SQL 动态排序的部分情况实现

原创: willonboy@sina.com
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
 
 
-- =============================================
-- Author:		<william zhang>
-- Create date: <2010-10-29>
-- Description:	<GET HD app product list and order by @orderBy desc
-- return		uidID
--				,szTitle
--				,szBrief
--				,szDescription
--				,szTypeID
--				,szTermCondition
--				,ntPayingway
--				,ntState
--				,dtDate
--				,szTypeName
--				,szThumbnailImage
--				,ntRepute
--				,ntDisrepute
--				,ntScore
--				,ntDownloadCount field>
-- =============================================
-- Version:	
-- new  1.0.0 	(2010-12-07| william ) 
-- =============================================
-- Deploy Version:
-- develop server: 	1.0.0
-- staging server: 	null
-- live server:		null
-- =============================================
-- Modify: (format:| date | user | description |)
-- =============================================
 
 
ALTER PROCEDURE UP_GetHDProductList
@orderBy nvarchar(50)='dtDate',--可选项==>  时间(默认):'dtDate';  下载次数:'ntDownloadCount';  评分:'ntScore';  好评次数:'ntRepute'
@IsHD BIT =0 ,
@IsUserUpload BIT = 0,
@pageIndex INT=1,
@pageSize INT =10,
@pageCount INT OUT,
@recordCount INT OUT
AS
BEGIN --START PROCEDURE
 
SET NOCOUNT ON 
 
	
DECLARE @Count INT 
SELECT  @Count = (@pageSize * @pageIndex) 
 
SELECT 	@recordCount = COUNT(tb_Products.uidID) 
FROM	tb_products
WHERE	1=1
AND		tb_Products.bHD = @IsHD
AND		tb_Products.ntIsUserUpload = @IsUserUpload
AND		tb_Products.szTypeID NOT LIKE '301%'
 
		
 
SELECT @pageCount = CEILING( @recordCount * 1.0 / @pageSize )
 
