PHP implementation only retains the latest 1000 records in MySQL

This article mainly introduces the PHP implementation only to retain the latest 1000 records in MySQL methods and related examples and database structure, very comprehensive, the need for small partners can refer to.

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20-21

<?php mysql_connect ("localhost", "root", "root"); mysql_select_db ("test"); Keep the latest 1000 records $limit = 1000; $query = "Select ' id ' from ' News '"; $result =mysql_query ($query); $num =mysql_num_rows ($result); if ($num > $limit) {$query = ' select ' id ' from ' News ' ORDER by ' ID ' desc limit '. $limit; $result =mysql_query ($query); Mysql_data_seek ($result, $limit-1); $data =mysql_fetch_array ($result); $query = "Delete from ' news ' where ' id ' < ' $data [id] '"; if (mysql_query ($query)) {echo "original in Database". $num. " Record, superfluous. " ($num-$limit). " The record was successfully deleted and there is still ". $limit." Record! "; } } else{echo "Insufficient data logging". $limit. " Article No need to delete! "; } ? >

Test.sql

--phpMyAdmin SQL Dump

--Version 3.1.5-rc1

--Http://www.phpmyadmin.net

--

--Host: localhost

--Date Created: August 19, 2010 05:47

--Server version: 5.0.18

--PHP version: 5.2.8

SET sql_mode= "No_auto_value_on_zero";

/*!40101 SET @OLD_CHARACTER_SET_CLIENT =@ @CHARACTER_SET_CLIENT * *;

/*!40101 SET @OLD_CHARACTER_SET_RESULTS =@ @CHARACTER_SET_RESULTS * *;

/*!40101 SET @OLD_COLLATION_CONNECTION =@ @COLLATION_CONNECTION * *;

/*!40101 SET NAMES UTF8 * *;

--

--Database: ' Test '

--

-- --------------------------------------------------------

--

--The structure of the table ' News '

--

?

1 2 3 4 5

CREATE TABLE IF not EXISTS ' news ' (' id ' int (one) unsigned not null auto_increment, ' title ' varchar (256) NOT NULL, PRIMARY KEY (' id ') engine=innodb DEFAULT charset=gb2312;

The above mentioned is the entire content of this article, I hope you can enjoy.