SqlServer存储过程分页：大数据量分页存储过程效率测试附代码
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在项目中，我们经常遇到或用到分页，那么在大数据量（百万级以上）下，哪种分页算法效率最优呢？我们不妨用事实说话。 ? ? 测试环境 ? 硬件：CPU 酷睿双核T5750 内存：2G ? 软件:Windows server 2003 + Sql server 2005 ? ? OK,我们首先创建一数据库：data_Test,并在此数据库中创建一表：tb_TestTable ? ? 1create database data_Test --创建数据库data_Test? 2GO? use data_Test? GO? create table tb_TestTable --创建表? (? ?id int identity(1,1) primary key,? ?userName nvarchar(20) not null,? ?userPWD nvarchar(20) not null,? ?userEmail nvarchar(40) null? )? GO ? ? --然后我们在数据表中插入2000000条数据: ? ? --插入数据? set identity_insert tb_TestTable on? declare @count int? set @count=1? while @count<=2000000? begin? ?insert into tb_TestTable(id,userName,userPWD,userEmail) values(@count,'admin','admin888','lli0077@yahoo.com.cn')? ?set @count=@count+1? end? set identity_insert tb_TestTable off ? ? --我首先写了五个常用存储过程： ? --1，利用select top 和select not in进行分页，具体代码如下： ? create procedure proc_paged_with_notin --利用select top and select not in? (? ?@pageIndex int,--页索引? ?@pageSize int --每页记录数? )? as? begin? ?set nocount on;? ?declare @timediff datetime --耗时? ?declare @sql nvarchar(500)? ?select @timediff=Getdate()? ?set @sql='select top '+str(@pageSize)+' * from tb_TestTable where(ID not in(select top '+str(@pageSize*@pageIndex)+' id from tb_TestTable order by ID ASC)) order by ID'? ?execute(@sql) --因select top后不支技直接接参数，所以写成了字符串@sql? ?select datediff(ms,@timediff,GetDate()) as 耗时? ?set nocount off;? end ? ? --2,利用select top 和 select max(列键) ? ? create procedure proc_paged_with_selectMax --利用select top and select max(列)? (? ?@pageIndex int,--页索引? ?@pageSize int --页记录数? )? as? begin? set nocount on;? ?declare @timediff datetime? ?declare @sql nvarchar(500)? ?select @timediff=Getdate()? ?set @sql='select top '+str(@pageSize)+' * From tb_TestTable where(ID>(select max(id) From (select top '+str(@pageSize*@pageIndex)+' id From tb_TestTable order by ID) as TempTable)) order by ID'? ?execute(@sql)? ?select datediff(ms,GetDate()) as 耗时? set nocount off;? end ? ? --3,利用select top和中间变量--此方法因网上有人说效果最佳，所以贴出来一同测试 ? create procedure proc_paged_with_Midvar --利用ID>最大ID值和中间变量? (? ?@pageIndex int,? ?@pageSize int? )? as? ?declare @count int? ?declare @ID int? ?declare @timediff datetime? ?declare @sql nvarchar(500)? begin? set nocount on;? ?select @count=0,@ID=0,@timediff=getdate()? ?select @count=@count+1,@ID=case when @count<=@pageSize*@pageIndex then ID else @ID end from tb_testTable order by id? ?set @sql='select top '+str(@pageSize)+' * from tb_testTable where ID>'+str(@ID)? ?execute(@sql)? ?select datediff(ms,getdate()) as 耗时? set nocount off;? end ? ? ? --4,利用Row_number() 此方法为SQL server 2005中新的方法,利用Row_number()给数据行加上索引 ? ? create procedure proc_paged_with_Rownumber --利用SQL 2005中的Row_number()? (? ?@pageIndex int,? ?@pageSize int? )? as? ?declare @timediff datetime? begin? set nocount on;? ?select @timediff=getdate()? ?select * from (select *,Row_number() over(order by ID asc) as IDRank from tb_testTable) as IDWithRowNumber where IDRank>@pageSize*@pageIndex and IDRank<@pageSize*(@pageIndex+1)? ?select datediff(ms,getdate()) as 耗时? set nocount off;? end ? ? --5，利用临时表及Row_number ? create procedure proc_CTE --利用临时表及Row_number? (? ?@pageIndex int,--页索引? ?@pageSize int --页记录数? )? as? ?set nocount on;? ?declare @ctestr nvarchar(400)? ?declare @strSql nvarchar(400)? ?declare @datediff datetime? begin? ?select @datediff=GetDate()? ?set @ctestr='with Table_CTE as? ?