给SQL Server传送数组参数的变通办法

人气：　来源：网络　作者：佚名　所属栏目：MYSQL　[切换到繁體中文]

最近一直在做Dnn模块的开发,过程中碰到这么一个问题,需要同时插入N条数据,不想在程序里控制,但是SQL Sever又不支持数组参数.所以只能用变通的办法了.利用SQL Server强大的字符串处理传把数组格式化为类似"1,2,3,4,5,6"。然后在存储过程中用SubString配合CharIndex把分割开来.

详细的存储过程

CREATE PROCEDURE dbo.ProductListUpdateSpecialList 
@ProductId_Array varChar(800), 
@ModuleId int 
AS 
DECLARE @PointerPrev int 
DECLARE @PointerCurr int 
DECLARE @TId int 
Set @PointerPrev=1 
set @PointerCurr=1 

begin transaction 
Set NoCount ON 
delete from ProductListSpecial where ModuleId=@ModuleId 

Set @PointerCurr=CharIndex(',',@ProductId_Array,@PointerPrev+1) 
set @TId=cast(SUBSTRING(@ProductId_Array,@PointerPrev,@PointerCurr-@PointerPrev) as int) 
Insert into ProductListSpecial (ModuleId,ProductId) Values(@ModuleId,@TId) 
SET @PointerPrev = @PointerCurr 
while (@PointerPrev+1 < LEN(@ProductId_Array)) 
Begin 
Set @PointerCurr=CharIndex(',',@ProductId_Array,@PointerPrev+1) 
if(@PointerCurr> 0) 
Begin 
set @TId=cast(SUBSTRING(@ProductId_Array,@PointerPrev+1,@PointerCurr-@PointerPrev-1) as int) 
Insert into ProductListSpecial (ModuleId,ProductId) Values(@ModuleId,@TId) 
SET @PointerPrev = @PointerCurr 
End 
else 
Break 
End 

set @TId=cast(SUBSTRING(@ProductId_Array,@PointerPrev+1,LEN(@ProductId_Array)-@PointerPrev) as int) 
Insert into ProductListSpecial (ModuleId,ProductId) Values(@ModuleId,@TId) 
Set NoCount OFF 
if error=0 
begin 
commit transaction 
end 
else 
begin 
rollback transaction 
end 
GO

网友Bizlogic对此的改进方法:

应该用SQL2000 OpenXML更简单，效率更高，代码更可读：

CREATE Procedure [dbo].[ProductListUpdateSpecialList] 
( 
@ProductId_Array NVARCHAR(2000), 
@ModuleId INT 
) 

AS 

delete from ProductListSpecial where ModuleId=@ModuleId 

-- If empty, return 
IF (@ProductId_Array IS NULL OR LEN(LTRIM(RTRIM(@ProductId_Array))) = 0) 
RETURN 

DECLARE @idoc int 

EXEC sp_xml_preparedocument @idoc OUTPUT, @ProductId_Array 

Insert into ProductListSpecial (ModuleId,ProductId) 
Select 
@ModuleId,C.[ProductId] 
FROM 
OPENXML(@idoc, '/Products/Product', 3) 
with (ProductId int ) as C 
where 
C.[ProductId] is not null 

EXEC sp_xml_removedocument @idoc