设置ecshop数据库服务器分离，让读与写分开 ，可大大加快网站速度。也可更好的优化网站。

data/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;//www.zuimoban.com

$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 = '<' . "?phprn" .

'$this->mysql_config_cache_file_time = ' . $this->starttime . ";rn" .

'$this->timeline = ' . $this->timeline . ";rn" .

'$this->timezone = ' . $this->timezone . ";rn" .

'$this->platform = ' . "'" . $this->platform . "';rn?" . '>';

@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);

}

}