关于SQL语句分页,网上也有很多,我贴一部分过来,并且总结自己已知的分页到下面,方便日后查阅
1.创建测试环境
,(插入100万条数据大概耗时5分钟)。
create database DBTest use DBTest
--创建测试表create table pagetest (id int identity(1,1) not null,col01 int null,col02 nvarchar(50) null,col03 datetime null)
--1万记录集declare @i int set @i=0 while(@i<10000) begin insert into pagetest select cast(floor(rand()*10000) as int),left(newid(),10),getdate() set @i=@i+1 end
2.几种典型的分页sql
,下面例子是每页50条,198*50=9900,取第199页数据。
--写法1,not in/top
select top 50 * from pagetest where id not in (select top 9900 id from pagetest order by id) order by id--写法2,not exists
select top 50 * from pagetest where not exists (select 1 from (select top 9900 id from pagetest order by id)a where a.id=pagetest.id) order by id--写法3,max/top
select top 50 * from pagetest where id>(select max(id) from (select top 9900 id from pagetest order by id)a) order by id--写法4,row_number()
select top 50 * from (select row_number()over(order by id)rownumber,* from pagetest)a where rownumber>9900
select * from (select row_number()over(order by id)rownumber,* from pagetest)a where rownumber>9900 and rownumber<9951
select * from (select row_number()over(order by id)rownumber,* from pagetest)a where rownumber between 9901 and 9950
--写法5,在csdn上一帖子看到的,row_number() 变体,不基于已有字段产生记录序号,先按条件筛选以及排好序,再在结果集上给一常量列用于产生记录序号
select *from (select row_number()over(order by tempColumn)rownumber,*from (select top 9950 tempColumn=0,* from pagetest where 1=1 order by id)a)b where rownumber>99003.分别在1万,10万(取1990页),100(取19900页)记录集下测试。
测试sql:declare @begin_date datetime declare @end_date datetime select @begin_date = getdate()<.....YOUR CODE.....>select @end_date = getdate() select datediff(ms,@begin_date,@end_date) as '毫秒'1万:基本感觉不到差异。
10万:
4.结论:
1.max/top,ROW_NUMBER()都是比较不错的分页方法。相比ROW_NUMBER()只支持sql2005及以上版本,max/top有更好的可移植性,能同时适用于sql2000,access。
2.not exists感觉是要比not in效率高一点点。
3.ROW_NUMBER()的3种不同写法效率看起来差不多。
4.ROW_NUMBER() 的变体基于我这个测试效率实在不好。原帖在这里http://topic.csdn.net/u/20100617/04/80d1bd99-2e1c-4083-ad87-72bf706cb536.html PS.上面的分页排序都是基于自增字段id。测试环境还提供了int,nvarchar,datetime类型字段,也可以试试。不过对于非主键没索引的大数据量排序效率应该是很不理想的。
5.简单将ROWNUMBER,max/top的方式封装到存储过程。
ROWNUMBER():
ALTER PROCEDURE [dbo].[Proc_SqlPageByRownumber](@tbName VARCHAR(255), --表名@tbGetFields VARCHAR(1000)= '*',--返回字段@OrderfldName VARCHAR(255), --排序的字段名@PageSize INT=20, --页尺寸@PageIndex INT=1, --页码@OrderType bit = 0, --0升序,非0降序@strWhere VARCHAR(1000)='', --查询条件--@TotalCount INT OUTPUT --返回总记录数) AS-- =============================================-- Author: allen (liyuxin)-- Create date: 2012-03-30-- Description: 分页存储过程(支持多表连接查询)-- Modify [1]: 2012-03-30-- =============================================BEGIN DECLARE @strSql VARCHAR(5000) --主语句DECLARE @strSqlCount NVARCHAR(500)--查询记录总数主语句DECLARE @strOrder VARCHAR(300) -- 排序类型
--------------总记录数---------------IF ISNULL(@strWhere,'') <>''SET @strSqlCount='Select @TotalCout=count(*) from ' + @tbName + ' where 1=1 '+ @strWhere ELSE SET @strSqlCount='Select @TotalCout=count(*) from ' + @tbName
--exec sp_executesql @strSqlCount,N'@TotalCout int output',@TotalCount output--------------分页------------IF @PageIndex <= 0 SET @PageIndex = 1
