Sql Server 2008 中 goto 用法在wms中实例

GOTO 可以实现循环或者递归，语法如下：

declare @a int=0
lable:
	if @a>2
		return
	else
		begin 
			select @a
			set @a=@a+1
			goto lable
		end

运行结果如下：

现有需求：通过wms对应sku的批次，找到最初入库的原始入库单号（考虑库内做过转移，批次多次改变情况）

可以使用 GOTO 实现递归查询，用法如下：

USE [wmsa]
GO
/****** Object:  UserDefinedFunction [dbo].[fn_getAsnReference1]    Script Date: 11/21/2018 17:38:08 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER function [dbo].[fn_getAsnReference1] (@lotnum varchar(50))
returns  varchar(50)

as
begin
	declare @DocNo varchar(50)= '',@result  varchar(50)= ''
	
	lable1:
	select  @DocNo = MAX(DocNo) from ACT_Transaction_Log 
	where ToLotnum = @lotnum and TransactionType = 'IN' and Status = '99' 
	
	if(ISNULL(@DocNo,'') <> '')
		begin
			select @result = case ASNReference1 when '' then ASNNo when null then ASNNo else ASNReference1 end
			from DOC_ASN_Header 
			where ASNNo = @DocNo
		end
	else
		begin
		  select @lotnum = FMLotNum from ACT_Transaction_Log 
		  where ToLotnum = @lotnum and TransactionType = 'TR' and Status = '99'
		  and ToLotnum<>FMLotNum 
		 
		  goto lable1
		end
	

return @result
end