php实现mysql读写分离

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

';  
            $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().'
';          
        }else{   
            echo 'I am using master db..
';  
            $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().'
';         
        }   
    }   
}   
   
$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 $