日期:2011-05-02 15:20:00 来源:本站整理
给SQL Server传送数组参数的变通办法[MSSQL防范]
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近来一向在做Dnn模块的开辟,历程中碰到这么一个问题,需求同时插入N条数据,不想在程序里掌握,但是SQL Sever又不支持数组参数.所以只能用变通的办法了.操纵sql server强盛的字符串处理传把数组格局化为近似"1,2,3,4,5,6".然后在存储历程顶用SubString配合CharIndex把分割开来.
具体的存储历程
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对此的改良办法:
应当用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
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