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怎样同时插入N条数据而不在程序里控制

[ 来源:互联网 | 作者:站长胡同站整理 |  时间:2007-11-14 12:10:36 | 浏览:97次 ]

问:“怎样同时插入N条数据,却不在程序里控制?”

答:“由于SQL Sever不支持数组参数.所以只能用另类的办法了.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

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

责编:天羽

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