解读为SQL Server数据库传数组参数的变通办法

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