怎样同时插入N条数据而不在程序里控制
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