public boolean InsertUser(Users u) {
   boolean b = true;
   try {
     Class.forName("com.mysql.jdbc.Driver");
     ct = DriverManager.getConnection("jdbc:mysql://localhost:3306/walter", "root", "1234567890");
     ps =
         ct.prepareStatement(
             "insert into users (username,password,email,address,city) values(?,?,?,?,?);");
     ps.setObject(1, u.getUsername());
     ps.setObject(2, u.getPassword());
     ps.setObject(3, u.getEmail());
     ps.setObject(4, u.getAddress());
     ps.setObject(5, u.getCity());
     ps.executeUpdate();
   } catch (Exception e) {
     b = false;
     e.getStackTrace();
   } finally {
     if (rs != null) {
       try {
         rs.close();
       } catch (SQLException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
       }
       rs = null;
     }
     if (ps != null) {
       try {
         ps.close();
       } catch (SQLException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
       }
       ps = null;
     }
     if (ct != null) {
       try {
         ct.close();
       } catch (SQLException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
       }
       ct = null;
     }
   }
   return b;
 }