SQL Server存储过程 对数组参数的循环处理
方法一 分割例:通过SQL Server存储过程传送数组参数删除多条记录
eg. ID 值为'1,2,3' 以下存储过程就是删除表中id号为1,2,3的记录：
CREATE PROCEDURE DeleteNews
@ID nvarchar(500)
as
DECLARE @PointerPrev int
DECLARE @PointerCurr int
DECLARE @TId int
Set @PointerPrev=1
while (@PointerPrev < LEN(@ID))
Begin
Set @PointerCurr=CharIndex(',',@ID,@PointerPrev)
if(@PointerCurr>0)
Begin
set @TId=cast(SUBSTRING(@ID,@PointerPrev,@PointerCurr-@PointerPrev) as int)
Delete from News where ID=@TID
SET @PointerPrev = @PointerCurr+1
End
else
Break
End
--删除最后一个,因为最后一个后面没有逗号,所以在循环中跳出,需另外再删除
set @TId=cast(SUBSTRING(@ID,@PointerPrev,LEN(@ID)-@PointerPrev+1) as int)
Delete from News where ID=@TID
GO
方法二 Table对象
传3个参数，都是数组形式还有时间类型用存储过程更新
@Oid = 1,2,3,4
@Did = 111,222,333,444
@DateArr = '2007-1-1,2007-1-2,2007-1-3,2007-1-4'
CREATE proc Test999
@Oid nvarchar(1000) --ID1
,@Did nvarchar(1000) --ID2
,@DateArr nvarchar(1000) --日期
AS
DECLARE @id1s varchar(8000), @id2s varchar(8000), @dates varchar(8000)
set @id1s=@Oid
set @id2s=@Did
set @dates = @DateArr
-- 调用函数实现处理
SELECT @id1s=@id1s, @id2s=@id2s,@dates = @dates
UPDATE A SET terminate_time = B.dt
FROM A,(
SELECT
id1 = CONVERT(int, Desk_id.value),
id2 = CONVERT(int, room_id.value),
dt = CONVERT(datetime, terminate_time.value)
FROM dbo.f_splitstr(@id1s) Desk_id, dbo.f_splitstr(@id2s) room_id, dbo.f_splitstr(@dates) terminate_time
WHERE Desk_id.id = room_id.id
AND Desk_id.id = terminate_time.id
) B
WHERE A.Desk_id = B.ID1 AND A.room_id = B.ID2
GO这个还用到一个函数f_splitstr
CREATE FUNCTION dbo.f_splitstr(
@str varchar(8000)
)RETURNS @r TABLE(id int IDENTITY(1, 1), value varchar(5000))
AS
BEGIN
DECLARE @pos int
SET @pos = CHARINDEX(',', @str)
WHILE @pos > 0
BEGIN
INSERT @r(value) VALUES(LEFT(@str, @pos - 1))
SELECT
@str = STUFF(@str, 1, @pos, ''),
@pos = CHARINDEX(',', @str)
END
IF @str > ''
INSERT @r(value) VALUES(@str)
RETURN
END
方法三 xml
应该用SQL2000 OpenXML更简单，效率更高，代码更可读：
CREATE Procedure .
(
@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.
FROM
OPENXML(@idoc, '/Products/Product', 3)
with (ProductId int ) as C
where
C. is not null
EXEC sp_xml_removedocument @idoc
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