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给SQL Server传送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
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