Java 从DB获取数据时，新项在TreeTableView中未从更新？

javafx还处于学习阶段，我正在尝试更新数据库中的数据，但是当调用 getConnection方法列表已更新，但视图中的Treeitem未更新

在第一个屏幕上，它显示可用的数据库，但在创建新数据库后，即使在调用getConnection（）之后，树表视图也不会更新

在需要解决方案的地方标记“/--------------调用此处进行更新”

尝试

1.使用刷新（）

2.试图澄清观点

PaneClass.java

public class PanesClass extends Application {
    ObservableList<Connections> cList = FXCollections.observableArrayList();
    DbConnection                dbConnection      = new DbConnection();
    TreeItem                    rootItem          = new TreeItem();
    TreeTableView               activeConnections = new TreeTableView();
    AnchorPane                  firstPane         = new AnchorPane();
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        NewConnection               newConnection     = new NewConnection();
        SplitPane                   root              = new SplitPane();
        AnchorPane                  secondPane        = new AnchorPane();
        HBox                        buttonBox         = new HBox();
        BorderPane                  topBar            = new BorderPane();
        Button                      nConnection       = new Button("+");
        buttonBox.getChildren().addAll(nConnection);
        topBar.setTop(buttonBox);

        TreeTableColumn<String, Connections> cNameColoumn = new TreeTableColumn<>("Name");

        cNameColoumn.setCellValueFactory(new TreeItemPropertyValueFactory<>("name"));

        TreeTableColumn<String, Connections> cStatusColoumn = new TreeTableColumn<>("Status");

        cStatusColoumn.setCellValueFactory(new TreeItemPropertyValueFactory<>("status"));

        activeConnections.getColumns().addAll(cNameColoumn, cStatusColoumn);
        activeConnections.setLayoutX(20);
        activeConnections.setLayoutY(40);

        firstPane.getChildren().addAll(topBar, activeConnections);
        root.getItems().addAll(firstPane, secondPane);

        Scene sc = new Scene(root, 600, 480);

        primaryStage.setScene(sc);
        primaryStage.show();
        activeConnections.setShowRoot(false);

         getconnection();

        nConnection.setOnAction(new EventHandler<ActionEvent>() {
                                    @Override
                                    public void handle(ActionEvent event) {
                                        try {
                                            newConnection.getConnection(activeConnections);
                                        } catch (ClassNotFoundException | SQLException e) {
                                            e.printStackTrace();
                                        }
                                    }
                                });
    }

    void getconnection() throws ClassNotFoundException, SQLException {
    rootItem.getChildren().clear();
    cList.clear();
    cList = dbConnection.getDatabase();
        for (Connections temp : cList) {
            rootItem.getChildren().add(new TreeItem<Connections>(temp));
            System.out.println(temp);
        }
        activeConnections.setRoot(rootItem);
        activeConnections.refresh();

    }
}

---

不管你做什么-不要使用刷新（如果没有其他帮助的话，这是紧急api）。相反，设置您的数据，使视图的自动通知起作用-懒得费力阅读这一大堆代码，请将其剥离到一个只有最少量代码仍然存在问题的位置（不需要db连接，只需模拟它，不需要花哨的视觉效果/布局，除了更新的触发器之外，不需要任何交互……尽可能简单！：）谢谢@kleopatra检查了你的个人资料，这样我就可以联系你了！很好，你一直在尝试：）但这还远远不够（f.i.当您现在只想演示如何保存时，为什么要使用3个按钮？为什么要使用嵌套布局？一个简单的vbox和treeTableView/输入字段/安全按钮就足够了）。事实上，我认为您自己很困惑：您似乎有两个PanesClass实例—一个用作调用NewConnection的应用程序，另一个实例化（不要！）最后，这是一个与您前面的问题非常相似的错误：您不理解参数传递。重复：现在就做一个关于java的基本教程！

public class NewConnection {
    Connections                 connection = null;
    ObservableList<Connections> cList      = FXCollections.observableArrayList();
    PanesClass                  panesClass = new PanesClass();
    TreeItem<Connections>                    cItem      = null;
    TreeItem rootItem = new TreeItem();

    public void getConnection(TreeTableView<Connections> activeConnections) throws ClassNotFoundException, SQLException {
    DbConnection dbConnection=new DbConnection();
        Stage    secondaryStage = new Stage();
        VBox     root           = new VBox();
        GridPane cDetails       = new GridPane();
        HBox     actionButtons  = new HBox();
        Button   connect        = new Button("Connect");
        Button   save           = new Button("Save");
        Button   cancel         = new Button("Cancel");

        actionButtons.getChildren().addAll(connect, save, cancel);
        //cList=dbConnection.getDatabase();
        actionButtons.setSpacing(10);

        Label name = new Label("Username : ");

        cDetails.add(name, 0, 0);

        TextField uName = new TextField();

        cDetails.setHgrow(uName, Priority.ALWAYS);
        cDetails.add(uName, 1, 0);
        cDetails.setVgap(10);

        root.getChildren().addAll(cDetails, actionButtons);

        Scene sc = new Scene(root, 500, 200);
        secondaryStage.setScene(sc);
        secondaryStage.initModality(Modality.APPLICATION_MODAL);

        secondaryStage.show();
        save.setOnAction(new EventHandler<ActionEvent>() {
                             @Override
                             public void handle(ActionEvent event) {
                             try {

                    dbConnection.setNewDatabase(uName.getText());

   panesClass.getconnection();//-----------------*Calling Here for Updation*

         } catch (ClassNotFoundException | SQLException e) {
                    e.printStackTrace();
                }

                 secondaryStage.close();
                 event.consume();
         }              
      });
    }
}

public class Connections {
   private String name;
   private String password;
   private String url;
public Connections() {
    super();
}
public Connections(String name, String password, String url) {
    super();
    this.name = name;
    this.password = password;
    this.url = url;
}

public Connections(String name) {
    super();
    this.name = name;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getPassword() {
    return password;
}
public void setPassword(String password) {
    this.password = password;
}
public String getUrl() {
    return url;
}
public void setUrl(String url) {
    this.url = url;
}
@Override
public String toString() {
    return "Connections [name=" + name + ", password=" + password + ", url=" + url + "]";
}  
}