private void doSelectTest() {
        System.out.println("[OUTPUT FROM SELECT]");
        String query = "SELECT COF_NAME, PRICE FROM COFFEES";
        try {
            Statement st = conn.createStatement();
            ResultSet rs = st.executeQuery(query);
            while (rs.next()) {
                String s = rs.getString("COF_NAME");
                float n = rs.getFloat("PRICE");
                System.out.println(s + "   " + n);
            }
        } catch (SQLException ex) {
            System.err.println(ex.getMessage());
        }
    }