public enum DataBaseConnectInfo {
    ELEPHANTSQL("Jdbc:postgresql://elmer-02.db.elephantsql.com:5432/qeatlkks","qeatlkks","G9VQSjfGX-RT3iRkUdMEAawYCZJJrCKy");
    public final String URL;
    public final String USER;
    public final String PASSWORD;
    private DataBaseConnectInfo(String url, String user, String pass){
        URL=url;
        USER=user;
        PASSWORD=pass;
    }
}




    public void connect() {
        if (connection != null) {
            return;
        }
        try {
            Class.forName("org.postgresql.Driver");
            connection = DriverManager.getConnection(DataBaseConnectInfo.ELEPHANTSQL.URL, DataBaseConnectInfo.ELEPHANTSQL.USER, DataBaseConnectInfo.ELEPHANTSQL.PASSWORD);
        } catch (ClassNotFoundException | SQLException e) {
            System.out.println("Problem z połączeniem z bazą danych!");
        }
    }