從MySQL提交一個Jframe

Question

真的在我的項目上遇到了麻煩，我對java很陌生，對數據庫來說真的很陌生。我在我的代碼中所做的是用一堆單詞填充「數據」對象，但我想要做的是用來自我創建的數據庫的信息填充這些框架。我一直在谷歌搜索和搜索幾天，並沒有發現任何有助於我理解我需要做的事情。任何幫助將不勝感激。

import java.awt.*; 
import javax.swing.*; 
import javax.swing.border.*; 
import javax.swing.table.*; 
import java.awt.event.*; 

public class Project3 extends JFrame { 
private JPanel contentPane; 
private JTable table_1; 
private JScrollPane scrollPane; 
String[] columnNames = { "Restaurant", "Dish", "Type", "Price", "Rating" }; 
Object[][] data = { 
     { "Nemo", "Vesuvio", "Pizza", new String("65kr"), new Integer(7) }, 
     { "John", "Doe", "Rowing", new Integer(3), new Boolean(true) }, 
     { "Sue", "Black", "Knitting", new Integer(2), new Boolean(false) }, 
     { "Jane", "White", "Speed reading", new Integer(20), 
       new Boolean(true) }, 
     { "Joe", "Brown", "Pool", new Integer(10), new Boolean(false) } }; 

/** 
* Launch the application. 
*/ 
public static void main(String[] args) { 
    EventQueue.invokeLater(new Runnable() { 
     public void run() { 
      try { 
       Project3 frame = new Project3(); 
       frame.setVisible(true); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     } 
    }); 
} 

/** 
* Create the frame. 
*/ 
public Project3() { 
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    setBounds(100, 100, 800, 600); 
    contentPane = new JPanel(); 
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); 
    contentPane.setLayout(new BorderLayout(0, 0)); 
    setContentPane(contentPane); 
    JPanel panel = new JPanel(); 
    contentPane.add(panel, BorderLayout.CENTER); 
    panel.setLayout(null); 
    scrollPane = new JScrollPane(); 
    scrollPane.setBounds(139, 162, 469, 420); 
    panel.add(scrollPane); 
    table_1 = new JTable(data, columnNames); 
    scrollPane.setViewportView(table_1); 
    table_1.setFillsViewportHeight(true); 
    table_1.setModel(new DefaultTableModel(new Object[][] { 
      { "Nemo", "blah", "Pizza", "65kr", new Integer(7) }, 
      { "Nemo", "blah", "Rowing", "1 000 000kr", Boolean.TRUE }, 
      { "Sue", "blah", "Knitting", new Integer(2), Boolean.FALSE }, 
      { "Jane", "blah", "Speed reading", new Integer(20), 
        Boolean.TRUE }, 
      { "Joe", "Brown", "Pool", new Integer(10), Boolean.FALSE }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, 
      { null, null, null, null, null }, }, new String[] { 
      "Restaurant", "Dish", "Type", "Price", "Rating" })); 
    JButton btnChangeadd = new JButton("Change/Add"); 
    btnChangeadd.addMouseListener(new MouseAdapter() { 
     @Override 
     public void mouseClicked(MouseEvent e) { 
      // CALL CHANGE METHOD HERE 
     } 
    }); 
    btnChangeadd.setFont(new Font("Lucida Grande", Font.PLAIN, 16)); 
    btnChangeadd.setBounds(143, 104, 175, 42); 
    panel.add(btnChangeadd); 
    JLabel lblNewLabel = new JLabel("Welcome RestaurantID"); 
    lblNewLabel.setFont(new Font("Lucida Grande", Font.PLAIN, 24)); 
    lblNewLabel.setBounds(264, 56, 260, 36); 
    panel.add(lblNewLabel); 
    JButton button = new JButton("+"); 
    button.addMouseListener(new MouseAdapter() { 
     @Override 
     public void mouseClicked(MouseEvent e) { 
      // CALL SOMETHING HERE IF YOU WANT 
     } 
    }); 
    button.setBounds(66, 248, 40, 29); 
    panel.add(button); 
    JButton button_1 = new JButton("-"); 
    button_1.addMouseListener(new MouseAdapter() { 
     @Override 
     public void mouseClicked(MouseEvent e) { 

     } 
    }); 
    button_1.setBounds(66, 289, 40, 29); 
    panel.add(button_1); 
    JButton btnDelete = new JButton("Delete"); 
    btnDelete.addMouseListener(new MouseAdapter() { 
     @Override 
     public void mouseClicked(MouseEvent e) { 
      //DELETE METHOD 
     } 
    }); 
    btnDelete.setFont(new Font("Lucida Grande", Font.PLAIN, 16)); 
    btnDelete.setBounds(344, 104, 191, 42); 
    panel.add(btnDelete); 
    JButton btnLogOut = new JButton("Log out"); 
    btnLogOut.addMouseListener(new MouseAdapter() { 
     @Override 
     public void mouseClicked(MouseEvent e) { 
     } 
    }); 
    btnLogOut.setBounds(667, 6, 117, 29); 
    panel.add(btnLogOut); 
} 

}

Answer 1

開始與JDBC tutorial，然後研究文章Table From Database。此外，

• 使用常量或工廠時可用，而不是無謂的構造函數，例如：

  {"Nemo", "Vesuvio", "Pizza", "65kr", 7}, 
  {"John", "Doe", "Rowing", 3, true}, 
  {"Sue", "Black", "Knitting", Integer.valueOf(3), Boolean.FALSE}, 
  

• 使用@Override註解，以避免不小心超載：

  @Override 
  public void run() { 
      ... 
  } 
  

• 開始使用Java Collections Framework來擁抱對象方向，而不是數組。請注意引用的示例如何指定形式參數，如List<T>，其中List是接口類型，而T是泛型類型參數。