--下面是执行分页
IF @pageindex = 1
	BEGIN
		SELECT TOP(@pageSize)  tb_Products.uidID
						,tb_Products.szTitle 
						,tb_Products.szBrief
						,tb_Products.szDescription 
						,tb_Products.szTypeID 
						,tb_Products.szTermCondition 
						,tb_Products.ntPayingway
						,tb_Products.ntState
						,tb_Products.dtDate 
						,tb_ProductType.szName AS szTypeName 
						,dbo.fn_GetThumbnailImage(tb_Products.uidID) AS szThumbnailImage
						,dbo.fn_GetReputeOrDisreputeByProductID(tb_Products.uidID,0) AS ntRepute 
						,dbo.fn_GetReputeOrDisreputeByProductID(tb_Products.uidID,-1) AS ntDisrepute 
						,dbo.fn_GetProductScore(tb_Products.uidID) AS ntScore 
						,dbo.fn_GetProdutDownloadCountByProductIDandDatePeriod(tb_Products.uidID,0) AS ntDownloadCount
		FROM	tb_Products 
		LEFT JOIN tb_ProductType 
		ON tb_Products.szTypeID = tb_ProductType.szID
		WHERE	tb_products.ntState = 2 
		AND		tb_Products.bHD = @IsHD
		AND		tb_Products.ntIsUserUpload = @IsUserUpload
		AND		tb_Products.szTypeID NOT LIKE '301%'
		ORDER BY 
			CASE @orderBy
			WHEN 'dtDate' THEN dtDate
			WHEN 'ntRepute' THEN cast(ltrim(dbo.fn_GetReputeOrDisreputeByProductID(tb_Products.uidID,0)) as int)
			WHEN 'ntScore' THEN cast(ltrim(dbo.fn_GetProductScore(tb_Products.uidID)) as int)
			WHEN 'ntDownloadCount' THEN cast(ltrim(dbo.fn_GetProdutDownloadCountByProductIDandDatePeriod(tb_Products.uidID,0)) as int)
			ELSE NULL
			END DESC
	END
ELSE IF @pageIndex > 1 AND @pageIndex < @pageCount          --willonboy@sina.com
	BEGIN
		SELECT	uidID
				,szTitle
				,szBrief
				,szDescription
				,szTypeID
				,szTermCondition
				,ntPayingway
				,ntState
				,dtDate
				,szTypeName
				,szThumbnailImage
				,ntRepute
				,ntDisrepute
				,ntScore
				,ntDownloadCount
		FROM (	SELECT  TOP(@pageSize) *
				FROM (	SELECT TOP(@Count)  tb_Products.uidID
												,tb_Products.szTitle 
												,tb_Products.szBrief
												,tb_Products.szDescription 
												,tb_Products.szTypeID 
												,tb_Products.szTermCondition 
												,tb_Products.ntPayingway
												,tb_Products.ntState
												,tb_Products.dtDate 
												,tb_ProductType.szName AS szTypeName 
												,dbo.fn_GetThumbnailImage(tb_Products.uidID) AS szThumbnailImage
												,dbo.fn_GetReputeOrDisreputeByProductID(tb_Products.uidID,0) AS ntRepute 
												,dbo.fn_GetReputeOrDisreputeByProductID(tb_Products.uidID,-1) AS ntDisrepute 
												,dbo.fn_GetProductScore(tb_Products.uidID) AS ntScore 
												,dbo.fn_GetProdutDownloadCountByProductIDandDatePeriod(tb_Products.uidID,0) AS ntDownloadCount
							FROM	tb_Products 
							LEFT JOIN tb_ProductType 
							ON tb_Products.szTypeID = tb_ProductType.szID
							WHERE	tb_products.ntState = 2 
							AND		tb_Products.bHD = @IsHD
							AND		tb_Products.ntIsUserUpload = @IsUserUpload
							AND		tb_Products.szTypeID NOT LIKE '301%'
							ORDER BY	CASE @orderBy
										WHEN 'dtDate' THEN dtDate
										WHEN 'ntRepute' THEN cast(ltrim(dbo.fn_GetReputeOrDisreputeByProductID(tb_Products.uidID,0)) as int)
										WHEN 'ntScore' THEN cast(ltrim(dbo.fn_GetProductScore(tb_Products.uidID)) as int)
										WHEN 'ntDownloadCount' THEN cast(ltrim(dbo.fn_GetProdutDownloadCountByProductIDandDatePeriod(tb_Products.uidID,0)) as int)
										ELSE NULL
										END DESC
					 ) AS T
				ORDER BY	CASE @orderBy
							WHEN 'dtDate' THEN CAST(T.dtDate AS varchar(50)) 
							WHEN 'ntRepute' THEN CAST(T.ntRepute AS varchar(50)) 
							WHEN 'ntScore' THEN CAST(T.ntScore AS varchar(50)) 
							WHEN 'ntDownloadCount' THEN CAST(T.ntDownloadCount AS varchar(50)) 
							ELSE NULL
							END ASC) TT
		ORDER BY	CASE @orderBy
					WHEN 'dtDate' THEN CAST(TT.dtDate AS varchar(50)) 
					WHEN 'ntRepute' THEN CAST(TT.ntRepute AS varchar(50)) 
					WHEN 'ntScore' THEN CAST(TT.ntScore AS varchar(50)) 
					WHEN 'ntDownloadCount' THEN CAST(TT.ntDownloadCount AS varchar(50)) 
					ELSE NULL
					END DESC
	END 
ELSE IF @pageIndex = @pageCount
	BEGIN
		SELECT	uidID
				,szTitle
				,szBrief
				,szDescription
				,szTypeID
				,szTermCondition
				,ntPayingway
				,ntState
				,dtDate
				,szTypeName
				,szThumbnailImage
				,ntRepute
				,ntDisrepute
				,ntScore
				,ntDownloadCount
		FROM (	SELECT TOP(@RecordCount-(@pageCount-1)*@pageSize) tb_Products.uidID
												,tb_Products.szTitle 
												,tb_Products.szBrief
												,tb_Products.szDescription 
												,tb_Products.szTypeID 
												,tb_Products.szTermCondition 
												,tb_Products.ntPayingway
												,tb_Products.ntState
												,tb_Products.dtDate 
												,tb_ProductType.szName AS szTypeName 
												,dbo.fn_GetThumbnailImage(tb_Products.uidID) AS szThumbnailImage
												,dbo.fn_GetReputeOrDisreputeByProductID(tb_Products.uidID,0) AS ntRepute 
												,dbo.fn_GetReputeOrDisreputeByProductID(tb_Products.uidID,-1) AS ntDisrepute 
												,dbo.fn_GetProductScore(tb_Products.uidID) AS ntScore 
												,dbo.fn_GetProdutDownloadCountByProductIDandDatePeriod(tb_Products.uidID,0) AS ntDownloadCount
							FROM	tb_Products 
							LEFT JOIN tb_ProductType 
							ON tb_Products.szTypeID = tb_ProductType.szID
							WHERE	tb_products.ntState = 2 
							AND		tb_Products.bHD = @IsHD
							AND		tb_Products.ntIsUserUpload = @IsUserUpload
							AND		tb_Products.szTypeID NOT LIKE '301%'
							ORDER BY	CASE @orderBy
										WHEN 'dtDate' THEN dtDate
										WHEN 'ntRepute' THEN cast(ltrim(dbo.fn_GetReputeOrDisreputeByProductID(tb_Products.uidID,0)) as int)
										WHEN 'ntScore' THEN cast(ltrim(dbo.fn_GetProductScore(tb_Products.uidID)) as int)
										WHEN 'ntDownloadCount' THEN cast(ltrim(dbo.fn_GetProdutDownloadCountByProductIDandDatePeriod(tb_Products.uidID,0)) as int)
										ELSE NULL
										END ASC
				) AS T
		ORDER BY	CASE @orderBy
					WHEN 'dtDate' THEN CAST(T.dtDate AS varchar(50)) 
					WHEN 'ntRepute' THEN CAST(T.ntRepute AS varchar(50)) 
					WHEN 'ntScore' THEN CAST(T.ntScore AS varchar(50)) 
					WHEN 'ntDownloadCount' THEN  CAST(T.ntDownloadCount AS varchar(50)) 
					ELSE NULL
					END DESC
	END
 
