) collate SQL_Latin1_General_CP1_CI_AS=@date)

            where rptDate=@date

        FETCH NEXT FROM contact_cursor into @date     --跳到下一条数据    

    END

--关闭游标

CLOSE contact_cursor

--删除游标

DEALLOCATE contact_cursor