我正在尝试开发基于“文章”的系统，数据库中可以有一个文章条目，然后链接到该ArticleData的文章数据很多。
现在我正在尝试正确更新PageOrder。我希望数字始终保持一致，例如1到15。我不希望页码像这样。 1,1,3,6,8,9,10 ......它应该只是1,2,3,4,5,6,7。
我在为文章添加新记录时设法完成，因为我插入新记录然后成功重新计算排序。问题是当我想改变官方记录时。例如：
假设我有5页。
- 第1页，
- 第2页，
- 第3页，
- 第4页，
- 第5页
让我们说我希望成为第三页
- 第1页，
- 第2页，
- 第4页，
- 第5页，
- 第3页
现在索引我希望能够重新编制索引，使其变得像它应该的那样。
现在的问题是......如何在T-SQL过程中执行此操作（SQL Server 2005）？
ALTER PROCEDURE [dbo].[Admin_InsertOrUpdateArticle]
@Id int = null
,@ArticleId int = null
,@Header varchar(50)
,@ParentId int = null
,@ArticleType int
,@DisplayOrder int = 0
,@Content text
,@ModifiedById int
,@ModifiedBy varchar(50)
,@ModifiedDate datetime
,@Subject varchar(100)
,@NewPage int
AS
BEGIN
SET NOCOUNT ON;
UPDATE
[Article]
SET
[Header] = @Header
,[ParentId] = @ParentId
,[DisplayOrder] = @DisplayOrder
,[Type] = @ArticleType
WHERE
[Article].[Id] = @ArticleId
-- If Article does not exists then we don't have any record of even Article Data!
-- NEW RECORD!
IF(@@ROWCOUNT = 0)
BEGIN
INSERT INTO [Article]
(
[Header]
,[ParentId]
,[DisplayOrder]
,[Type]
)
VALUES
(
@Header
,@ParentId
,@DisplayOrder
,@ArticleType
);
INSERT INTO [ArticleData]
(
[ArticleId]
,[Content]
,[CreatedBy]
,[CreatedById]
,[ModifiedBy]
,[ModifiedById]
,[PostDate]
,[ModifiedDate]
,[Subject]
,[PageOrder]
)
VALUES
(
@@IDENTITY
,@Content
,@ModifiedBy
,@ModifiedById
,@ModifiedBy
,@ModifiedById
,@ModifiedDate
,@ModifiedDate
,@Subject
,1 -- First Page!!!
)
END
ELSE
BEGIN
-- We do have a Article Record, therefore we update the current page and check to see if it is a new page!
UPDATE
[ArticleData]
SET
[Content] = @Content
,[Subject] = @Subject
,[ModifiedBy] = @ModifiedBy
,[ModifiedById] = @ModifiedById
,[ModifiedDate] = @ModifiedDate
WHERE
[ArticleData].[Id] = @Id AND
[ArticleData].[ArticleId] = @ArticleId
-- Are we a new Article Data?
