ecshop改造读写分离

前两天配置好了mysql主从方式，今天就拿ecshop练习读写分离。以下代码仅供学习参考，不成熟的地方，还需完善。

config.php

<?php

$db_name   = "ecshop";

$prefix    = "ecs_";

$timezone    = "Europe/Berlin";

$cookie_path    = "/";

$cookie_domain    = "";

$session = "1440";

$_config = array();

//数据库主服务器设置, 支持多组服务器设置, 当设置多组服务器时, 则会随机使用某个服务器
$_config['master'][1]['dbhost'] = "192.168.2.175:3306";
$_config['master'][1]['dbname'] = "ecshop";
$_config['master'][1]['dbuser'] = "dragon";
$_config['master'][1]['dbpw'] = "loong";

/*
 *$_config['master'][2]['dbhost'] = "";
 *...
 */

//数据库从服务器设置( slave, 只读 ), 支持多组服务器设置, 当设置多组服务器时, 系统每次随机使用
$_config['slave'][1]['dbhost'] = "192.168.2.176:3306";
$_config['slave'][1]['dbname'] = "ecshop";
$_config['slave'][1]['dbuser'] = "ivan";
$_config['slave'][1]['dbpw'] = "loong";

$_config['slave'][2]['dbhost'] = "192.168.2.177:3306";
$_config['slave'][2]['dbname'] = "ecshop";
$_config['slave'][2]['dbuser'] = "ivan";
$_config['slave'][2]['dbpw'] = "loong";

define('EC_CHARSET','utf-8');

define('ADMIN_PATH','admin');

define('AUTH_KEY', 'this is a key');

define('OLD_AUTH_KEY', '');

define('API_TIME', '');

?>

初始化数据连接类

    /* 初始化数据库类
     * 如果配置了从服务器，则初始化从库类
    */
    if(count($_config['slave'])) {
        require(ROOT_PATH . 'includes/cls_mysql_slave.php');
        $db = new cls_mysql_slave($_config);
    }else{
        require(ROOT_PATH . 'includes/cls_mysql.php');
        $db = new cls_mysql($_config);
    }  

增加cls_mysql_slave.php从库类

<?php

require(ROOT_PATH . 'includes/cls_mysql.php');
class cls_mysql_slave extends cls_mysql
{
    var $slaveid = null;

    function set_config($config){
        if(!empty($this->config['slave'])) {
            $this->slaveid = array_rand($this->config['slave']);
        }
        parent::set_config($config);
    }

    /* 随机分配从库连接 */
    function set_slave_config() {
        $this->settings = $this->config['slave'][$this->slaveid];
        $this->settings['charset'] = $this->config['charset'];
        $this->settings['pconnect'] = $this->config['pconnect'];
    }

    function slave_connect() {
        $this->set_slave_config();
        $dbhost = $this->settings['dbhost'];
        $dbuser = $this->settings['dbuser'];
        $dbpw = $this->settings['dbpw'];
        $dbname = $this->settings['dbname'];
        $this->connect($dbhost, $dbuser, $dbpw, $dbname);

    }

    function query($sql, $type = '') {
        // 如果执行查询操作，则执行从库连接
        if($this->slaveid && strtoupper(substr($sql, 0 , 6)) == 'SELECT') {
            $this->slave_connect();
        }else{
            parent::set_config($this->config);
            $dbhost = $this->settings['dbhost'];
            $dbuser = $this->settings['dbuser'];
            $dbpw = $this->settings['dbpw'];
            $dbname = $this->settings['dbname'];
            $this->connect($dbhost, $dbuser, $dbpw, $dbname);
        }
        return parent::query($sql, $type);
    }

    /* 删除失败连接*/
    function del_error_link(){
        unset($this->config['slave'][$this->slaveid]);
        $this->set_config($this->config);
        $this->set_slave_config();
        $dbhost = $this->settings['dbhost'];
        $dbuser = $this->settings['dbuser'];
        $dbpw = $this->settings['dbpw'];
        $dbname = $this->settings['dbname'];
        $this->connect($dbhost, $dbuser, $dbpw, $dbname);
    }

}

cls_mysql.php文件类修改

<?php

if (!defined('IN_ECS'))
{
    die('Hacking attempt');
}

class cls_mysql
{
    var $link_id    = NULL;

    var $settings   = array();

    var $queryCount = 0;
    var $linkCount = 0;
    var $queryTime  = '';
    var $queryLog   = array();

    var $max_cache_time = 300; // 最大的缓存时间，以秒为单位

    var $cache_data_dir = 'temp/query_caches/';
    var $root_path      = '';

    var $error_message  = array();
    var $platform       = '';
    var $version        = '';
    var $dbhash         = '';
    var $starttime      = 0;
    var $timeline       = 0;
    var $timezone       = 0;

    var $mysql_config_cache_file_time = 0;

    var $mysql_disable_cache_tables = array(); // 不允许被缓存的表，遇到将不会进行缓存
    var $config = array();

    function __construct($config, $charset = 'utf8', $pconnect = 0, $quiet = 0)
    {
        $this->cls_mysql($config, $charset, $pconnect, $quiet);
    }

    function cls_mysql($config, $charset = 'utf8', $pconnect = 0, $quiet = 0)
    {
        if(!empty($config)) {
            $config['charset'] = $charset;
            $config['pconnect'] = $pconnect;
            $this->config = $config;
        }

        if (defined('EC_CHARSET'))
        {
            $charset = strtolower(str_replace('-', '', EC_CHARSET));
        }

        if (defined('ROOT_PATH') && !$this->root_path)
        {
            $this->root_path = ROOT_PATH;
        }

