Sql sql2 = Sqls.create("SELECT IFNULL(MAX(torder),0)+1 FROM banner");
                                    dao.execute(sql2);
                                    sql2.setCallback(Sqls.callback.integer());
                                    int torder = sql2.getInt();

Sql sql2 = Sqls.create("SELECT IFNULL(MAX(torder),0)+1 as count FROM banner");
                                    dao.execute(sql2);
                                    sql2.setCallback(new SqlCallback() {
                                        public Object invoke(Connection conn, ResultSet rs, Sql sql) throws SQLException {
                                            while (rs.next()){
                                                return rs.getString("count");
                                            }
                                            return null;
                                        }
                                    });
                                    int torder = sql2.getInt();

都是空指针？