程序師世界是廣大編程愛好者互助、分享、學習的平台,程序師世界有你更精彩!
首頁
編程語言
C語言|JAVA編程
Python編程
網頁編程
ASP編程|PHP編程
JSP編程
數據庫知識
MYSQL數據庫|SqlServer數據庫
Oracle數據庫|DB2數據庫
 程式師世界 >> 數據庫知識 >> 其他數據庫知識 >> 更多數據庫知識 >> 高效的SQLSERVER分頁查詢

高效的SQLSERVER分頁查詢

編輯:更多數據庫知識

   Sqlserver數據庫分頁查詢一直是Sqlserver的短板,閒來無事,想出幾種方法,假設有表ARTICLE,字段ID、YEAR...(其他省略),數據53210條(客戶真實數據,量不大),分頁查詢每頁30條,查詢第1500頁(即第45001-45030條數據),字段ID聚集索引,YEAR無索引,Sqlserver版本:2008R2

  第一種方案、最簡單、普通的方法:

  復制代碼代碼如下:

  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:

  復制代碼代碼如下:

  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:

  復制代碼代碼如下:

  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:

  復制代碼代碼如下:

  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:

  復制代碼代碼如下:

  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:

  復制代碼代碼如下:

  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:

  復制代碼代碼如下:

  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:

  復制代碼代碼如下:

  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:

  復制代碼代碼如下:

  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:

  復制代碼代碼如下:

  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,再根據用戶習慣,一般用戶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不支持row_number()函數,由於時間和條件的限制沒有做更深入、范圍更廣的測試,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存儲過程:

  復制代碼代碼如下:

  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]

  GO

  CREATE 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), --查詢字段

  @sys_Where nvarchar(3000), --查詢條件

  @sys_Order nvarchar(100), --排序字段

  @sys_Begin int, --開始位置

  @sys_PageIndex int, --當前頁數

  @sys_PageSize int --頁大小

  AS

  SET NOCOUNT ON

  SET ANSI_WARNINGS ON

  IF @sys_PageSize < 0 OR @sys_PageIndex < 0

  BEGIN

  RETURN

  END

  DECLARE @new_where1 NVARCHAR(3000)

  DECLARE @new_order1 NVARCHAR(100)

  DECLARE @new_order2 NVARCHAR(100)

  DECLARE @Sql NVARCHAR(4000)

  DECLARE @SqlCount NVARCHAR(4000)

  DECLARE @Top int

  if(@sys_Begin <=0)

  set @sys_Begin=0

  else

  set @sys_Begin=@sys_Begin-1

  IF ISNULL(@sys_Where,'') = ''

  SET @new_where1 = ' '

  ELSE

  SET @new_where1 = ' WHERE ' + @sys_Where

  IF 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_Order

  END

  ELSE

  BEGIN

  SET @new_order1 = ' ORDER BY ID DESC'

  SET @new_order2 = ' ORDER BY ID ASC'

  END

  SET @SqlCount = 'SELECT @RCount=COUNT(1),@PCount=CEILING((COUNT(1)+0.0)/'

  + CAST(@sys_PageSize AS NVARCHAR)+') FROM ' + @sys_Table + @new_where1

  EXEC SP_EXECUTESQL @SqlCount,N'@RCount INT OUTPUT,@PCount INT OUTPUT',

  @RCount OUTPUT,@PCount OUTPUT

  IF @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)

  END

  set @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_order2

  print(@sql)

  Exec(@sql)

  GO

  1. 上一頁:
  2. 下一頁:
Copyright © 程式師世界 All Rights Reserved