SQLSTATE[HY000] [1129] Host '030039.com' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'

        try {
            if (empty($config['dsn'])) {
                $config['dsn'] = $this->parseDsn($config);
            }

            if ($config['debug']) {
                $startTime = microtime(true);
            }

            $this->links[$linkNum] = new PDO($config['dsn'], $config['username'], $config['password'], $params);

            if ($config['debug']) {
                // 记录数据库连接信息
                $this->log('[ DB ] CONNECT:[ UseTime:' . number_format(microtime(true) - $startTime, 6) . 's ] ' . $config['dsn']);
            }

            return $this->links[$linkNum];
        } catch (\PDOException $e) {
            if ($autoConnection) {