[导读] 我的这段代码是大数据量时提高分页的效率的测试代码–提高分页效率:实现分页时只读取显示数据,需要先在数据库创建数据库“testforpaging”use testforpaginggo–创建表somedatacreate table somedata(id int
我的这段代码是大数据量时提高分页的效率的测试代码
–提高分页效率:实现分页时只读取显示数据,需要先在数据库创建数据库“TestForPaging”
use TestForPaging
go
–创建表SomeData
create table SomeData
(
id int primary key,
name varchar(30) null,
description text
)
go
–插入数据
insert into SomeData values(1,’num1′,’第1条’)
go
insert into SomeData values(2,’num2′,’第2条’)
go
insert into SomeData values(3,’num3′,’第3条’)
go
insert into SomeData values(4,’num4′,’第4条’)
go
insert into SomeData values(5,’num5′,’第5条’)
go
–数据条目总数
select count(*) from SomeData
go
–给每条记录添加一个数据级别
select name,description,ROW_NUMBER() over(order by id desc)as dataLevel from SomeData
go
–查看指定的数据级别间的数据条目
select dataLevel,name,description from
(select name,description,row_number() over(order by id desc)as dataLevel from SomeData)
as datawithleverl where dataLevel between 2 and 4
go
–实现查看指定的数据级别间的数据条目的存储过程
create procedure GetDataPaged
(
@startRowIndex int,
@maximumRows int,
@sort varchar
)
AS
–确保指定sort
if len(@sort)=0
set @sort=’id’
–带参数的查询
select dataLevel,name,description from
(select name,description,row_number() over(order by @sort desc)as dataLevel from SomeData) AS datawithleverl
WHERE dataLevel > (@startRowIndex*10) AND dataLevel go