IF(@OrderType<>0) SET @strOrder=' ORDER BY '+@OrderfldName+' DESC 'ELSE SET @strOrder=' ORDER BY '+@OrderfldName+' ASC '
SET @strSql='SELECT * FROM (SELECT ROW_NUMBER() OVER('+@strOrder+') RowNo,'+ @tbGetFields+' FROM ' + @tbName + ' WHERE 1=1 ' + @strWhere+' ) tb WHERE tb.RowNo BETWEEN '+str((@PageIndex-1)*@PageSize+1)+' AND ' +str(@PageIndex*@PageSize)
exec(@strSql) SELECT @TotalCount ENDpublic static SqlParameter MakeInParam(string ParamName, SqlDbType DbType, Int32 Size, object Value){return MakeParam(ParamName, DbType,Size, ParameterDirection.Input, Value);}public static SqlParameter MakeOutParam(string ParamName, SqlDbType DbType){return MakeParam(ParamName, DbType, 0, ParameterDirection.Output, null);}public static SqlParameter MakeParam(string ParamName, SqlDbType DbType, Int32 Size, ParameterDirection Direction, object Value){SqlParameter param;if (Size > 0) param = new SqlParameter(ParamName, DbType, Size);else param = new SqlParameter(ParamName, DbType);param.Direction = Direction;if (!(Direction == ParameterDirection.Output && Value == null)) param.Value = Value;return param;}///
调用:
public DataTable GetList(string tbName, string tbGetFields, string OrderFldName, int PageSize, int PageIndex, string strWhere, ref int TotalCount){DataSet ds = dal.GetList(tbName, tbGetFields, OrderFldName, PageSize, PageIndex, strWhere);TotalCount = Convert.ToInt32(ds.Tables[1].Rows[0][0]);return ds.Tables[0];}注意:多表连接时需注意的地方
1.必填项:tbName,OrderfldName,tbGetFields
2.实例:
tbName =“UserInfo u INNER JOIN Department d ON u.DepID=d.ID”
tbGetFields=“u.ID AS UserID,u.Name,u.Sex,d.ID AS DepID,d.DefName”
OrderfldName=“u.ID,ASC|u.Name,DESC” (格式:Name,ASC|ID,DESC) strWhere:每个条件前必须添加 AND (例如:AND UserInfo.DepID=1 )
Max/top:(简单写了下,需要满足主键字段名称就是"id")create proc [dbo].[spSqlPageByMaxTop]@tbName varchar(255), --表名@tbFields varchar(1000), --返回字段@PageSize int, --页尺寸@PageIndex int, --页码@strWhere varchar(1000), --查询条件@StrOrder varchar(255), --排序条件@Total int output --返回总记录数as declare @strSql varchar(5000) --主语句declare @strSqlCount nvarchar(500)--查询记录总数主语句
--------------总记录数---------------if @strWhere !=''begin set @strSqlCount='Select @TotalCout=count(*) from ' + @tbName + ' where '+ @strWhere end else begin set @strSqlCount='Select @TotalCout=count(*) from ' + @tbName end--------------分页------------if @PageIndex <= 0 begin set @PageIndex = 1 end
set @strSql='select top '+str(@PageSize)+' * from ' + @tbName + 'where id>(select max(id) from (select top '+str((@PageIndex-1)*@PageSize)+' id from ' + @tbName + ''+@strOrder+')a)'+@strOrder+''
exec sp_executesql @strSqlCount,N'@TotalCout int output',@Total output exec(@strSql)园子里搜到Max/top这么一个版本,看起来很强大,http://www.cnblogs.com/hertcloud/archive/2005/12/21/301327.html
调用:
declare @count int--exec [dbo].[spSqlPageByRownumber]'pagetest','*',50,20,'','order by id asc',@count output exec [dbo].[spSqlPageByMaxTop]'pagetest','*',50,20,'','order by id asc',@count output select @count以上就是本文针对sql分页查询几种写法的全部内容,希望大家喜欢。
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