src/Leevel/Database/Connect.php
protected function writeConnect(): PDO
    {
        return $this->connect = $this->commonConnect($this->option['master'], IConnect::MASTER, true);
    }
protected function writeConnect(): PDO
    {
        return $this->connect = $this->commonConnect($this->option['master'], IConnect::MASTER, true);
    }
连接主服务器.

@return \PDO