PHP实现的mysql读写分离操作示例

本文实例讲述了PHP实现的mysql读写分离操作。分享给大家供大家参考，具体如下：首先mysql

本文实例讲述了PHP实现的mysql读写分离操作。分享给大家供大家参考，具体如下：

首先mysql主从需配置好，基本原理就是判断sql语句是否是select，是的话走master库，否则从slave查

<?php
/**
* mysql读写分离
*/
class db{
 public function __construct($sql){
 $chestr = strtolower(trim($sql));
 //判断sql语句有select关键字的话，就连接读的数据库,否则就连接写数据库
 if(substr($chestr,0,6)=='select')
 {
 echo 'I am using slave db..<br>';
 $link = mysql_connect("192.168.20.201:3306", "open", "123456") or die("Could not connect: " . mysql_error());
 mysql_select_db("hadoop");
 $result = mysql_query($sql);
 while($row = mysql_fetch_array($result,MYSQL_ASSOC)){
 $data[]=$row;
 }
 //print_r($data);exit;
 echo mysql_get_host_info($link).mysql_get_server_info($link).mysql_get_proto_info($link).mysql_get_client_info().'<br>';
 }else{
 echo 'I am using master db..<br>';
 $link = mysql_connect("192.168.20.195:3306","open","123456") or die("Could not connect: " . mysql_error());
 mysql_select_db("hadoop");
 $result = mysql_query($sql);
 //echo @mysql_affected_rows($result);
 echo mysql_get_host_info($link).mysql_get_server_info($link).mysql_get_proto_info($link).mysql_get_client_info().'<br>';
 }
 }
}
$master = new db("INSERT INTO user (id,name)VALUES (NULL,'100')");
$slave = new db("SELECT * from `user`");

结果：

I am using master db.. 192.168.20.195 via TCP/IP5.1.73-log10mysqlnd 5.0.8-dev - 20102224 - $Id: 731e5b87ba42146a687c29995d2dfd8b4e40b325 $ I am using slave db.. 192.168.20.201 via TCP/IP5.1.73-log10mysqlnd 5.0.8-dev - 20102224 - $Id: 731e5b87ba42146a687c29995d2dfd8b4e40b325 $