MySQL improves data paging efficiency

[Introduction] This code of mine is a test code to improve the efficiency of paging when there is a large amount of data--Improving the efficiency of paging: only reading the display data when implementing paging, you need to first create a database "TestForPaging" in the database use TestForPaginggo- -Create table SomeDatacreate table SomeData(id int

My code is a test code to improve the efficiency of paging when there is a large amount of data
--Improve paging efficiency: only read the display data when implementing paging, You need to first create the database "TestForPaging" in the database

use TestForPaging
go

--Create table SomeData

create table SomeData
(
id int primary key,
name varchar(30) null,
description text
)
go

--Insert data

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

-- Total number of data entries

select count(*) from SomeData
go

--Add a data level to each record

select name,description,ROW_NUMBER() over(order by id desc)as dataLevel from SomeData
go

--View data entries between specified data levels

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

--Implements the stored procedure for viewing data entries between specified data levels

create procedure GetDataPaged
(
@startRowIndex int,
@maximumRows int,
@sort varchar
)
AS

--Ensures that sort

if len(@sort)=0
set @sort='id'

--Query with parameters

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 <= (@startRowIndex*10 + @maximumRows)
go

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