(select ceiling((Row_number() over(order by ID ASC))/'+str(@pageSize)+') as page_num,* from tb_TestTable)';? ?set @strSql=@ctestr+' select * From Table_CTE where page_num='+str(@pageIndex)? end? ?begin? ?execute sp_executesql @strSql? ?select datediff(ms,@datediff,GetDate())? ?set nocount off;? ?end ? ? ? --OK,至此，存储过程创建完毕，我们分别在每页10条数据的情况下在第2页，第1000页，第10000页，第100000页，第199999页进行测试，耗时单位：ms 每页测试5次取其平均值 ? --存过 第2页耗时 第1000页耗时 第10000页耗时 第100000页耗时 第199999页耗时 效率排行? --1用not in 0ms 16ms 47ms 475ms 953ms 3? --2用select max 5ms 16ms 35ms 325ms 623ms 1? --3中间变量 966ms 970ms 960ms 945ms 933ms 5? --4row_number 0ms 0ms 34ms 365ms 710ms 2? --4临时表 780ms 796ms 798ms 780ms 805ms 4 ? --测试结果显示：select max >row_number>not in>临时表>中间变量 ? ? --于是我对效率最高的select max方法用2分法进行了扩展，代码取自互联网，我修改了ASC排序时取不到值的BUG，测试结果: ? --2分法 156ms 156ms 180ms 470ms 156ms 1* ? ? --从测试结果来看，使用2分法确实可以提高效率并使效率更为稳定，我又增加了第159999页的测试，用时仅296ms，效果相当的不错！ ? ? --下面是2分法使用select max的代码，已相当完善。 ? ? --/*-----存储过程 分页处理 孙伟 2005-03-28创建 -------*/? --/*-----存储过程 分页处理 浪尘 2008-9-1修改----------*/? --/*----- 对数据进行了2分处理使查询前半部分数据与查询后半部分数据性能相同 -------*/? ? alter PROCEDURE proc_paged_2part_selectMax? (? @tblName nvarchar(200),----要显示的表或多个表的连接? @fldName nvarchar(500) = '*',----要显示的字段列表? @pageSize int = 10,----每页显示的记录个数? @page int = 1,----要显示那一页的记录? @fldSort nvarchar(200) = null,----排序字段列表或条件? @Sort bit = 0,----排序方法，0为升序，1为降序(如果是多字段排列Sort指代最后一个排序字段的排列顺序(最后一个排序字段不加排序标记)--程序传参如：' SortA Asc,SortB Desc,SortC ')? @strCondition nvarchar(1000) = null,----查询条件,不需where? @ID nvarchar(150),----主表的主键? @Dist bit = 0,----是否添加查询字段的 DISTINCT 默认0不添加/1添加? @pageCount int = 1 output,----查询结果分页后的总页数? @Counts int = 1 output ----查询到的记录数? )? AS? SET NOCOUNT ON? Declare @sqlTmp nvarchar(1000) ----存放动态生成的SQL语句? Declare @strTmp nvarchar(1000) ----存放取得查询结果总数的查询语句? Declare @strID nvarchar(1000) ----存放取得查询开头或结尾ID的查询语句? ? Declare @strSortType nvarchar(10) ----数据排序规则A? Declare @strFSortType nvarchar(10) ----数据排序规则B? ? Declare @SqlSelect nvarchar(50) ----对含有DISTINCT的查询进行SQL构造? Declare @SqlCounts nvarchar(50) ----对含有DISTINCT的总数查询进行SQL构造? ? declare @timediff datetime --耗时测试时间差? select @timediff=getdate()? ? if @Dist = 0? begin? ?set @SqlSelect = 'select '? ?set @SqlCounts = 'Count(*)'? end? else? begin? ?set @SqlSelect = 'select distinct '? ?set @SqlCounts = 'Count(DISTINCT '+@ID+')'? end? ? ? if @Sort=0? begin? ?set @strFSortType=' ASC '? ?set @strSortType=' DESC '? end? else? begin? ?set @strFSortType=' DESC '? ?set @strSortType=' ASC '? end? ? ? ? --------生成查询语句--------? --此处@strTmp为取得查询结果数量的语句? if @strCondition is null or @strCondition='' --没有设置显示条件? begin? ?set @sqlTmp = @fldName + ' From ' + @tblName? ?set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName? ?set @strID = ' From ' + @tblName? end? else? begin? ?set @sqlTmp = + @fldName + 'From ' + @tblName + ' where (1>0) ' + @strCondition? ?set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName + ' where (1>0) ' + @strCondition? ?set @strID = ' From ' + @tblName + ' where (1>0) ' + @strCondition? end? ? ----取得查询结果总数量-----? exec sp_executesql @strTmp,N'@Counts int out ',@Counts out? declare @tmpCounts int? if @Counts = 0? ?set @tmpCounts = 1? else? ?set @tmpCounts = @Counts? ? ?--取得分页总数? ?set @pageCount=(@tmpCounts+@pageSize-1)/@pageSize? ? ?/**//**//**//**当前页大于总页数 取最后一页**/? ?if @page>@pageCount? ?set @page=@pageCount? ? ?--/*-----数据分页2分处理-------*/? ?declare @pageIndex int --总数/页大小? ?declare @lastcount int --总数%页大小? ? ?set @pageIndex = @tmpCounts/@pageSize? ?set @lastcount = @tmpCounts%@pageSize? ?if @lastcount > 0? ?set @pageIndex = @pageIndex + 1? ?else? ?set @lastcount = @pagesize? ? ?--//***显示分页? ?if @strCondition is null or @strCondition='' --没有设置显示条件? ?begin? ?if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2 --前半部分数据处理? ?begin? ?if @page=1? ?set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName? ?