如何使用Javafx应用程序更改MySql数据库中特定字段的值？

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class Main extends Application {

    private static final String DB_URL = "jdbc:mysql://localhost:3306/数据库名";
    private static final String DB_USER = "用户名";
    private static final String DB_PASSWORD = "密码";

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

    @Override
    public void start(Stage primaryStage) {
        TextField valueField = new TextField();
        Button updateButton = new Button("更新字段值");

        updateButton.setOnAction(event -> {
            String value = valueField.getText();

            try (Connection connection = DriverManager.getConnection(DB_URL, DB_USER, DB_PASSWORD);
                 PreparedStatement statement = connection.prepareStatement("UPDATE 表名 SET 字段名 = ? WHERE 条件")) {

                statement.setString(1, value);
                statement.executeUpdate();

                System.out.println("字段值已更新");
            } catch (SQLException e) {
                e.printStackTrace();
            }
        });

        VBox root = new VBox(10, valueField, updateButton);
        root.setPadding(new Insets(10));

        primaryStage.setScene(new Scene(root, 200, 100));
        primaryStage.setTitle("更新字段值");
        primaryStage.show();
    }
}