JavaFX通过使用组合框选择填充TableView

Question

我想用名为ComboBoxSelectCustomer的组合框填充名为CustomerTableView的TableView。基本上，用户从ComboBox内部的客户列表中选择一个客户，并且TableView将填充与该客户名称匹配的数据。我在每个客户的SQL文件中有多个表，但由于某种原因，当我从组合框中选择一个客户名时，TableView上没有任何反应，它只是空着。代码没有错误或任何问题，我只是认为它的设置方式是导致问题的原因。请检阅我的代码，并告诉我我如何能以更好的方式设置这些方法后会有组合框触发一个SQL语句来填充的TableView

// MainController

/* 
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*/ 
package supremeinkcalcmk2; 

import java.net.URL; 
import java.sql.Connection; 
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; 
import javafx.scene.control.TableColumn; 
import javafx.scene.control.TableView; 
import javafx.scene.control.cell.PropertyValueFactory; 
import javax.swing.DefaultComboBoxModel; 

/** 
* FXML Controller class 
* 
*/ 
public class MainController implements Initializable { 

    @FXML 
    public ComboBox<String> ComboBoxSelectCustomer; 
    @FXML 
    private TableView CustomerTableView; 
    @FXML 
    private TableColumn<BaseColor, String> BaseColor; 
    @FXML 
    private TableColumn<BaseColor, String> Price; 
    Connection connection; 

    /** 
    * Initializes the controller class. 
    */ 
    @Override 
    public void initialize(URL url, ResourceBundle rb) { 
     // TODO 

     //Customer combo box 
     ComboBoxSelectCustomer.setOnAction(e -> System.out.println(ComboBoxSelectCustomer.getValue())); 
     buildDataComboBox(); 
     buildDataTableView(); 

    } 

    public void buildDataTableView() { 
     //viewtable db connect 
     ObservableList<BaseColor> dataCustomerViewTable = FXCollections.observableArrayList(); 
     BaseColor.setCellValueFactory(new PropertyValueFactory<BaseColor, String>("BaseColor")); 
     Price.setCellValueFactory(new PropertyValueFactory<BaseColor, String>("Price")); 
     connection = SqlConnection.CustomerConnection(); 
     try { 
//problem 
      String SQL = "Select BaseColor, Price FROM " + ComboBoxSelectCustomer.getValue(); 
      connection = SqlConnection.CustomerConnection(); 
      ResultSet rs = connection.createStatement().executeQuery(SQL); 
      while (rs.next()) { 
       BaseColor BS = new BaseColor(); 
       BS.BaseColor.set(rs.getString("BaseColor")); 
       BS.Price.set(rs.getString("Price")); 
       dataCustomerViewTable.add(BS); 
      } 
      CustomerTableView.setItems(dataCustomerViewTable); 
     } catch (Exception e) { 
     } 
    } 

    //combobox sql connection and fill data 
    public void buildDataComboBox() { 
     ObservableList<String> dataComboBox = FXCollections.observableArrayList(); 
     connection = SqlConnection.CustomerConnection(); 
     try { 
      String SQL = "Select Name From CustomerList"; 
      ResultSet rs = connection.createStatement().executeQuery(SQL); 
      while (rs.next()) { 
       dataComboBox.add(rs.getString("Name")); 
      } 
      ComboBoxSelectCustomer.setItems(dataComboBox); 
     } catch (Exception e) { 
      e.printStackTrace(); 
      System.out.println("Error Building ComboBox Data"); 
     } 
     if (connection == null) { 
      System.exit(1); 
      System.out.println("Connection failed"); 
     } 
    } 

    public boolean isDbConnected() { 
     try { 
      return connection.isClosed(); 
     } catch (SQLException e) { 
      e.printStackTrace(); 
      return false; 
     } 
    } 

} 

Answer 1

创建一个setOnAction事件上ComboBoxSelectionCustomer只要用户更改ComboBox上的选项，就允许TableView填充。

ComboBoxSelectCustomer.setOnAction((event) -> { 
});