毫秒级百万数据分页存储过程zz
数据分页一直是一个经久不衰的话题,在园子里看到了N多高手,都比我厉害,
今天把我使用的分页代码继续分享;请高手手下留情,少拍砖啦...哈哈;
欢迎大家转载!!!!
首先参考园子里的高手方法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 不适用; 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:
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USE [DATA_TEMP] |
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GO |
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/****** 对象: StoredProcedure [dbo].[im531_Page] 脚本日期: 11/26/2010 10:52:35 ******/ |
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SET ANSI_NULLS ON |
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GO |
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SET QUOTED_IDENTIFIER ON |
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GO |
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-- ============================================= |
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-- Author: im531 |
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-- Create date: 2010-10-25 |
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-- Description: SQL 2005 ROW_NUMBER 分页 |
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-- Modify Date: 2010-10-26 |
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-- ============================================= |
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CREATE PROCEDURE [dbo].[im531_Page] |
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@TabeName AS NVARCHAR(50), |
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@Fields AS NVARCHAR(1024), |
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@SearchWhere AS NVARCHAR(1024), |
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@OrderFields AS NVARCHAR(1024), |
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@pageNumber AS INT, |
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@page AS INT |
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AS |
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BEGIN |
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SET NOCOUNT ON; |
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DECLARE @sqlType AS TINYINT |
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SET @sqlType = 0 -- 0 BETWEEN 1 TOP |
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DECLARE @sql AS NVARCHAR(MAX) |
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IF @SearchWhere <> '' SET @SearchWhere = ' WHERE ' + @SearchWhere |
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IF @page < 2 SET @page = 1 |
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IF @page = 1 |
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BEGIN |
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SET @sql = 'SELECT TOP ' + CONVERT(NVARCHAR(20),@pageNumber) + ' ' + @Fields |
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+ 'FROM [' + @TabeName + '][a] WITH(NOLOCK) ' + @SearchWhere + ' ORDER BY ' + @OrderFields |
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END |
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ELSE |
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BEGIN |
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--临时表 |
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SET @sql = ';WITH [Page_____Table] AS(' |
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+ 'SELECT ROW_NUMBER() OVER(ORDER BY ' + @OrderFields + ') AS [RowNow],' + @Fields |
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+ 'FROM ['+ @TabeName +' ][a] WITH(NOLOCK) ' + @SearchWhere |
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+ ')' |
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--查找当前页面记录 |
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IF @sqlType = 0 |
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BEGIN |
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-- A USE BETWEEN |
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SET @sql = @sql + 'SELECT *' |
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+ 'FROM [Page_____Table] WITH(NOLOCK)' |
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+ 'WHERE [RowNow] BETWEEN ' + CONVERT(NVARCHAR(20),(@page - 1) * @pageNumber + 1) + ' AND ' +CONVERT(NVARCHAR(20),@page * @pageNumber) |
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+ 'ORDER BY [RowNow]' |
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END |
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ELSE |
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BEGIN |
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-- B USE TOP |
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SET @sql = @sql + 'SELECT TOP ' + CONVERT(NVARCHAR(20),@pageNumber) + ' *' |
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+ 'FROM [Page_____Table] WITH(NOLOCK)' |
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+ 'WHERE [RowNow] > ' + CONVERT(NVARCHAR(20),(@page - 1) * @pageNumber) |
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+ 'ORDER BY [RowNow]' |
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END |
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END |
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EXEC(@sql) |
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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;
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DECLARE @d DATETIME |
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SET @d = GETDATE() |
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DECLARE @M AS INT;DECLARE @N AS INT;DECLARE @cPage AS INT |
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SET @M = 50000;SET @N = 1 |
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SET @cPage = CAST((rand()*(@M-@N)+@N) AS INT) |
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EXECUTE [im531_Page] |
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@TabeName = 'Table_1', |
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@Fields = '[a],[b]', |
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@SearchWhere = '[a] > 0', |
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@OrderFields = '[a] DESC', |
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@pageNumber = 20, |
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@page = @cPage |
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16 |
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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!!!!
转自im531的博客http://www.cnblogs.com/im531/
