我不能多次顯示照片blob

Question

我有一個數據庫，包含每個人的照片。我有一堂課展示了人們的照片。當類首先運行時，它將本地存儲，然後另一種方法將其採用並顯示它。問題是這個類只在第一次正確工作！其他名稱選擇顯示第一張照片。請幫助我確定這是怎麼發生的！

這裏是我的類：

public class Profile extends JFrame { 

    int x; 
    JLabel label; 
    Image img; 
    ImageIcon pic; 
    JPanel panel; 
    private JTextPane namepanel = new JTextPane(); 
    private JLabel namelabel = new JLabel(); 
    private JLabel lastnamelabel = new JLabel(); 
    private JTextPane lastnamepanel = new JTextPane(); 
    ResultSet resultSet; 
    private JButton add = new JButton(); 
    private JButton remove = new JButton(); 

    public Profile() { 
     try { 

      //getData(x); 
      //showImage(); 
      //jbInit(); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 


    } 


    public void getData(int p_id) throws Exception { 



     Login login = new Login(); 
     String url = "jdbc:oracle:thin:@localhost:1521:ORCL"; 
     String username = login.getUsername(); 
     String password = login.getPassword(); 
     Connection conn = null; 

     try { 

      Class.forName("oracle.jdbc.driver.OracleDriver"); 
      conn = DriverManager.getConnection(url, username, password); 
      System.out.println("At the profile class id = " + p_id); 
      String sql = "SELECT foto, name, surname FROM criminals WHERE id = " + p_id; 
      System.out.println(sql); 
      PreparedStatement stmt = conn.prepareStatement(sql); 
      resultSet = stmt.executeQuery(); 

      while (resultSet.next()) { 
       namepanel.setText(resultSet.getString(2)); 
       lastnamepanel.setText(resultSet.getString(3)); 

       File image = new File("java.jpg"); 
       FileOutputStream fos = new FileOutputStream(image); 
       byte[] buffer = new byte[256]; 


       // Get the binary stream of our BLOB data 

       InputStream is = resultSet.getBinaryStream(1); 
       int bytes = 0; 
       while ((bytes = is.read(buffer)) > 0) { 


        fos.write(buffer, 0, bytes); 
       } 
       showImage(); 

       fos.close(); 

      } 
     } catch (SQLException e) { 
      e.printStackTrace(); 
     } finally { 
      if (conn != null && !conn.isClosed()) { 
       conn.close(); 
      } 
     } 


    } 


    public void showImage() throws Exception { 

     this.getContentPane().removeAll(); 
     img = null; 
     img = new ImageIcon("java.jpg").getImage(); 
     pic = null; 
     pic = new ImageIcon(img); 
     label = new JLabel("", pic, JLabel.CENTER); 
     panel = new JPanel(new BorderLayout()); 
     panel.setBounds(new Rectangle(0, 0, 340, 310)); 
     namepanel.setBounds(new Rectangle(340, 30, 295, 35)); 
     namelabel.setText("Name"); 
     namelabel.setBounds(new Rectangle(340, 0, 295, 30)); 
     lastnamelabel.setText("Surname"); 
     lastnamelabel.setBounds(new Rectangle(340, 65, 295, 30)); 
     lastnamepanel.setBounds(new Rectangle(340, 105, 295, 35)); 
     add.setText("add"); 
     add.setBounds(new Rectangle(440, 175, 255, 40)); 
     remove.setText("remove"); 
     remove.setBounds(new Rectangle(440, 240, 255, 35)); 
     panel.add(label, null); 
     panel.add(label, BorderLayout.CENTER); 
     this.getContentPane().setLayout(null); 
     this.setSize(new Dimension(1148, 336)); 
     this.getContentPane().add(remove, null); 
     this.getContentPane().add(add, null); 
     this.getContentPane().add(lastnamepanel, null); 
     this.getContentPane().add(lastnamelabel, null); 
     this.getContentPane().add(namelabel, null); 
     this.getContentPane().add(namepanel, null); 
     this.getContentPane().add(panel, null); 


    } 

Answer 1

您所使用的方法是使用PreparedStatement的的不路。使用這種方式

 String sql = "SELECT foto, name, surname FROM criminals WHERE id = ?" ; 

     PreparedStatement stmt = conn.prepareStatement(sql); 

stmt.setInt(1,p_id); 

Answer 2

我找到了解決方案！這是爲了防止其他人搜索它！

  Class.forName("oracle.jdbc.driver.OracleDriver"); 
      conn = DriverManager.getConnection(url, username, password); 
      System.out.println("At the profile class id = " + p_id); 
      String sql = "SELECT foto, name, surname FROM criminals WHERE id = " + p_id; 
      System.out.println(sql); 
      PreparedStatement stmt = conn.prepareStatement(sql); 
      resultSet = stmt.executeQuery(); 
      byte[] bytes = null; 
      while (resultSet.next()) { 
       namepanel.setText(resultSet.getString(2)); 
       lastnamepanel.setText(resultSet.getString(3)); 
       bytes = resultSet.getBytes(1); 
      } 
      resultSet.close(); 
      stmt.close(); 
      conn.close(); 
      if (bytes != null) { 
       JFrame f = new JFrame(); 
       image = f.getToolkit().createImage(bytes); 


      } 
     } catch (Exception e) { 
     } 
     jbInit(); 
    } 


    public void jbInit() throws Exception { 


     pic = new ImageIcon(image); 
     label = new JLabel("", pic, JLabel.CENTER); 

}