如何一次從JTable，數據庫中刪除多行

Question

我想一次從JTable刪除多行，但我一次只能刪除一行。 JTable一次只允許一個選擇嗎？如果我想通過選擇它們來刪除多行，java是否允許我們這樣做？即使我選擇多行，給定的代碼也只能一次刪除一行。

DBConnection是連接到MySql數據庫的類。

staffTable1是JTable

ShowStaffInStaffTable()變量名是通過使用getter二傳手類

這裏是我的代碼，我試圖從MySQL導入的數據來更新我的JTable行和列的功能：

int row = staffTable1.getSelectedRow(); 
DefaultTableModel model = (DefaultTableModel) staffTable1.getModel(); 

String selected = model.getValueAt(row, 9).toString(); 

if (row >= 0) { 
    try { 
     DBConnection DB12 = new DBConnection(); 
     Connection conn = DB12.Connect(); 
     String sql = "delete from staff where Contact_No= ?"; 
     PreparedStatement stmt = conn.prepareStatement(sql); 
     stmt.setString(1, selected); 
     stmt.executeUpdate(); 
     form12.ShowStaffInStaffTable(); 
    } catch (Exception w) { 
     JOptionPane.showMessageDialog(this, "Connection Error!"+w); 
     w.printStackTrace(); 
    } 
} 

Answer 1

下面顯示瞭如何從JTable（和JList）中刪除多個選定的行：

import java.awt.*; 
import java.awt.event.*; 
import java.util.Arrays; 
import java.util.ArrayList; 
import java.util.Collections; 
import java.util.List; 
import javax.swing.*; 
import javax.swing.table.*; 

public class ItemDeletion extends JPanel 
{ 
    private JList<String> list; 
    private JTable table; 

    public ItemDeletion() 
    { 
     setLayout(new BorderLayout(5, 5)); 

     String[] items = 
     { 
      "One", 
      "Two", 
      "Three", 
      "Four", 
      "Five", 
      "Six", 
      "Seven", 
      "Eight", 
      "Nine", 
      "Ten" 
     }; 

     // Add the list 

     DefaultListModel<String> listModel = new DefaultListModel<String>(); 

     for (String item: items) 
      listModel.addElement(item); 

     list = new JList<String>(listModel); 


     JButton listDelete = new JButton("Delete From List"); 
     listDelete.addActionListener(new ActionListener() 
     { 
      @Override 
      public void actionPerformed(ActionEvent e) 
      { 
       DefaultListModel model = (DefaultListModel)list.getModel(); 
       int row = list.getSelectedIndex(); 

       while (row != -1) 
       { 
        model.removeElementAt(row); 
        row = list.getSelectedIndex(); 
       } 
      } 
     }); 

     JPanel listPanel = new JPanel(new BorderLayout(5, 5)); 
     listPanel.add(new JScrollPane(list), BorderLayout.CENTER); 
     listPanel.add(listDelete, BorderLayout.PAGE_END); 

     // Add the table 

     DefaultTableModel tableModel = new DefaultTableModel(0, 1); 
     List<String> tableItems = Arrays.asList(items); 
     Collections.shuffle(tableItems); 

     for (String item: tableItems) 
     { 
      System.out.println(item); 
      tableModel.addRow(new String[]{item}); 
     } 

     table = new JTable(tableModel); 

     table.setAutoCreateRowSorter(true); 
     ((DefaultRowSorter)table.getRowSorter()).toggleSortOrder(0); 

     JButton tableDelete = new JButton("Delete From Table"); 
     tableDelete.addActionListener(new ActionListener() 
     { 
      @Override 
      public void actionPerformed(ActionEvent e) 
      { 
       DefaultTableModel model = (DefaultTableModel)table.getModel(); 
       int row = table.getSelectedRow(); 

       while (row != -1) 
       { 
        int modelRow = table.convertRowIndexToModel(row); 
        model.removeRow(modelRow); 
        row = table.getSelectedRow(); 
       } 
      } 
     }); 

     JPanel tablePanel = new JPanel(new BorderLayout(5, 5)); 
     tablePanel.add(new JScrollPane(table), BorderLayout.CENTER); 
     tablePanel.add(tableDelete, BorderLayout.PAGE_END); 

     add(listPanel, BorderLayout.LINE_START); 
     add(tablePanel, BorderLayout.LINE_END); 
    } 

    private static void createAndShowGUI() 
    { 
     JFrame frame = new JFrame("Multiple Item Deletion"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.add(new ItemDeletion(), BorderLayout.NORTH); 
     frame.setLocationByPlatform(true); 
     frame.pack(); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) 
    { 
     EventQueue.invokeLater(new Runnable() 
     { 
      public void run() 
      { 
       createAndShowGUI(); 
      } 
     }); 
    } 
} 

很明顯，您需要修改代碼以從數據庫中刪除該行。