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 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
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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 pagetest
where id not in ( select top 9900 id from pagetest order by id)
order by id
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--写法2,not exists
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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
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--写法3,max/top
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select top 50 * from pagetest
where id>( select max (id) from ( select top 9900 id from pagetest order by id)a)
order by id
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--写法4,row_number()
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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
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--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
)b
where rownumber>9900
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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 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'
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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 @TotalCount
END
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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" );
}
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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];
}
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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 )
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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
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)
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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 output
exec [dbo].[spSqlPageByMaxTop] 'pagetest' , '*' ,50,20, '' , 'order by id asc' ,@ count output
select @ count
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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。