IF( @@ROWCOUNT = 0 )
BEGIN
-- We are lets check to see if the page we want this article for exists
IF EXISTS ( SELECT [PageOrder] FROM [ArticleData] WHERE [ArticleId] = @ArticleId AND [PageOrder] = @NewPage )
BEGIN
-- It does exists therefore we need to reorder the pages
UPDATE
[ArticleData]
SET
[PageOrder] = A.PageOrder + 1
FROM [ArticleData] A
WHERE
A.PageOrder >= @NewPage AND
[ArticleId] = @ArticleId
-- We now Insert The New data that we want at that page
INSERT INTO [ArticleData]
(
[ArticleId]
,[Content]
,[CreatedBy]
,[CreatedById]
,[ModifiedBy]
,[ModifiedById]
,[PostDate]
,[ModifiedDate]
,[Subject]
,[PageOrder]
)
VALUES
(
@ArticleId
,@Content
,@ModifiedBy
,@ModifiedById
,@ModifiedBy
,@ModifiedById
,@ModifiedDate
,@ModifiedDate
,@Subject
,@NewPage
)
END
ELSE
BEGIN
-- Since that page we want to add is not in reach we will simply add it to the very last page
INSERT INTO [ArticleData]
(
[ArticleId]
,[Content]
,[CreatedBy]
,[CreatedById]
,[ModifiedBy]
,[ModifiedById]
,[PostDate]
,[ModifiedDate]
,[Subject]
,[PageOrder]
)
VALUES
(
@ArticleId
,@Content
,@ModifiedBy
,@ModifiedById
,@ModifiedBy
,@ModifiedById
,@ModifiedDate
,@ModifiedDate
,@Subject
,(SELECT COUNT(Id)+1 FROM [ArticleData] WHERE [ArticleId] = @ArticleId) -- Add new Page as Last Record
)
END
END
ELSE
BEGIN
-- The article did update therefore lets reorder our pages based on the new page defined
-- Does this page in the article exists? IF it does lets update the pages
IF EXISTS ( SELECT [PageOrder] FROM [ArticleData] WHERE [ArticleId] = @ArticleId AND [PageOrder] = @NewPage )
BEGIN
-- Update all pages with new numbers
UPDATE
[ArticleData]
SET
[PageOrder] = A.PageOrder + 1
FROM [ArticleData] A
WHERE
A.PageOrder >= @NewPage AND
[ArticleId] = @ArticleId
-- Update THIS article data with the new page number
UPDATE
[ArticleData]
SET
[PageOrder] = @NewPage
WHERE
[ArticleData].[Id] = @Id AND
[ArticleData].[ArticleId] = @ArticleId
END
ELSE
BEGIN
-- Page doesn't exists because what we want to change it to is to far out of range for example if there are only 5 pages, then the ordering will simply set this page to the last index
UPDATE
[ArticleData]
SET
[PageOrder] = (SELECT COUNT(Id) FROM [ArticleData] WHERE [Id] = @Id AND [ArticleId] = @ArticleId)
WHERE
[ArticleData].[Id] = @Id AND
[ArticleData].[ArticleId] = @ArticleId
END
END
END
END
答案 0 :(得分：3)
重新编号页面相对简单，但我无法判断您是否要将其插入现有代码中，在这种情况下，不确定这会发生什么：
DECLARE @OldPageID int
DECLARE @NewPageID int
set @OldPageID = 3
set @NewPageID = 5
UPDATE
Page
SET
PageID = CASE
WHEN PageID = @OldPageID THEN @NewPageID ELSE
WHEN @OldPageID < @NewPageID THEN PageID -1 ELSE PageID + 1 END
where
PageID between
CASE WHEN @OldPageID < @NewPageID THEN @OldPageID ELSE @NewPageID END
and
CASE WHEN @OldPageID < @NewPageID THEN @NewPageID ELSE @OldPageID END
答案 1 :(得分：0)
这是我的最终结果
ALTER PROCEDURE [dbo].[Admin_InsertOrUpdateArticle]
@Id int = null
,@ArticleId int = null
,@Header varchar(50)
,@ParentId int = null
,@ArticleType int
,@DisplayOrder int = 0
,@Content text
,@ModifiedById int
,@ModifiedBy varchar(50)
,@ModifiedDate datetime
,@Subject varchar(100)
,@NewPage int
AS
BEGIN
SET NOCOUNT ON;
UPDATE
[Article]
SET
[Header] = @Header
,[ParentId] = @ParentId
,[DisplayOrder] = @DisplayOrder
,[Type] = @ArticleType
WHERE
[Article].[Id] = @ArticleId
-- If Article does not exists then we don't have any record of even Article Data!
-- NEW RECORD!
