毫秒级百万数据分页存储过程

原文地址：http://www.searchdatabase.com.cn/showcontent_43246.htm

　数据分页一直是一个经久不衰的话题，今天把我使用的分页代码继续分享，首先生成一个百万数据表;耗时 33 秒;

　　然后创建分页存储过程;这个是基于SQL 2005 的ROW_NUMBER的，SQL 2000 不适; SQL 2008 我没有安装，所以也没有测试过，估计应该可以运行。

　　2种算法可以选择 1. 使用 BETWEEN ; 2. TOP ; 代码中已经注释了.

　　我测试了一下2种方法基本没有什么区别;代码如下:

USE [DATA_TEMP]
GO
/****** 对象:  StoredProcedure [dbo].[im531_Page]    脚本日期: 11/26/2010 10:52:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:  im531
-- Create date: 2010-10-25
-- Description: SQL 2005 ROW_NUMBER 分页
-- Modify Date: 2010-10-26
-- =============================================
CREATE PROCEDURE [dbo].[im531_Page]
@TabeName AS NVARCHAR(50),
@Fields AS NVARCHAR(1024),
@SearchWhere AS NVARCHAR(1024),
@OrderFields AS NVARCHAR(1024),
@pageNumber AS INT,
@page AS INT
AS
BEGIN
SET NOCOUNT ON;
DECLARE @sqlType AS TINYINT
SET @sqlType = 0  -- 0 BETWEEN   1 TOP
DECLARE @sql AS NVARCHAR(MAX)
IF @SearchWhere <> '' SET @SearchWhere = ' WHERE ' + @SearchWhere
IF @page < 2 SET @page = 1
IF @page = 1
  BEGIN
   SET @sql = 'SELECT TOP ' + CONVERT(NVARCHAR(20),@pageNumber) + ' ' + @Fields
    + 'FROM [' + @TabeName + '][a] WITH(NOLOCK) ' + @SearchWhere + ' ORDER BY ' + @OrderFields
  END
ELSE
  BEGIN
   --临时表
   SET @sql = ';WITH [Page_____Table] AS('
    + 'SELECT ROW_NUMBER() OVER(ORDER BY ' + @OrderFields + ') AS [RowNow],' + @Fields
    + 'FROM ['+ @TabeName +' ][a] WITH(NOLOCK) ' + @SearchWhere
    + ')'
   --查找当前页面记录
   IF @sqlType = 0
    BEGIN
    -- A USE BETWEEN
     SET @sql = @sql + 'SELECT *'
      + 'FROM [Page_____Table] WITH(NOLOCK)'
      + 'WHERE [RowNow] BETWEEN ' + CONVERT(NVARCHAR(20),(@page - 1) * @pageNumber + 1) + ' AND ' + CONVERT(NVARCHAR(20),@page * @pageNumber)
      + 'ORDER BY [RowNow]'
    END
   ELSE
    BEGIN
    -- B USE TOP
     SET @sql = @sql + 'SELECT TOP ' + CONVERT(NVARCHAR(20),@pageNumber) + ' *'
      + 'FROM [Page_____Table] WITH(NOLOCK)'
      + 'WHERE [RowNow] > ' + CONVERT(NVARCHAR(20),(@page - 1) * @pageNumber)
      + 'ORDER BY [RowNow]'
    END
  END
EXEC(@sql)
END

　　然后测试分页性能;每页显示20条记录, 百万数据最大50000页,当前页采用随机数取值;

DECLARE @d DATETIME
SET @d = GETDATE()
DECLARE @M AS INT;DECLARE @N AS INT;DECLARE @cPage AS INT
SET @M = 50000;SET @N = 1
SET @cPage = CAST((rand()*(@M-@N)+@N) AS INT)
EXECUTE [im531_Page]
@TabeName = 'Table_1',
@Fields = '[a],[b]',
@SearchWhere = '[a] > 0',
@OrderFields = '[a] DESC',
@pageNumber = 20,
@page = @cPage

SELECT [当前页] = @cPage,[分页执行耗时间(毫秒)] = DATEDIFF(ms,@d,GETDATE())

　　在我的机器上面测试均为毫秒级!!!!