93 lines
2.5 KiB
PHP
93 lines
2.5 KiB
PHP
<?php
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/**
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* [Discuz!] (C)2001-2099 Comsenz Inc.
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* This is NOT a freeware, use is subject to license terms
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*
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* $Id: db_driver_mysql_slave.php 31879 2012-10-18 09:27:24Z zhangguosheng $
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*/
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if(!defined('IN_DISCUZ')) {
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exit('Access Denied');
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}
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class db_driver_mysql_slave extends db_driver_mysql
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{
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public $slaveid = null;
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public $slavequery = 0;
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public $slaveexcept = false;
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public $excepttables = array();
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public $tablename = '';
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protected $_weighttable = array();
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public $serverid = null;
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function set_config($config) {
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parent::set_config($config);
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if($this->config['common']['slave_except_table']) {
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$this->excepttables = explode(',', str_replace(' ', '', $this->config['common']['slave_except_table']));
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}
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}
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public function table_name($tablename) {
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$this->tablename = $tablename;
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if(!$this->slaveexcept && $this->excepttables) {
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$this->slaveexcept = in_array($tablename, $this->excepttables, true);
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}
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$this->serverid = isset($this->map[$this->tablename]) ? $this->map[$this->tablename] : 1;
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return $this->tablepre.$tablename;
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}
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protected function _slave_connect() {
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if(!empty($this->config[$this->serverid]['slave'])) {
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$this->_choose_slave();
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if($this->slaveid) {
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if(!isset($this->link[$this->slaveid])) {
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$this->connect($this->slaveid);
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}
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$this->slavequery ++;
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$this->curlink = $this->link[$this->slaveid];
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}
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return true;
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} else {
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return false;
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}
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}
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protected function _choose_slave(){
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if(!isset($this->_weighttable[$this->serverid])) {
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foreach ($this->config[$this->serverid]['slave'] as $key => $value) {
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$this->_weighttable[$this->serverid] .= str_repeat($key, 1 + intval($value['weight']));
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}
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}
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$sid = $this->_weighttable[$this->serverid][mt_rand(0, strlen($this->_weighttable[$this->serverid]) -1)];
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$this->slaveid = $this->serverid.'_'.$sid;
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if(!isset($this->config[$this->slaveid])) {
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$this->config[$this->slaveid] = $this->config[$this->serverid]['slave'][$sid];
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}
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}
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protected function _master_connect() {
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if(!$this->link[$this->serverid]) {
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$this->connect($this->serverid);
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}
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$this->curlink = $this->link[$this->serverid];
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}
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public function query($sql, $silent = false, $unbuffered = false) {
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if(!(!$this->slaveexcept && strtoupper(substr($sql, 0 , 6)) === 'SELECT' && $this->_slave_connect())) {
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$this->_master_connect();
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}
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$this->tablename = '';
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$this->slaveexcept = false;
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return parent::query($sql, $silent, $unbuffered);
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}
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}
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?>
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