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)。
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create database DBTestuse 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 intset @i=0while(@i<10000)begin insert into pagetest select cast(floor(rand()*10000) as int),left(newid(),10),getdate() set @i=@i+1end |
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
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select top 50 * from pagetestwhere id not in (select top 9900 id from pagetest order by id)order by id |
--写法2，not exists
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select top 50 * from pagetestwhere 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
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select top 50 * from pagetestwhere id>(select max(id) from (select top 9900 id from pagetest order by id)a)order by id |
--写法4，row_number()
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select top 50 * from(select row_number()over(order by id)rownumber,* from pagetest)awhere rownumber>9900 select * from(select row_number()over(order by id)rownumber,* from pagetest)awhere rownumber>9900 and rownumber<9951 select * from(select row_number()over(order by id)rownumber,* from pagetest)awhere 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
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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)bwhere rownumber>9900 |
3.分别在1万，10万(取1990页)，100(取19900页）记录集下测试。
测试sql:
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declare @begin_date datetimedeclare @end_date datetimeselect @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。
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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 @TotalCountEND |
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public 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; } /// <summary> /// 分页获取数据列表及总行数 /// </summary> /// <param name="tbName">表名</param> /// <param name="tbGetFields">返回字段</param> /// <param name="OrderFldName">排序的字段名</param> /// <param name="PageSize">页尺寸</param> /// <param name="PageIndex">页码</param> /// <param name="OrderType">false升序，true降序</param> /// <param name="strWhere">查询条件</param> public static DataSet GetPageList(string tbName, string tbGetFields, string OrderFldName, int PageSize, int PageIndex, string strWhere) { SqlParameter[] parameters = { MakeInParam("@tbName",SqlDbType.VarChar,255,tbName), MakeInParam("@tbGetFields",SqlDbType.VarChar,1000,tbGetFields), MakeInParam("@OrderfldName",SqlDbType.VarChar,255,OrderFldName), MakeInParam("@PageSize",SqlDbType.Int,0,PageSize), MakeInParam("@PageIndex",SqlDbType.Int,0,PageIndex), MakeInParam("@OrderType",SqlDbType.Bit,0,OrderType), MakeInParam("@strWhere",SqlDbType.VarChar,1000,strWhere), // MakeOutParam("@TotalCount",SqlDbType.Int) }; return RunProcedure("Proc_SqlPageByRownumber", parameters, "ds"); } |
调用：
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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：
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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")
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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asdeclare @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 !=''beginset @strSqlCount='Select @TotalCout=count(*) from ' + @tbName + ' where '+ @strWhereendelsebeginset @strSqlCount='Select @TotalCout=count(*) from ' + @tbNameend--------------分页------------if @PageIndex <= 0begin set @PageIndex = 1endset @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 outputexec(@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：
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declare @count int--exec [dbo].[spSqlPageByRownumber]'pagetest','*',50,20,'','order by id asc',@count outputexec [dbo].[spSqlPageByMaxTop]'pagetest','*',50,20,'','order by id asc',@count outputselect @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。
