PHP implementation only preserves the latest 1000 records in MySQL _php tutorial

PHP implementation keeps only the latest 1000 records in MySQL

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

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!--? php My Sql_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)) { ". $num in the echo database." Record, superfluous ". ($num-$limit). " The record was successfully deleted and is now remaining ". $limit." Record! "; } }else{ echo "Insufficient data record". $limit. " Reviews No need to delete! "; } ?

Test.sql

--PhpMyAdmin SQL Dump

--Version 3.1.5-rc1

--Http://www.phpmyadmin.net

--

--Host: localhost

--Date of generation: 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 '

--

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

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