T-SQL分页排序＆amp;过滤
我现在已经在T-SQL存储过程上工作了几个小时，这使我能够检索一组分页的文章，这些文章是根据指定的列以ASC或DESC顺序排序的。
我现在正致力于根据“标题”字段的第一个字符来过滤存储过程并添加以下行：
@StartAlpha nvarchar(1) = null
和
WHERE ((@StartAlpha IS NULL) OR (Title Like @StartAlpha + '%'))
见下文。
存储过程不再返回任何结果。我真的不知道为什么。
有人可以帮忙吗？
此致
沃尔特
USE [ABC]
GO
/****** Object: StoredProcedure [dbo].[Get_MyArticles_Paged] Script Date: 08/07/2011 20:41:28 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[Get_MyArticles_Paged]
/*Paging Total For Output*/
@Row_Count BIGINT OUT,
/*Paging Inputs*/
@Page_Size INT = 10,
@Page_Number INT = 1,
@Sort_Column VARCHAR(100), /* ('articleid','createdate','title','subject') */
@Sort_Direction VARCHAR(4), /* ('ASC','DESC') */
@StartAlpha nvarchar(1) = null
AS
BEGIN
print @StartAlpha
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
/*========================================================================
Declare local variables
========================================================================*/
DECLARE @FirstRecord int
DECLARE @LastRecord int
-- create a temporary space for paged result set
DECLARE @PagedResults AS TABLE (
[ArticleID] INT,
[CreateDate] SMALLDATETIME,
[Title] VARCHAR(200),
[Subject] VARCHAR(500),
[Row_Number] BIGINT,
[Row_Count] BIGINT
);
/*========================
Normalize Paging Parameters
==========================*/
--Fix invalid input for Page Size
SET @Page_Size = CASE
WHEN @Page_Size IS NULL THEN 10
WHEN @Page_Size < 1 THEN 10
ELSE @Page_Size
END;
--Fix invalid input for Page Number
SET @Page_Number = CASE
WHEN @Page_Number IS NULL THEN 1
WHEN @Page_Number < 1 THEN 1
ELSE @Page_Number
END;
--starting record to use.
SET @FirstRecord = ((@Page_Number - 1) * @Page_Size) + 1
--last record to use.
SET @LastRecord = @FirstRecord + @Page_Size - 1
--ensure sort column is valid in the list
SET @Sort_Column = CASE
WHEN LOWER(@Sort_Column) IN ('articleid','createdate','title','subject')
THEN LOWER(@Sort_Column)
ELSE
'title' --default
END
--ensure sort direction is ASC or DESC
SET @Sort_Direction = CASE
WHEN LEFT(UPPER(COALESCE(@Sort_Direction, '')) + ' ', 4) = 'DESC'
THEN 'DESC' --explicit descending
WHEN @Sort_Column = 'created' AND LEFT(UPPER(COALESCE(@Sort_Direction,'')) + ' ', 3) <> 'ASC' THEN
'DESC' --default for created date
ELSE 'ASC' --default otherwise
END;
/*============
Prepare Results
==============*/
WITH [MyTempArea] AS (
SELECT TOP (@LastRecord)
[ArticleID],
[CreateDate],
[Title],
[Subject],
ROW_NUMBER() OVER (
ORDER BY
CASE WHEN(@Sort_Direction = 'ASC') THEN CASE WHEN @Sort_Column='articleid' THEN [articleid] END END ASC,
CASE WHEN(@Sort_Direction = 'ASC') THEN CASE WHEN @Sort_Column='createdate' THEN [createdate] END END ASC,
CASE WHEN(@Sort_Direction = 'ASC') THEN CASE WHEN @Sort_Column='title' THEN [title] END END ASC,
CASE WHEN(@Sort_Direction = 'ASC') THEN CASE WHEN @Sort_Column='subject' THEN [subject] END END ASC,
CASE WHEN(@Sort_Direction = 'DESC') THEN CASE WHEN @Sort_Column='articleid' THEN [articleid] END END DESC,
CASE WHEN(@Sort_Direction = 'DESC') THEN CASE WHEN @Sort_Column='createdate' THEN [createdate] END END DESC,
CASE WHEN(@Sort_Direction = 'DESC') THEN CASE WHEN @Sort_Column='title' THEN [title] END END DESC,
CASE WHEN(@Sort_Direction = 'DESC') THEN CASE WHEN @Sort_Column='subject' THEN [subject] END END DESC
) AS [Row_Number],
COUNT(*) OVER () AS [Row_Count]
FROM Articles
WHERE ((@StartAlpha IS NULL) OR (Title Like @StartAlpha + '%'))
)
INSERT INTO @PagedResults
SELECT * FROM [MyTempArea] WHERE [Row_Number] >= @FirstRecord;
/*===========
Return Results
=============*/
-- @Row_Count output param
SELECT @Row_Count = COALESCE(MAX(Row_Count), 0) FROM @PagedResults;
-- Paged results set to return
SELECT [ArticleID],[CreateDate],[Title],[Subject]
FROM @PagedResults
ORDER BY [Row_Number];
END
答案 0 :(得分：2)
感谢所有提出有用建议的人。
我完全重构了存储过程，现在可以正常工作了。见下文。
我不完全确定为什么原始的存储过程不起作用以及为什么这个版本会这样做，但我想我会与论坛分享。
再次感谢。
沃尔特。
ALTER PROCEDURE [dbo].[Account_ContactGetData]
@CurrentPage int = null,
@PageSize int = null,
@SortColumn nvarchar(max) = null,
@SortDirection varchar(5),
@StartAlpha nvarchar(1) = null
WITH EXECUTE AS CALLER
AS
BEGIN
SET NOCOUNT ON;
DECLARE @FirstRecord int;
DECLARE @LastRecord int;
--starting record to use.