+' order by '+ @fldSort +' '+ @strFSortType? ?else? ?begin? ?if @Sort=1? ?begin? ?set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName? ?+' where '+@ID+' <(select min('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName? ?+' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'? ?+' order by '+ @fldSort +' '+ @strFSortType? ?end? ?else? ?begin? ?set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName? ?+' where '+@ID+' >(select max('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName? ?+' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'? ?+' order by '+ @fldSort +' '+ @strFSortType? ?end? ?end? ?end? ?else? ?begin? ?set @page = @pageIndex-@page+1 --后半部分数据处理? ?if @page <= 1 --最后一页数据显示? ?set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR(4))+' '+ @fldName+' from '+@tblName? ?+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType? ?else? ?if @Sort=1? ?begin? ?set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName? ?+' where '+@ID+' >(select max('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName? ?+' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'? ?+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType? ?end? ?else? ?begin? ?set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName? ?+' where '+@ID+' <(select min('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName? ?+' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'? ?+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType? ?end? ?end? ?end? ? ?else --有查询条件? ?begin? ?if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2 --前半部分数据处理? ?begin? ?if @page=1? ?set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName? ?+' where 1=1 ' + @strCondition + ' order by '+ @fldSort +' '+ @strFSortType? ?else if(@Sort=1)? ?begin? ?set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName? ?+' where '+@ID+' <(select min('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName? ?+' where (1=1) ' + @strCondition +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'? ?+' '+ @strCondition +' order by '+ @fldSort +' '+ @strFSortType? ?end? ?else? ?begin? ?set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName? ?+' where '+@ID+' >(select max('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName? ?+' where (1=1) ' + @strCondition +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'? ?+' '+ @strCondition +' order by '+ @fldSort +' '+ @strFSortType? ?end? ?end? ?else? ?begin? ?set @page = @pageIndex-@page+1 --后半部分数据处理? ?if @page <= 1 --最后一页数据显示? ?set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR(4))+' '+ @fldName+' from '+@tblName? ?+' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType? ?else if(@Sort=1)? ?set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName? ?+' where '+@ID+' >(select max('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName? ?+' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'? ?+' '+ @strCondition+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType? ?else? ?set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName? ?+' where '+@ID+' <(select min('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName? ?+' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'? ?+' '+ @strCondition+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType? ?end? ?end? ? ------返回查询结果-----? exec sp_executesql @strTmp? select datediff(ms,getdate()) as 耗时? --print @strTmp? SET NOCOUNT OFF? GO ? ? ? --执行示例：exec proc_paged_2part_selectMax 'tb_testTable','ID,userEmail',10,100000,'ID',null,0 ? --这种测试只在单机进行，并且没有在实际开发WEB项目中分页测试，测试项也比较单一，所以不够全面系统，但从其效率相比上，我们可以在数据库分页算法上进行有效的控制。 （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |