public function __construct($username, $password)
 {
     parent::__construct($username);
     $this->password = $password;
     $selector = new DBSelect('localhost', 'root', '', 'mydb');
     $result = $selector->hasUserUsername($this->getUsername());
     if ($result) {
         $password = $selector->selectUserPassword($this->getUsername());
         if ($this->password == $password) {
             $this->loggedIn = true;
         } else {
             echo 'password';
         }
     } else {
         echo 'username';
     }
 }