SET @FirstRecord = ((@CurrentPage - 1) * @PageSize) + 1;
--last record to use.
SET @LastRecord = @FirstRecord + @PageSize - 1;
with ContactCTE as
(
SELECT [ContactID], [DisplayName], [FirstName], [MiddleName], [LastName],
(ROW_NUMBER() OVER (Order By
CASE WHEN @SortColumn='ContactID' AND @SortDirection='DESC' THEN ContactID END DESC,
CASE WHEN @SortColumn='ContactID' AND @SortDirection='ASC' THEN ContactID END ASC,
CASE WHEN @SortColumn='DisplayName' AND @SortDirection='DESC' THEN DisplayName END DESC,
CASE WHEN @SortColumn='DisplayName' AND @SortDirection='ASC' THEN DisplayName END ASC,
CASE WHEN @SortColumn='FirstName' AND @SortDirection='DESC' THEN FirstName END DESC,
CASE WHEN @SortColumn='FirstName' AND @SortDirection='ASC' THEN FirstName END ASC,
CASE WHEN @SortColumn='MiddleName' AND @SortDirection='DESC' THEN MiddleName END DESC,
CASE WHEN @SortColumn='MiddleName' AND @SortDirection='ASC' THEN MiddleName END ASC,
CASE WHEN @SortColumn='LastName' AND @SortDirection='DESC' THEN LastName END DESC,
CASE WHEN @SortColumn='LastName' AND @SortDirection='ASC' THEN LastName END ASC
)) AS Row
FROM Contact
WHERE
((@StartAlpha is NULL) OR (LastName Like @StartAlpha+ '%'))
)
SELECT [ContactID], [DisplayName], [FirstName], [MiddleName], [LastName]
FROM ContactCTE
WHERE Row BETWEEN @FirstRecord AND @LastRecord
END
答案 1 :(得分：1)
仅基于这些要求，我就是这样做的：
WHERE ((@StartAlpha IS NULL) OR (LEFT(Title, 1) = @StartAlpha))
当你只运行这部分时你会得到什么？ （还请说明您在参数中使用的值）
WITH [MyTempArea] AS (
SELECT TOP (@LastRecord)
[ArticleID],
[CreateDate],
[Title],
[Subject],
ROW_NUMBER() OVER (
ORDER BY
CASE WHEN(@Sort_Direction = 'ASC') THEN CASE WHEN @Sort_Column='articleid' THEN [articleid] END END ASC,
CASE WHEN(@Sort_Direction = 'ASC') THEN CASE WHEN @Sort_Column='createdate' THEN [createdate] END END ASC,
CASE WHEN(@Sort_Direction = 'ASC') THEN CASE WHEN @Sort_Column='title' THEN [title] END END ASC,
CASE WHEN(@Sort_Direction = 'ASC') THEN CASE WHEN @Sort_Column='subject' THEN [subject] END END ASC,
CASE WHEN(@Sort_Direction = 'DESC') THEN CASE WHEN @Sort_Column='articleid' THEN [articleid] END END DESC,
CASE WHEN(@Sort_Direction = 'DESC') THEN CASE WHEN @Sort_Column='createdate' THEN [createdate] END END DESC,
CASE WHEN(@Sort_Direction = 'DESC') THEN CASE WHEN @Sort_Column='title' THEN [title] END END DESC,
CASE WHEN(@Sort_Direction = 'DESC') THEN CASE WHEN @Sort_Column='subject' THEN [subject] END END DESC
) AS [Row_Number],
COUNT(*) OVER () AS [Row_Count]
FROM Articles
WHERE ((@StartAlpha IS NULL) OR (Title Like @StartAlpha + '%'))
)
SELECT * FROM [MyTempArea]
答案 2 :(得分：0)
@Andreas LEFT(Title, 1)语法比同类比较表现得更好...但是使用类似的，这应该有效：
WHERE (Title Like isnull(@StartAlpha, '') + '%')
（使用OR使我变得前卫的空值的组合。）