存储过程生成流水号----灵活版

SQL SERVER 2000 存储过程生成编号-流水号 2008-06-24 21:32表：
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[NumSeq]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[NumSeq]
GO

CREATE TABLE [dbo].[NumSeq] (
[Prefix] [varchar] (6) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[Seq] [int] NOT NULL ,
[LastDate] [datetime] NOT NULL
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[NumSeq] WITH NOCHECK ADD
CONSTRAINT [PK_NumSeq] PRIMARY KEY CLUSTERED
(
[Prefix]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[NumSeq] ADD
CONSTRAINT [DF_NumSeq_Prefix] DEFAULT (0) FOR [Prefix],
CONSTRAINT [DF_NumSeq_Seq] DEFAULT (0) FOR [Seq],
CONSTRAINT [DF_NumSeq_LastDate] DEFAULT (getdate()) FOR [LastDate]
GO
存储过程：
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[GetSeqNum]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[GetSeqNum]
GO

SET QUOTED_IDENTIFIER ON
GO
SET ANSI_NULLS ON
GO

CREATE PROCEDURE GetSeqNum
@Prefix VARCHAR(6)
AS
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
BEGIN TRANSACTION
DECLARE
@Seq INT,
@LastDate DATETIME,
@Now DATETIME,
@MaintainNo VARCHAR(20)

----INIT
SELECT @Now=GETDATE()

----INSERT
IF NOT EXISTS(SELECT * FROM NumSeq WHERE Prefix=@Prefix)
BEGIN
INSERT INTO NumSeq(Prefix,Seq,LastDate) VALUES(UPPER(@Prefix),0,@Now)
END

--GET LastDate
SELECT @LastDate=LastDate FROM NumSeq WHERE Prefix=@Prefix

----IF LastDate > Now
IF(@LastDate > @Now)
BEGIN
RAISERROR ('LastDate < Now ,Please check system time.' , 16, 1) WITH NOWAIT
ROLLBACK TRANSACTION
RETURN 0
END ELSE BEGIN
----UPDATE
IF (DATEDIFF(DAY,@LastDate,@Now)<>0)
BEGIN
UPDATE NumSeq SET LastDate=@NOW,Seq=1 WHERE Prefix=@Prefix
END ELSE BEGIN
UPDATE NumSeq SET Seq=Seq + 1 WHERE Prefix=@Prefix
END

----Get Seq Num
SELECT @Seq=Seq FROM NumSeq WHERE Prefix=@Prefix
SELECT @MaintainNo=UPPER(@Prefix) + CONVERT(VARCHAR(12), @Now,112) + RIGHT('000000' + CONVERT(VARCHAR(6),@Seq),6)

----Return
SELECT @MaintainNo
END
COMMIT TRANSACTION

GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO

执行 exec getseqnum 'aaa'，输出 AAA20080624000003