SQLServer根据不同前缀生成多套流水号

--种子表
--@prefix 前缀
--@seed 种子值
create table RefNoSeed(
    prefix char(4) unique,
    seed int
)
go

--测试表
--@insertTime 插入时间（仅测试用途）
--@RefNo 流水号
create table RefNoTable(
    insertTime datetime unique,
    RefNo varchar(20) unique
)
go

if OBJECT_ID('F_FormattingSerialNumber','FN') is not null
    drop function dbo.F_FormattingSerialNumber
go
--格式化数值，用于把种子数值转换为10个字符长度的字符串，不足位数前面添加0
--@sn 种子值
--returns 10个字符长度字符串
create function dbo.F_FormattingSerialNumber(@sn int)
    returns varchar(10)
begin
    return cast(replicate('0',10-len(cast(@sn as varchar(10)))) + cast(@sn as varchar(10)) as varchar(10))
end
go

if OBJECT_ID('P_GenerateRefNo','P') is not null
    drop proc dbo.P_GenerateRefNo
go
--获取前缀，生成流水号
--@prefix 前缀
--@timeNow 时间（仅测试用途）
create proc dbo.P_GenerateRefNo
    @prefix varchar(20),
    @timeNow datetime
as
    begin try
        --开启事务
        begin tran
            set nocount on;
            declare @newSeed int
            --根据前缀获取现在的种子值并+1为新种子值
            set @newSeed=(select seed from RefNoSeed where prefix=@prefix)+1
            --若不存在种子值，则按照前缀添加种子值，并把新种子值设置为1
            if @newSeed is null
                begin
                    insert into RefNoSeed values(@prefix,0)
                    set @newSeed=1
                end
            --生成流水号
            declare @sn varchar(20)
            set @sn=@prefix + cast(YEAR(@timeNow) as CHAR(4))+ dbo.F_FormattingSerialNumber(@newSeed)
            --插入数据表中
            insert into RefNoTable (insertTime,RefNo)values(@timeNow,@sn)
            --插入成功后更新种子值
            update RefNoSeed set seed=@newSeed where prefix=@prefix
        --无错则提交事务
        commit
    end try
    begin catch
        --出错则进行回滚
        rollback
    end catch
go

--插入测试数据
declare @timenow datetime
set @timenow=GETDATE()
exec P_GenerateRefNo 'AB',@timenow
waitfor delay '00:00:00.02'
set @timenow=GETDATE()
exec P_GenerateRefNo 'AB',@timenow
waitfor delay '00:00:00.02'
set @timenow=GETDATE()
exec P_GenerateRefNo 'AB',@timenow
waitfor delay '00:00:00.02'
set @timenow=GETDATE()
exec P_GenerateRefNo 'AB',@timenow
waitfor delay '00:00:00.02'
set @timenow=GETDATE()
exec P_GenerateRefNo 'BF',@timenow
waitfor delay '00:00:00.02'
set @timenow=GETDATE()
exec P_GenerateRefNo 'BF',@timenow
waitfor delay '00:00:00.02'
set @timenow=GETDATE()
exec P_GenerateRefNo 'PF',@timenow
waitfor delay '00:00:00.02'
set @timenow=GETDATE()
exec P_GenerateRefNo 'PF',@timenow
waitfor delay '00:00:00.02'
set @timenow=GETDATE()
exec P_GenerateRefNo 'PF',@timenow
waitfor delay '00:00:00.02'
set @timenow=GETDATE()
exec P_GenerateRefNo 'RG',@timenow

--查看数据
select*from RefNoSeed order by prefix
select*from RefNoTable order by REFNO

--清除数据
delete RefNoSeed
delete RefNoTable

drop table RefNoSeed
drop table RefNoTable

if OBJECT_ID('F_FormattingSerialNumber','FN') is not null
    drop function dbo.F_FormattingSerialNumber
go
if OBJECT_ID('P_GenerateRefNo','P') is not null
    drop proc dbo.P_GenerateRefNo
go