ThinkPHP/Lib/Driver/Db/DbMysql.class.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

defined('THINK_PATH') or exit();

/**
 * Mysql数据库驱动类
 * @category   Think
 * @package  Think
 * @subpackage  Driver.Db
 * @author    liu21st <liu21st@gmail.com>
 */
class DbMysql extends Db{

    /**
     * 架构函数 读取数据库配置信息
     * @access public
     * @param array $config 数据库配置数组
     */
    public function __construct($config=''){
        if ( !extension_loaded('mysql') ) {
            throw_exception(L('_NOT_SUPPERT_').':mysql');
        }
        if(!empty($config)) {
            $this->config   =   $config;
            if(empty($this->config['params'])) {
                $this->config['params'] =   '';
            }
        }
    }

    /**
     * 连接数据库方法
     * @access public
     * @throws ThinkExecption
     */
    public function connect($config='',$linkNum=0,$force=false) {
        if ( !isset($this->linkID[$linkNum]) ) {
            if(empty($config))  $config =   $this->config;
            // 处理不带端口号的socket连接情况
            $host = $config['hostname'].($config['hostport']?":{$config['hostport']}":'');
            // 是否长连接
            $pconnect   = !empty($config['params']['persist'])? $config['params']['persist']:$this->pconnect;
            if($pconnect) {
                $this->linkID[$linkNum] = mysql_pconnect( $host, $config['username'], $config['password'],131072);
            }else{
                $this->linkID[$linkNum] = mysql_connect( $host, $config['username'], $config['password'],true,131072);
            }
            if ( !$this->linkID[$linkNum] || (!empty($config['database']) && !mysql_select_db($config['database'], $this->linkID[$linkNum])) ) {
                throw_exception(mysql_error());
            }
            $dbVersion = mysql_get_server_info($this->linkID[$linkNum]);