php实现mysql读写分离

电玩女神 2022-09-25 00:23 177阅读 0赞

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 $