MySQL paging

Why pagination

When we need to query too much data , When a page cannot fit , Paging can give us only partial data at one time .

Pagination principle

stay Mysql in , Paginated SQL The sentence is ：

select * from table_name limit frontIndex,pageSize

Key words are used here limit, It means that the name of the query table is table_name All of , From the subscript for frontIndex The line of begins to check （ The subscript on the first line is 0）, Inquire about pageSize Data .

There's another use :

select * from table_name limit pageSize

What's different from the above is , This method indicates that the subscript is 0 Start , Inquire about pageSize Data , That is, query subscript from [0,pageSize) The data of , Left closed right away

It is not difficult for us to see from the above , The essence of paging is to query some data according to the interval .