组合框选择和模型绑定

Question

问题概述：

我有两个型号OrderModel和OrderStatusModel。将OrderStatusModel项放入组合框中，该组合框包含用户更新Order表中名为orderStatusId的外键字段的选项。当我初始化数据时，我希望能够从OrderModel中取出并检索当前的orderStatusId，然后设置组合框（包含所有用户选择）以匹配位于orderStatusId（其中包含位于OrderModel中的FK）的Order表）。组合框需要能够在进行新选择时更新OrderModel。从数据库获取数据以填充OrderModel时，我拉出我的FK orderStatusId。从这一点开始，我使用case语句在OrderStatusModel中选择适当的项目，并在初始化时选择选项。我知道这不是最好的方法，因为如果我要在后端数据库中为新类型的状态添加一个新行（例如：取消订单），那么我需要更新所有我的switch语句以允许那种变化。

示例代码

Controller

package test.pkg2;

import java.awt.Label;
import java.beans.Statement;
import java.net.URL;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ResourceBundle;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ComboBox;

public class Test2Controller implements Initializable{

    @FXML
    private Label customerName;

    @FXML
    private Label orderNumber;

    @FXML
    private Label orderStatusId;

    @FXML
    private ComboBox<OrderStatusModel> orderStatusCmb;

    private ObservableList<OrderStatusModel> orderStatusModel;
    private ObservableList<OrderModel> orderModel;

    int statusId;

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        this.orderStatusCmb.getSelectionModel().selectedItemProperty().addListener((obs, newValue, oldValue) ->{
            if(newValue != null && newValue != oldValue){
                this.orderStatusCmb.getSelectionModel().getSelectedItem().getOrderStatusId();
                //TODO UPDATE Order table with new orderStatusId from above code ^^^^^^
            }
        });
        populateOrderStatusCombobox();
        getCurrentOrder();
    }

    private void populateOrderStatusCombobox(){
        String SQL = "SELECT Status.statusId, Status.statusName 
" 
                     +"FROM Status;";

        orderStatusModel = FXCollections.observableArrayList();

        //Status table:
        // +-----------+-------------+------+-----+---------+
        // | Field     | Type        | Null | Key | Default |
        // +-----------+-------------+------+-----+---------+
        // | statusId  | int         | YES  | PK  | NULL    |       
        // | statusName| varchar(20) | YES  |     | NULL    |       
        // +-----------+-------------+------+-----+---------+

        //example data: statusId = 1 statusName = Order Taken
        //example data: statusId = 2 statusName = Order Processing
        //example data: statusId = 3 statusName = Shipped

        //Above items are populated into the combobox for selection
        try(Connection connection = DBConnection.getConnection()){
            PreparedStatement statement = connection.prepareStatement(SQL);
            ResultSet resultSet = statement.executeQuery();
            while(resultSet.next()){
                this.orderStatusModel.add(new OrderStatusModel(resultSet.getInt("statusId"),
                                                    resultSet.getString("statusName")));
            }
        } catch(SQLException e){

        }
        this.orderStatusCmb.setItems(orderStatusModel);
    }
    private void getCurrentOrder(){
        String SQL = "SELECT Order.orderNumber, Order.customerName, Order.orderStatusId 
"
                    +"FROM Order"
                    +"WHERE orderNumber = 123;";
        orderModel = FXCollections.observableArrayList();

        //Order table:
        // +--------------+-------------+------+-----+---------+
        // | Field        | Type        | Null | Key | Default |
        // +--------------+-------------+------+-----+---------+
        // | orderNumber  | int         | YES  | PK  | NULL    |       
        // | customerName | varchar(20) | YES  |     | NULL    |       
        // | orderStatusId| int         | YES  | FK  | NULL    |  
        // +--------------+-------------+------+-----+---------+

        //example data: orderNumber = 123
        //              customerName = SomeCompany
        //              orderStatusId = 1

        //I usually set the combobox here using the below method:
        try(Connection connection = DBConnection.getConnection()){
            PreparedStatement statement = connection.prepareStatement(SQL);
            ResultSet resultSet = statement.executeQuery();
            while(resultSet.next()){
                this.orderModel.add(new OrderModel(resultSet.getInt("orderNumber"),
                                                    resultSet.getString("customerName"),
                                                    resultSet.getInt("orderStatusId")));
                                                    statusId = resultSet.getInt("orderStatusId");
            }

            //HERE is where I initially set the orderStatus to match the orderModel
            //I am guessing I need some kind of binding here?
           switch(statusId){
               case 1: this.orderStatusCmb.getSelectionModel().select(0);
               break;
               case 2: this.orderStatusCmb.getSelectionModel().select(1);
               break;
               case 3: this.orderStatusCmb.getSelectionModel().select(3);
               break;
           }
        } catch(SQLException e){

        }
    }
}

OrderStatusModel

import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;


public class OrderStatusModel {
    private final IntegerProperty orderStatusId;
    private final StringProperty orderStatusName;

    public OrderStatusModel(int orderStatusId, String orderStatusName){
        this.orderStatusId = new SimpleIntegerProperty(orderStatusId);
        this.orderStatusName = new SimpleStringProperty(orderStatusName);
    }

    public IntegerProperty getOrderStatusId() {
        return orderStatusId;
    }

    public StringProperty getOrderStatusName() {
        return orderStatusName;
    }
}

OrderModel

package test.pkg2;

import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

public class OrderModel {

    private final IntegerProperty orderNumber;
    private final StringProperty customerName;
    private final IntegerProperty orderStatusId;

    public OrderModel(int orderNumber, String customerName, int orderStatusId){
        this.orderNumber = new SimpleIntegerProperty(orderNumber);
        this.customerName = new SimpleStringProperty(customerName);
        this.orderStatusId = new SimpleIntegerProperty(orderStatusId);
    }

    public IntegerProperty getOrderNumber() {
        return orderNumber;
    }

    public StringProperty getCustomerName() {
        return customerName;
    }

    public IntegerProperty getOrderStatusId() {
        return orderStatusId;
    }
}