mysql Proxy读写分离配置与php mysql读写分离类

mysql-proxy
–proxy-backend-addresses=narcissus:3306
–proxy-backend-addresses=nostromo:3306

mysql-proxy
–proxy-backend-addresses=192.168.18.110:3306
–proxy-read-only-backend-addresses=192.168.18.107:3306
 

<?php 
class mysql_rw_php { 
    //查询个数 
    var $querynum = 0; 
    //当前操作的数据库连接 
    var $link = null; 
    //字符集 
    var $charset; 
    //当前数据库 
    var $cur_db = ''; 
 
    //是否存在有效的只读数据库连接 
    var $ro_exist = false; 
    //只读数据库连接 
    var $link_ro = null; 
    //读写数据库连接 
    var $link_rw = null; 
 
    function mysql_rw_php(){ 
    } 
 
    function connect($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0, $halt = TRUE) { 
        if($pconnect) { 
            if(!$this->link = @mysql_pconnect($dbhost, $dbuser, $dbpw)) { 
                $halt && $this->halt('Can not connect to MySQL server'); 
            } 
        } else { 
            if(!$this->link = @mysql_connect($dbhost, $dbuser, $dbpw)) { 
                $halt && $this->halt('Can not connect to MySQL server'); 
            } 
        } 
         
        //只读连接失败 
        if(!$this->link && !$halt) return false; 
         
        //未初始化rw时，第一个连接作为rw 
        if($this->link_rw == null) 
            $this->link_rw = $this->link; 
 
        if($this->version() > '4.1') { 
            if($this->charset) { 
                @mysql_query("SET character_set_connection=$this->charset, character_set_results=$this->charset, character_set_client=binary", $this->link); 
            } 
            if($this->version() > '5.0.1') { 
                @mysql_query("SET sql_mode=''", $this->link); 
            } 
        } 
        if($dbname) { 
            $this->select_db($dbname); 
        } 
    } 
 
    //连接一个只读的mysql数据库 
    function connect_ro($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0){ 
        if($this->link_rw == null) 
            $this->link_rw = $this->link; 
        $this->link = null; 
        //不产生halt错误 
        $this->connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect, false); 
        if($this->link){ 
            //连接成功 
            //echo "link ro sussess!<br>"; 
            $this->ro_exist = true; 
            $this->link_ro = $this->link; 
            if($this->cur_db){ 
                //如果已经选择过数据库则需要操作一次 
                @mysql_select_db($this->cur_db, $this->link_ro); 
            } 
        }else{ 
            //连接失败 
            //echo "link ro failed!<br>"; 
            $this->link = &$this->link_rw; 
        } 
    } 
 
    //设置一系列只读数据库并且连接其中一个 
    function set_ro_list($ro_list){ 
        if(is_array($ro_list)){ 
            //随机选择其中一个 
            $link_ro = $ro_list[array_rand($ro_list)]; 
            $this->connect_ro($link_ro['dbhost'], $link_ro['dbuser'], $link_ro['dbpw']); 
        } 
    } 
 
    function select_db($dbname) { 
        //同时操作两个数据库连接 
        $this->cur_db = $dbname; 
        if($this->ro_exist){ 
            @mysql_select_db($dbname, $this->link_ro); 
        } 
        return @mysql_select_db($dbname, $this->link_rw); 
    } 
 
    function fetch_array($query, $result_type = MYSQL_ASSOC) { 
        return mysql_fetch_array($query, $result_type); 
    } 
 
    function fetch_one_array($sql, $type = '') { 
        $qr = $this->query($sql, $type); 
        return $this->fetch_array($qr); 
    } 
 
    function query($sql, $type = '') { 
        $this->link = &$this->link_rw; 
        //判断是否select语句 
        if($this->ro_exist && preg_match ("/^(s*)select/i", $sql)){ 
            $this->link = &$this->link_ro; 
        } 
        $func = $type == 'UNBUFFERED' && @function_exists('mysql_unbuffered_query') ? 
            'mysql_unbuffered_query' : 'mysql_query'; 
        if(!($query = $func($sql, $this->link)) && $type != 'SILENT') { 
            $this->halt('MySQL Query Error', $sql); 
        } 
        $this->querynum++; 
        return $query; 
    } 
 
    function affected_rows() { 
        return mysql_affected_rows($this->link); 
    } 
 
    function error() { 
        return (($this->link) ? mysql_error($this->link) : mysql_error()); 
    } 
 
    function errno() { 
        return intval(($this->link) ? mysql_errno($this->link) : mysql_errno()); 
    } 
 
    function result($query, $row) { 
        $query = @mysql_result($query, $row); 
        return $query; 
    } 
 
    function num_rows($query) { 
        $query = mysql_num_rows($query); 
        return $query; 
    } 
 
    function num_fields($query) { 
        return mysql_num_fields($query); 
    } 
 
    function free_result($query) { 
        return mysql_free_result($query); 
    } 
 
    function insert_id() { 
        return ($id = mysql_insert_id($this->link)) >= 0 ? $id : $this->result($this->query("SELECT last_insert_id()"), 0); 
    } 
 
    function fetch_row($query) { 
        $query = mysql_fetch_row($query); 
        return $query; 
    } 
 
    function fetch_fields($query) { 
        return mysql_fetch_field($query); 
    } 
 
    function version() { 
        return mysql_get_server_info($this->link); 
    } 
 
    function close() { 
        return mysql_close($this->link); 
    } 
 
    function halt($message = '', $sql = '') { 
        $dberror = $this->error(); 
        $dberrno = $this->errno(); 
        echo "<div style="position:absolute;font-size:11px;font-family:verdana,arial;background:#EBEBEB;padding:0.5em;"> 
                <b>MySQL Error</b><br> 
                <b>Message</b>: $message<br> 
                <b>SQL</b>: $sql<br> 
                <b>Error</b>: $dberror<br> 
                <b>Errno.</b>: $dberrno<br> 
                </div>"; 
        exit(); 
    } 
}
?>

<?php 
/****************************************
*** mysql-rw-php version 0.1
*** http://www.jb200.com
*** http://code.google.com/p/mysql-rw-php/
*** code modify from class_mysql.php (uchome)
****************************************/ 
 
require_once('mysql_rw_php.class.php'); 
 
//rw info 
$db_rw = array( 
    'dbhost'=>'www.jb200.com', 
    'dbuser'=>'jbxue', 
    'dbpw'=>'www.jb200.com', 
    'dbname'=>'test' 
); 
 
$db_ro = array( 
    array( 
        'dbhost'=>'www.jb200.com:4306', 
        'dbuser'=>'jbxue', 
        'dbpw'=>'www.jb200.com' 
    ) 
); 
 
$DB = new mysql_rw_php; 
 
//connect Master 
$DB->connect($db_rw[dbhost], $db_rw[dbuser], $db_rw[dbpw], $db_rw[dbname]); 
 
//Method 1: connect one server 
$DB->connect_ro($db_ro[0][dbhost], $db_ro[0][dbuser], $db_ro[0][dbpw]); 
 
//Method 2: connect one server from a list by rand 
$DB->set_ro_list($db_ro); 
 
//send to rw 
$sql = "insert into a set a='test'"; 
$DB->query($sql); 
 
//send to ro 
$sql = "select * from a"; 
$qr = $DB->query($sql); 
while($row = $DB->fetch_array($qr)){ 
    echo $row[a]; 
} 
?>