毫秒级百万数据分页存储过程
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()*(@[email protected])[email protected]) 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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SELECT [当前页] = @cPage,[分页执行耗时间(毫秒)] = DATEDIFF(ms,@d,GETDATE())
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在我的机器上面测试均为毫秒级!!!!
园子里的高手若有更好的方法欢迎分享一下!!!!!!!!!!!!!!!
转载于:https://www.cnblogs.com/tianlong/archive/2010/11/26/1888665.html