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MySQL improves data paging efficiency

黄舟

Release： 2017-02-20 11:48:31

Original

1263 people have browsed it

[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

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--Create table SomeData

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

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--Insert data

insert into SomeData values(1,&#39;num1&#39;,&#39;第1条&#39;)
go
insert into SomeData values(2,&#39;num2&#39;,&#39;第2条&#39;)
go
insert into SomeData values(3,&#39;num3&#39;,&#39;第3条&#39;)
go
insert into SomeData values(4,&#39;num4&#39;,&#39;第4条&#39;)
go
insert into SomeData values(5,&#39;num5&#39;,&#39;第5条&#39;)
go

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-- Total number of data entries

select count(*) from SomeData
go

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--Add a data level to each record

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

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--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

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

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

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--Ensures that sort

if len(@sort)=0
set @sort=&#39;id&#39;

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--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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