[code=SQL][/code]
USE [Erp]
GO
/****** Object: StoredProcedure [dbo].[PROC_jit_seq_SeqNo] Script Date: 09/20/2012 14:04:40 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROC [dbo].[PROC_jit_seq_SeqNo] @Date datetime
AS
BEGIN
DECLARE @SeqNo VARCHAR(8)
SET @SeqNo=''
SELECT @SeqNo=Seq FROM jit_seq
WHERE dateadd(dd,datediff(dd,0,SeqDate),0) = dateadd(dd,datediff(dd,0,@Date),0)
SET @SeqNo=ISNULL(@SeqNo,'')
IF @SeqNo=''
BEGIN
SET @SeqNo= '0001'
INSERT INTO jit_seq values(dateadd(dd,datediff(dd,0,getdate()),0),@SeqNo)
END
ELSE
BEGIN
SET @SeqNo = RIGHT( '0000' + CAST( @SeqNo + 1 AS VARCHAR(8) ) , 4)
UPDATE jit_seq SET [email protected] WHERE dateadd(dd,datediff(dd,0,SeqDate),0) = dateadd(dd,datediff(dd,0,@Date),0)
END
select @SeqNo as SeqNo
END
我想了解一下 这段存储过程是什么意思? 而且里面每一步都代表什么? 还有dateadd,datediff函数是什么意思?
------解决方案--------------------
dateadd,datediff函数是什么意思?自己学会去查联机丛书
- SQL code
USE [Erp]--切换当前数据库为ERP数据库GO--完整上面操作/****** Object: StoredProcedure [dbo].[PROC_jit_seq_SeqNo] Script Date: 09/20/2012 14:04:40 ******/SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGO--上面4行可以不管ALTER PROC [dbo].[PROC_jit_seq_SeqNo] --存储过程名,create 为创建,因为需要重复执行,所以这里用alter@Date datetime --该存储过程需要一个参数,@date,类型为datetime,必传ASBEGIN DECLARE @SeqNo VARCHAR(8)--定义一个字符串 SET @SeqNo='' --初始化字符串 SELECT @SeqNo=Seq FROM jit_seq --从jit_seq表中,获取 [email protected]?差,seq值,[email protected], WHERE dateadd(dd,datediff(dd,0,SeqDate),0) = dateadd(dd,datediff(dd,0,@Date),0) SET @SeqNo=ISNULL(@SeqNo,'')--如果上一部没有符合的值,则取空字符串给该变量 IF @SeqNo='' --如果变量为空字符串,赋值0001,然后插入jit_seq表 BEGIN SET @SeqNo= '0001' INSERT INTO jit_seq values(dateadd(dd,datediff(dd,0,getdate()),0),@SeqNo) END ELSE --如果变量不是空字符串,则做拼接运算。这部分你可以单独拿出来执行一下看看出来什么结果 BEGIN SET @SeqNo = RIGHT( '0000' + CAST( @SeqNo + 1 AS VARCHAR(8) ) , 4) UPDATE jit_seq SET [email protected] WHERE dateadd(dd,datediff(dd,0,SeqDate),0) = dateadd(dd,datediff(dd,0,@Date),0) END select @SeqNo as SeqNo END