IF(@@ROWCOUNT = 0)
BEGIN
INSERT INTO [Article]
(
[Header]
,[ParentId]
,[DisplayOrder]
,[Type]
)
VALUES
(
@Header
,@ParentId
,@DisplayOrder
,@ArticleType
);
INSERT INTO [ArticleData]
(
[ArticleId]
,[Content]
,[CreatedBy]
,[CreatedById]
,[ModifiedBy]
,[ModifiedById]
,[PostDate]
,[ModifiedDate]
,[Subject]
,[PageOrder]
)
VALUES
(
@@IDENTITY
,@Content
,@ModifiedBy
,@ModifiedById
,@ModifiedBy
,@ModifiedById
,@ModifiedDate
,@ModifiedDate
,@Subject
,1 -- First Page!!!
)
END
ELSE
BEGIN
-- We do have a Article Record, therefore we update the current page and check to see if it is a new page!
UPDATE
[ArticleData]
SET
[Content] = @Content
,[Subject] = @Subject
,[ModifiedBy] = @ModifiedBy
,[ModifiedById] = @ModifiedById
,[ModifiedDate] = @ModifiedDate
WHERE
[ArticleData].[Id] = @Id AND
[ArticleData].[ArticleId] = @ArticleId
-- Are we a new Article Data?
IF( @@ROWCOUNT = 0 )
BEGIN
-- We are lets check to see if the page we want this article for exists
IF EXISTS ( SELECT [PageOrder] FROM [ArticleData] WHERE [ArticleId] = @ArticleId AND [PageOrder] = @NewPage )
BEGIN
-- It does exists therefore we need to reorder the pages
UPDATE
[ArticleData]
SET
[PageOrder] = A.PageOrder + 1
FROM [ArticleData] A
WHERE
A.PageOrder >= @NewPage AND
[ArticleId] = @ArticleId
-- We now Insert The New data that we want at that page
INSERT INTO [ArticleData]
(
[ArticleId]
,[Content]
,[CreatedBy]
,[CreatedById]
,[ModifiedBy]
,[ModifiedById]
,[PostDate]
,[ModifiedDate]
,[Subject]
,[PageOrder]
)
VALUES
(
@ArticleId
,@Content
,@ModifiedBy
,@ModifiedById
,@ModifiedBy
,@ModifiedById
,@ModifiedDate
,@ModifiedDate
,@Subject
,@NewPage
)
END
ELSE
BEGIN
-- Since that page we want to add is not in reach we will simply add it to the very last page
INSERT INTO [ArticleData]
(
[ArticleId]
,[Content]
,[CreatedBy]
,[CreatedById]
,[ModifiedBy]
,[ModifiedById]
,[PostDate]
,[ModifiedDate]
,[Subject]
,[PageOrder]
)
VALUES
(
@ArticleId
,@Content
,@ModifiedBy
,@ModifiedById
,@ModifiedBy
,@ModifiedById
,@ModifiedDate
,@ModifiedDate
,@Subject
,(SELECT COUNT(Id)+1 FROM [ArticleData] WHERE [ArticleId] = @ArticleId) -- Add new Page as Last Record
)
END
END
ELSE
BEGIN
-- The article did update therefore lets reorder our pages based on the new page defined
DECLARE @OldPage int
SET @OldPage = (SELECT [PageOrder] FROM [ArticleData] WHERE [ArticleId] = @ArticleId AND [Id] = @Id) -- Get the old Page from the Id we have
IF ( @OldPage != @NewPage )
BEGIN
UPDATE
[ArticleData]
SET
PageOrder = CASE
WHEN PageOrder = @OldPage THEN @NewPage
WHEN @OldPage < @NewPage THEN PageOrder -1 ELSE PageOrder + 1 END
WHERE
PageOrder BETWEEN
CASE WHEN @OldPage < @NewPage THEN @OldPage ELSE @NewPage END
AND
CASE WHEN @OldPage < @NewPage THEN @NewPage ELSE @OldPage END
END
END
END
END