標籤:des blog ar sp strong 資料 on div 2014
Sqlserver資料庫分頁查詢一直是Sqlserver的短板,閑來無事,想出幾種方法,假設有表ARTICLE,欄位ID、YEAR...(其他省略),資料53210條(客戶真實資料,量不大),分頁查詢每頁30條,查詢第1500頁(即第45001-45030條資料),欄位ID叢集索引,YEAR無索引,Sqlserver版本:2008R2
第一種方案、最簡單、普通的方法:
代碼如下:
SELECT TOP 30 * FROM ARTICLE WHERE ID NOT IN(SELECT TOP 45000 ID FROM ARTICLE ORDER BY YEAR DESC, ID DESC) ORDER BY YEAR DESC,ID DESC
平均查詢100次所需時間:45s
第二種方案:
代碼如下:
SELECT * FROM ( SELECT TOP 30 * FROM (SELECT TOP 45030 * FROM ARTICLE ORDER BY YEAR DESC, ID DESC) f ORDER BY f.YEAR ASC, f.ID DESC) s ORDER BY s.YEAR DESC,s.ID DESC
平均查詢100次所需時間:138S
第三種方案:
代碼如下:
SELECT * FROM ARTICLE w1, ( SELECT TOP 30 ID FROM ( SELECT TOP 50030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC ) w ORDER BY w.YEAR ASC, w.ID ASC) w2 WHERE w1.ID = w2.ID ORDER BY w1.YEAR DESC, w1.ID DESC
平均查詢100次所需時間:21S
第四種方案:
代碼如下:
SELECT * FROM ARTICLE w1 WHERE ID in ( SELECT top 30 ID FROM ( SELECT top 45030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC ) w ORDER BY w.YEAR ASC, w.ID ASC ) ORDER BY w1.YEAR DESC, w1.ID DESC
平均查詢100次所需時間:20S
第五種方案:
代碼如下:
SELECT w2.n, w1.* FROM ARTICLE w1, ( SELECT TOP 50030 row_number() OVER (ORDER BY YEAR DESC, ID DESC) n, ID FROM ARTICLE ) w2 WHERE w1.ID = w2.ID AND w2.n > 50000 ORDER BY w2.n ASC
平均查詢100次所需時間:15S
查詢第1000-1030條記錄
第一種方案:
代碼如下:
SELECT TOP 30 * FROM ARTICLE WHERE ID NOT IN(SELECT TOP 1000 ID FROM ARTICLE ORDER BY YEAR DESC, ID DESC) ORDER BY YEAR DESC,ID DESC
平均查詢100次所需時間:80s
第二種方案:
代碼如下:
SELECT * FROM ( SELECT TOP 30 * FROM (SELECT TOP 1030 * FROM ARTICLE ORDER BY YEAR DESC, ID DESC) f ORDER BY f.YEAR ASC, f.ID DESC) s ORDER BY s.YEAR DESC,s.ID DESC
平均查詢100次所需時間:30S
第三種方案:
代碼如下:
SELECT * FROM ARTICLE w1, ( SELECT TOP 30 ID FROM ( SELECT TOP 1030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC ) w ORDER BY w.YEAR ASC, w.ID ASC) w2 WHERE w1.ID = w2.ID ORDER BY w1.YEAR DESC, w1.ID DESC
平均查詢100次所需時間:12S
第四種方案:
代碼如下:
SELECT * FROM ARTICLE w1 WHERE ID in ( SELECT top 30 ID FROM ( SELECT top 1030 ID, YEAR FROM ARTICLE ORDER BY YEAR DESC, ID DESC ) w ORDER BY w.YEAR ASC, w.ID ASC ) ORDER BY w1.YEAR DESC, w1.ID DESC
平均查詢100次所需時間:13S
第五種方案:
代碼如下:
SELECT w2.n, w1.* FROM ARTICLE w1,( SELECT TOP 1030 row_number() OVER (ORDER BY YEAR DESC, ID DESC) n, ID FROM ARTICLE) w2 WHERE w1.ID = w2.ID AND w2.n > 1000 ORDER BY w2.n ASC
平均查詢100次所需時間:14S
由此可見在查詢頁數靠前時,效率3>4>5>2>1,頁碼靠後時5>4>3>1>2,再根據使用者習慣,一般使用者的檢索只看最前面幾頁,因此選擇3 4 5方案均可,若綜合考慮方案5是最好的選擇,但是要注意SQL2000不支援row_number()函數,由於時間和條件的限制沒有做更深入、範圍更廣的測試,有興趣的可以仔細研究下。
以下是根據第四種方案編寫的一個分頁預存程序:
代碼如下:
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[sys_Page_v2]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)drop procedure [dbo].[sys_Page_v2]GOCREATE PROCEDURE [dbo].[sys_Page_v2]@PCount int output, --總頁數輸出@RCount int output, --總記錄數輸出@sys_Table nvarchar(100), --查詢表名@sys_Key varchar(50), --主鍵@sys_Fields nvarchar(500), --查詢欄位@sys_Where nvarchar(3000), --查詢條件@sys_Order nvarchar(100), --排序欄位@sys_Begin int, --開始位置@sys_PageIndex int, --當前頁數@sys_PageSize int --頁大小ASSET NOCOUNT ONSET ANSI_WARNINGS ONIF @sys_PageSize < 0 OR @sys_PageIndex < 0BEGIN RETURNENDDECLARE @new_where1 NVARCHAR(3000)DECLARE @new_order1 NVARCHAR(100)DECLARE @new_order2 NVARCHAR(100)DECLARE @Sql NVARCHAR(4000)DECLARE @SqlCount NVARCHAR(4000)DECLARE @Top intif(@sys_Begin <=0) set @sys_Begin=0else set @[email protected]_Begin-1IF ISNULL(@sys_Where,'') = '' SET @new_where1 = ' 'ELSE SET @new_where1 = ' WHERE ' + @sys_WhereIF ISNULL(@sys_Order,'') <> '' BEGIN SET @new_order1 = ' ORDER BY ' + Replace(@sys_Order,'desc','') SET @new_order1 = Replace(@new_order1,'asc','desc') SET @new_order2 = ' ORDER BY ' + @sys_OrderENDELSEBEGIN SET @new_order1 = ' ORDER BY ID DESC' SET @new_order2 = ' ORDER BY ID ASC'ENDSET @SqlCount = 'SELECT @RCount=COUNT(1),@PCount=CEILING((COUNT(1)+0.0)/' + CAST(@sys_PageSize AS NVARCHAR)+') FROM ' + @sys_Table + @new_where1EXEC SP_EXECUTESQL @SqlCount,N'@RCount INT OUTPUT,@PCount INT OUTPUT', @RCount OUTPUT,@PCount OUTPUTIF @sys_PageIndex > CEILING((@RCount+0.0)/@sys_PageSize) --如果輸入的當前頁數大於實際總頁數,則把實際總頁數賦值給當前頁數BEGIN SET @sys_PageIndex = CEILING((@RCount+0.0)/@sys_PageSize)ENDset @sql = 'select '+ @sys_fields +' from ' + @sys_Table + ' w1 ' + ' where '+ @sys_Key +' in (' +'select top '+ ltrim(str(@sys_PageSize)) +' ' + @sys_Key + ' from ' +'(' +'select top ' + ltrim(STR(@sys_PageSize * @sys_PageIndex + @sys_Begin)) + ' ' + @sys_Key + ' FROM ' + @sys_Table + @new_where1 + @new_order2 +') w ' + @new_order1 +') ' + @new_order2print(@sql)Exec(@sql)GO
高效的SQLSERVER分頁查詢(推薦)