@Override
 public boolean add(Admin admin) {
   InsertBuilder builder = new NullInsertBuilder("admin");
   builder.setLong("adminId", admin.getAdminId());
   builder.setString("username", admin.getUsername());
   builder.setString("password", admin.getPassword());
   builder.setList("roles", admin.getRoleList());
   builder.setString("salt", admin.getSalt());
   builder.setString("name", admin.getName());
   builder.setBool("disabled", admin.isDisabled());
   builder.setDate("posttime", admin.getPosttime());
   return jdbc.insertForBoolean(builder);
 }