Question

我对javafx和jdbc都是陌生的。我正在一个需要构建从头开始的项目（我选择了javafx）来显示数据和检索数据。以上是我的尝试，但没有成功。在我输入任何jdbc代码之前，它可以完美地工作。请帮忙

如何从MySQL检索数据并使用javafx显示数据在这种情况下，如何进行计算结束日期-开始结束以获取持续时间如何处理不同的类型，例如在javafx的Text Object中显示int

假设所有需求导入均已导入，并假设在没有jdbc代码的情况下它可以完美工作

错误消息太长了，所以我只在这里列出一些应用程序启动方法异常由以下原因引起：java.sql.SQLException：结果集开始之前

public class C32 extends Application {
    String stm = "select * from e_vent where sitename = 'Atlanta BeltLine Center'";
    String stm2 = "select datediff(end_date, start_date) as duratoin from e_vent";
    @Override
    public void start(Stage SED) throws Exception {

        GridPane gp = new GridPane();
        gp.setAlignment(Pos.CENTER);
        Text event = new Text("Event: ");
        gp.add(event, 0, 1);
        Text eventT = new Text(getResult(stm).getString("event_name"));
        gp.add(eventT, 1, 1);
        Text site = new Text("Site: ");
        gp.add(site, 4, 1);
        Text siteT = new Text(getResult(stm).getString("sitename"));
        gp.add(siteT, 5, 1);
        Text startD = new Text("Start Date: ");
        gp.add(startD, 0, 2);
        Date date = getResult(stm).getDate("start_date");
        Text startDT = new Text(date.toString());
        gp.add(startDT, 1, 2);
        Text endD = new Text("End Date: ");
        gp.add(endD, 2, 2);
        Date date2 = getResult(stm).getDate("end_date");
        Text endDT = new Text(date2.toString());
        gp.add(endDT, 3, 2);
        Text durationD = new Text("Duration Day: ");
        gp.add(durationD, 4, 2);
        Integer test = getResult(stm2).getInt("duration");
        Text durationDT = new Text(test.toString());
        gp.add(durationDT, 5, 2);
        Text staffA = new Text("Staff Assigned: ");
        gp.add(staffA, 0, 3);
        Text staffAT = new Text("_");
        gp.add(staffAT, 1, 3);
        Text capacity = new Text("Capacity: ");
        gp.add(capacity, 2, 3);
        Integer c1 = getResult(stm).getInt("capacity");
        Text capacityT = new Text(c1.toString());
        gp.add(capacityT, 3, 3);
        Text price = new Text("Price: ");
        gp.add(price, 4, 3);
        Double p1 = getResult(stm).getDouble("event_price");
        Text priceT = new Text(p1.toString());
        gp.add(priceT, 5, 3);
        Text description = new Text("Description: ");
        gp.add(description, 0, 4);
        Text descriptionT = new Text(getResult(stm).getString("descript"));
        gp.add(descriptionT, 1, 4);
        bp.getChildren().add(gp);
    }

    public static void main(String args[]) {
        launch(args);
    }

    public static ResultSet getResult(String a) {
        ResultSet rs = null;
        try {
            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/atlanta_beltlinetest?"
                    + "allowPublicKeyRetrieval=true&useSSL=false&serverTimezone=UTC", "root", "Destiny123");
            Statement stmt = con.createStatement();
            String sql = a;
            rs = stmt.executeQuery(sql);
            System.out.println("all good");
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return rs;
    }

}

从mysql获取数据并在javafx中显示它们

0 个答案: