高效的SQLSERVER分页查询

网络整理 - 08-18

   Sqlserver数据库分页查询一直是Sqlserver的短板,闲来无事,想出几种方法,假设有表ARTICLE,字段ID、YEAR...(其他省略),数据53210条(客户真实数据,量不大),分页查询每页30条,查询第1500页(即第45001-45030条数据),字段ID聚集索引,YEAR无索引,Sqlserver版本:2008R2

  第一种方案、最简单、普通的方法:

  复制代码代码如下:

  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

  平均查询100次所需时间:45s

  第二种方案:

  复制代码代码如下:

  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

  平均查询100次所需时间:138S

  第三种方案:

  复制代码代码如下:

  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

  平均查询100次所需时间:21S

  第四种方案:

  复制代码代码如下:

  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

  平均查询100次所需时间:20S

  第五种方案:

  复制代码代码如下:

  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

  平均查询100次所需时间:15S

  查询第1000-1030条记录

  第一种方案:

  复制代码代码如下:

  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

  平均查询100次所需时间:80s

  第二种方案:

  复制代码代码如下:

  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

  平均查询100次所需时间:30S

  第三种方案:

  复制代码代码如下:

  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

  平均查询100次所需时间:12S

  第四种方案:

  复制代码代码如下:

  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

  平均查询100次所需时间:13S

  第五种方案:

  复制代码代码如下:

  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

  平均查询100次所需时间:14S

  由此可见在查询页数靠前时,效率3>4>5>2>1,页码靠后时5>4>3>1>2,再根据用户习惯,一般用户的检索只看最前面几页,因此选择3 4 5方案均可,若综合考虑方案5是最好的选择,但是要注意SQL2000不支持row_number()函数,由于时间和条件的限制没有做更深入、范围更广的测试,有兴趣的可以仔细研究下。

  以下是根据第四种方案编写的一个分页存储过程:

  复制代码代码如下:

  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, --总页数输出

  @RCount int output, --总记录数输出

  @sys_Table nvarchar(100), --查询表名

  @sys_Key varchar(50), --主键

  @sys_Fields nvarchar(500), --查询字段

  @sys_Where nvarchar(3000), --查询条件

  @sys_Order nvarchar(100), --排序字段

  @sys_Begin int, --开始位置

  @sys_PageIndex int, --当前页数

  @sys_PageSize int --页大小

  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) --如果输入的当前页数大于实际总页数,则把实际总页数赋值给当前页数

  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