JSP用JDBC连接Mysql，能插入数据，却查询不到数据

Question

连接成功后

 Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
//          stmt.execute("insert into num values('hello')");

            String sql = "select * from num where 1";
            ResultSet rs =  stmt.executeQuery(sql);
            System.out.println("查询完成");
            System.out.println(rs.getRow());

Answer 1

每次getRow()总是0