JavaFX通過使用組合框選擇填充TableView

Question

我想用名爲ComboBoxSelectCustomer的組合框填充名爲CustomerTableView的TableView。基本上，用戶從ComboBox內部的客戶列表中選擇一個客戶，並且TableView將填充與該客戶名稱匹配的數據。我在每個客戶的SQL文件中有多個表，但由於某種原因，當我從組合框中選擇一個客戶名時，TableView上沒有任何反應，它只是空着。代碼沒有錯誤或任何問題，我只是認爲它的設置方式是導致問題的原因。請檢閱我的代碼，並告訴我我如何能以更好的方式設置這些方法後會有組合框觸發一個SQL語句來填充的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

創建一個setOnAction事件上ComboBoxSelectionCustomer只要用戶更改ComboBox上的選項，就允許TableView填充。

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