mssqlserver中最大ID冲突解决办法

CREATE TABLE [dbo].[TbGuidTable](
    [TableName] [varchar](50) NOT NULL,
    [KeyName] [varchar](20) NOT NULL,
    [KeyValue] [varchar](100) NOT NULL
) ON [PRIMARY]

GO

if exists (select * from dbo.sysobjects where id = object_id(N'PCreateGuid') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure PCreateGuid
GO
------------------------------------
--用途：增加一条记录  个人信息
--项目名称：
--说明：
--时间：2011-7-4 15:34:12,2011-08-15
------------------------------------
CREATE PROCEDURE PCreateGuid
@tableName varchar(50),
@keyname varchar(100),
@guid varchar(100) out
as
if not exists(select * from TbGuidTable where tablename=@tableName and keyname=@keyname)
insert into TbGuidTable (tablename,keyname,keyvalue) values(@tableName,@keyname,10000)
update TbGuidTable set keyvalue=keyvalue+1 where tablename=@tableName and keyname=@keyname
select  @guid=cast(keyvalue as varchar) from TbGuidTable where tablename=@tableName and keyname=@keyname
Go

---*****---
declare @tableName varchar(50)
declare @keyname varchar(100)
declare @guid varchar(100)
set @tableName='tb1'
set @keyname='def'
execute PCreateGuid @tableName,@keyname,@guid out
print @guid