if exists(select 1 from sysobjects where id=OBJECT_ID(‘GetSerialNo‘) and xtype=‘p‘)
drop proc GetSerialNo
go
Create procedure [dbo].[GetSerialNo]
(
@sCode varchar(50)
)
as
begin
Declare @sValue varchar(16),@dToday datetime,@sQZ varchar(50) --这个代表前缀
Begin Tran
Begin Try
-- 锁定该条记录，好多人用lock去锁，起始这里只要执行一句update就可以了
--在同一个事物中，执行了update语句之后就会启动锁
Update SerialNo set sValue=sValue where sCode=@sCode
Select @sValue = sValue From SerialNo where sCode=@sCode
Select @sQZ = sQZ From SerialNo where sCode=@sCode
-- 因子表中没有记录，插入初始值
If @sValue is null
Begin
Select @sValue = convert(bigint, convert(varchar(6), getdate(), 12) + ‘000001‘)
Update SerialNo set sValue=@sValue where sCode=@sCode
end else
Begin --因子表中没有记录
Select @dToday = substring(@sValue,1,6)
--如果日期相等，则加1
If @dToday = convert(varchar(6), getdate(), 12)
Select @sValue = convert(varchar(16), (convert(bigint, @sValue) + 1))
else --如果日期不相等，则先赋值日期，流水号从1开始
Select @sValue = convert(bigint, convert(varchar(6), getdate(), 12) +‘000001‘)
Update SerialNo set sValue =@sValue where sCode=@sCode
End
Select result = @sQZ+@sValue
Commit Tran
End Try
Begin Catch
Rollback Tran
Select result = ‘Error‘
End Catch
end
select*from SerialNo
select convert(varchar(6), getdate(), 12)+‘000001‘
