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('',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