if (checkDriver("com.mysql.jdbc.Driver"))
            System.out.println(" ... OK");
        else
            System.exit(1);
        Connection con = getConnection("jdbc:mysql://", "localhost", 3306, "root", "");
        Statement st = createStatement(con);

        // próba wybrania bazy
        if (executeUpdate(st, "USE lab_java;") == 0)
            System.out.println("Baza wybrana");
        else
            System.out.println("Baza nie istnieje!");
        String sql = "SELECT * FROM questions";
        ResultSet result = executeQuery(st,sql);