@SuppressWarnings("resource")
	public void login() {
		while (true) {
			System.out.print("Enter username: ");
			String DB_USERNAME = new Scanner(System.in).nextLine();
			System.out.print("Enter password: ");
			String DB_PASSWORD = new Scanner(System.in).nextLine();
			ds = new DataSource(DB_URL, DB_USERNAME, DB_PASSWORD);
			if (ds.isConnected()) {
				return;
			} else {
				System.out.println("Invalid username or password.");
			}
		}
	}