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46         if ( !isset($this->linkID[$linkNum]) ) {
47             if(empty($config))  $config =   $this->config;
48             // 处理不带端口号的socket连接情况
49             $host = $config['hostname'].($config['hostport']?":{$config['hostport']}":'');
50             // 是否长连接
51             $pconnect   = !empty($config['params']['persist'])? $config['params']['persist']:$this->pconnect;
52             if($pconnect) {
53                 $this->linkID[$linkNum] = mysql_pconnect( $host, $config['username'], $config['password'],131072);
54             }else{
55                 $this->linkID[$linkNum] = mysql_connect( $host, $config['username'], $config['password'],true,131072);
56             }
57             if ( !$this->linkID[$linkNum] || (!empty($config['database']) && !mysql_select_db($config['database'], $this->linkID[$linkNum])) ) {
58                 throw_exception(mysql_error());
59             }
60             $dbVersion = mysql_get_server_info($this->linkID[$linkNum]);
61             //使用UTF8存取数据库
62             mysql_query("SET NAMES '".C('DB_CHARSET')."'", $this->linkID[$linkNum]);
63             //设置 sql_model
64             if($dbVersion >'5.0.1'){
65                 mysql_query("SET sql_mode=''",$this->linkID[$linkNum]);
66             }
67             // 标记连接成功
68             $this->connected    =   true;
69             // 注销数据库连接配置信息
70             if(1 != C('DB_DEPLOY_TYPE')) unset($this->config);