db_mysqli::connect PHP Method

    public function connect($config = '', $linkNum = 0)
    {
        if (!isset($this->linkID[$linkNum])) {
            if (empty($config)) {
                $config = $this->config;
            }
            $this->linkID[$linkNum] = new mysqli($config['hostname'], $config['username'], $config['password'], $config['database'], $config['hostport'] ? intval($config['hostport']) : 3306);
            if (mysqli_connect_errno()) {
                throw new Exception(mysqli_connect_error());
            }
            $dbVersion = $this->linkID[$linkNum]->server_version;
            // 设置数据库编码
            $this->linkID[$linkNum]->query("SET NAMES '" . $config['charset'] . "'");
            //设置 sql_model
            if ($dbVersion > '5.0.1') {
                $this->linkID[$linkNum]->query("SET sql_mode=''");
            }
        }
        return $this->linkID[$linkNum];
    }

        }
    }
    public function getOneRow($sql)
    {
        $res = $this->query($sql);
        if ($res !== false) {
            return mysqli_fetch_assoc($res);
        } else {
            return false;
        }
    }
    public function getRowsNum($sql)
    {
        $query = $this->query($sql);
        return mysqli_num_rows($query);
    }
    private function ErrorMsg($value = '')
    {
        if ($value) {
            echo $value;
        } else {
            echo @mysqli_error();
        }
        exit;
    }
}
$db = new db_mysqli();
$db->connect(DB_HOST, DB_USER, DB_PWD, DB_NAME);
if (function_exists('date_default_timezone_set')) {
    date_default_timezone_set('PRC');
}