How to connect DB with applet

hi, all
I am use Mysql as my DB, but when I my program as window application, it is work, but when I run it as Applet, it won't work, can any one tell me how to access the data from DB to Applet?
public class AppletApp extends JApplet {
public void init() {
     DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
     try
           Class.forName("org.gjt.mm.mysql.Driver");
            catch(Exception e)
                 System.out.println(e.toString());
              Connection cn;
              Statement st;
              ResultSet rs ;
          try
                 cn = DriverManager.getConnection("jdbc:mysql://localhost:3306/cti", "root", "123");
                st =cn.createStatement();
                rs = st.executeQuery("select name from parent");
          while (rs.next())
               //System.out.println(rs.getString("name"));
               DefaultMutableTreeNode NewNode = new DefaultMutableTreeNode(rs.getString("name"));
               root.add(NewNode);
          rs.close();
          st.close();
          cn.close();
            }catch(SQLException se)
          System.out.println(se.toString());
     /*DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("node1");
     root.add(node1);
     node1.add(new DefaultMutableTreeNode("sub1_1"));
     node1.add(new DefaultMutableTreeNode("sub1_2"));
     setSize(400, 400);*/
     getContentPane().add(new JTree(root));
public static void main(String arg[]) {
     JFrame myFrame = new JFrame();
     Container contentPane = myFrame.getContentPane();
     contentPane.setLayout(new GridLayout(1,2));
     AppletApp app = new AppletApp();
     contentPane.add(app, BorderLayout.CENTER);
     app.init();
     app.start();
     myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     myFrame.setSize (600,600);
     myFrame.setVisible(true);
}

I had signed the applet and there is a .jar file, but when I type
AppletViewer tree.html
there are still an sercuity error come out, so thing else I need to do?
am I need to modifty the html file? right now my html file resource code are look like this:
<html>
<applet code = x.class heigh = 300 width = 300>
</applet>
</html>

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