DB生成唯一Code

思路:创建标量,得到Code字段最大值转为int再加1

 

 

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

--不同表  1:Products 2:InsideList 3:Sale 4:SaleBack 5:Payment 6:Gathering 7:CheckStock

ALTER FUNCTION [dbo].[GetCode]
(
 @TableNameFlag varchar(2)
)
RETURNS varchar(max)
AS
BEGIN
 DECLARE @Code varchar(max)
 DECLARE @num int
 set @Code='00000001'
 if @TableNameFlag='1'
  set @num=(select max(Convert(int,ProCode))+1 as Code from Products)
 if @TableNameFlag='2'
  set @num=(select max(Convert(int,InsideCode))+1  as Code from InsideList )
 if @TableNameFlag='3'
  set @num=(select max(Convert(int,SaleNO))+1  as Code from Sale )
 if @TableNameFlag='4'
  set @num=(select max(Convert(int,SaleBackNO))+1  as Code from SaleBack )
 if @TableNameFlag='5'
  set @num=(select max(Convert(int,Code))+1  as Code from Payment )
 if @TableNameFlag='6'
  set @num=(select max(Convert(int,Code))+1  as Code from Gathering )
 if @TableNameFlag='7'
  set @num=(select max(Convert(int,Code))+1  as Code from CheckStock )
 if @num<10
  set @Code='0000000'+CAST(@num as varchar(max))
 else if @num<100
  set @Code='000000'+CAST(@num as varchar(max))
 else if @num<1000
  set @Code='00000'+CAST(@num as varchar(max))
 else if @num<10000
  set @Code='0000'+CAST(@num as varchar(max))
 else if @num<100000
  set @Code='000'+CAST(@num as varchar(max))
 else if @num<1000000
  set @Code='00'+CAST(@num as varchar(max))
 else if @num<10000000
  set @Code='0'+CAST(@num as varchar(max))
 else if @num<100000000
  set @Code=CAST(@num as varchar(max))
 
 RETURN @Code

END