        $this->set_config($this->config);

        if ($quiet)
        {
            $dbhost = $this->settings['dbhost'];
            $dbuser = $this->settings['dbuser'];
            $dbpw = $this->settings['dbpw'];
            $dbname = $this->settings['dbname'];
            $this->connect($dbhost, $dbuser, $dbpw, $dbname, $charset, $pconnect, $quiet);
        }
    }

    //随机分配数据库连接
    function set_config($config) {
        $sid = array_rand($config['master']);
        $settings = $config['master'][$sid];
        $settings['sid'] = $sid;
        $settings['charset'] = $this->config['charset'];
        $settings['pconnect'] = $this->config['pconnect'];
        $this->settings = $settings;
    }

    function connect($dbhost, $dbuser, $dbpw, $dbname = '', $charset = 'utf8', $pconnect = 0, $quiet = 0)
    {
        if ($pconnect)
        {
            if (!($this->link_id = @mysql_pconnect($dbhost, $dbuser, $dbpw)))
            {
                if (!$quiet)
                {
                    $this->ErrorMsg("Can't pConnect MySQL Server!");
                }

                return false;
            }
        }
        else
        {
            if (PHP_VERSION >= '4.2')
            {
                $this->link_id = @mysql_connect($dbhost, $dbuser, $dbpw, true);
            }
            else
            {
                $this->link_id = @mysql_connect($dbhost, $dbuser, $dbpw);

                mt_srand((double)microtime() * 1000000); // 对 PHP 4.2 以下的版本进行随机数函数的初始化工作
            }
            if (!$this->link_id)
            {
                if (!$quiet)
                {
                    //连接超过10次，中断连接，抛出错误
                    if($this->linkCount>9){
                        $this->ErrorMsg("Can't Connect MySQL Server!");
                    }
                    $this->linkCount++;
                    $this->del_error_link();
                }

                return false;
            }
        }

        $this->dbhash  = md5($this->root_path . $dbhost . $dbuser . $dbpw . $dbname);
        $this->version = mysql_get_server_info($this->link_id);

        /* 如果mysql 版本是 4.1+ 以上，需要对字符集进行初始化 */
        if ($this->version > '4.1')
        {
            if ($charset != 'latin1')
            {
                mysql_query("SET character_set_connection=$charset, character_set_results=$charset, character_set_client=binary", $this->link_id);
            }
            if ($this->version > '5.0.1')
            {
                mysql_query("SET sql_mode=''", $this->link_id);
            }
        }

        $sqlcache_config_file = $this->root_path . $this->cache_data_dir . 'sqlcache_config_file_' . $this->dbhash . '.php';

        @include($sqlcache_config_file);

        $this->starttime = time();

        if ($this->max_cache_time && $this->starttime > $this->mysql_config_cache_file_time + $this->max_cache_time)
        {
            if ($dbhost != '.')
            {
                $result = mysql_query("SHOW VARIABLES LIKE 'basedir'", $this->link_id);
                $row    = mysql_fetch_assoc($result);
                if (!empty($row['Value']{1}) && $row['Value']{1} == ':' && !empty($row['Value']{2}) && $row['Value']{2} == "\\")
                {
                    $this->platform = 'WINDOWS';
                }
                else
                {
                    $this->platform = 'OTHER';
                }
            }
            else
            {
                $this->platform = 'WINDOWS';
            }

            if ($this->platform == 'OTHER' &&
                ($dbhost != '.' && strtolower($dbhost) != 'localhost:3306' && $dbhost != '127.0.0.1:3306') ||
                (PHP_VERSION >= '5.1' && date_default_timezone_get() == 'UTC'))
            {
                $result = mysql_query("SELECT UNIX_TIMESTAMP() AS timeline, UNIX_TIMESTAMP('" . date('Y-m-d H:i:s', $this->starttime) . "') AS timezone", $this->link_id);
                $row    = mysql_fetch_assoc($result);

                if ($dbhost != '.' && strtolower($dbhost) != 'localhost:3306' && $dbhost != '127.0.0.1:3306')
                {
                    $this->timeline = $this->starttime - $row['timeline'];
                }

                if (PHP_VERSION >= '5.1' && date_default_timezone_get() == 'UTC')
                {
                    $this->timezone = $this->starttime - $row['timezone'];
                }
            }

            $content = '<' . "?php\r\n" .
                       '$this->mysql_config_cache_file_time = ' . $this->starttime . ";\r\n" .
                       '$this->timeline = ' . $this->timeline . ";\r\n" .
                       '$this->timezone = ' . $this->timezone . ";\r\n" .
                       '$this->platform = ' . "'" . $this->platform . "';\r\n?" . '>';

            @file_put_contents($sqlcache_config_file, $content);
        }

        /* 选择数据库 */
        if ($dbname)
        {
            if (mysql_select_db($dbname, $this->link_id) === false )
            {
                if (!$quiet)
                {
                    $this->ErrorMsg("Can't select MySQL database!");
                }

                return false;
            }
            else
            {
                return true;
            }
        }
        else
        {
            return true;
        }
    }

    ......

    /* 删除失败连接*/
    function del_error_link(){
        unset($this->config['master'][$this->settings['sid']]);
        $this->set_config($this->config);
        $dbhost = $this->settings['dbhost'];
        $dbuser = $this->settings['dbuser'];
        $dbpw = $this->settings['dbpw'];
        $dbname = $this->settings['dbname'];
        $this->connect($dbhost, $dbuser, $dbpw, $dbname);
    }
}

转载：http://blog.csdn.net/very_loong/article/details/7999895