 
END --END PROCEDURE
GO
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
--Test Code
/**
 
 
DECLARE @pageCount int ,@recordCount int 
 
EXEC UP_GetHDProductList  'ntDownloadCount',0,0, 1, 1500, @pageCount out, @recordCount out
select @pageCount  , @recordCount 
 
 
**/ 
--Test Code
 
 
 
 
 
 

注意:
 
NO.1
CASE @orderBy
		WHEN 'dtDate' THEN CAST(T.dtDate AS varchar(50)) 
		WHEN 'ntRepute' THEN CAST(T.ntRepute AS varchar(50)) 
		WHEN 'ntScore' THEN CAST(T.ntScore AS varchar(50)) 
		WHEN 'ntDownloadCount' THEN  CAST(T.ntDownloadCount AS varchar(50)) 
		ELSE NULL
这一部分的when then 语句摆放不是随意的 必须安照 T-SQL 中定义的类型优先级倒序摆放

NO.2  
	CASE @orderBy
		WHEN 'dtDate' THEN dtDate
		WHEN 'ntRepute' THEN cast(ltrim(dbo.fn_GetReputeOrDisreputeByProductID(tb_Products.uidID,0)) as int)
		WHEN 'ntScore' THEN cast(ltrim(dbo.fn_GetProductScore(tb_Products.uidID)) as int)
		WHEN 'ntDownloadCount' THEN cast(ltrim(dbo.fn_GetProdutDownloadCountByProductIDandDatePeriod(tb_Products.uidID,0)) as int)
		ELSE NULL
对于这部分函数列 只能用函数调用方式(因为不支持假名!!)