public static Operater check(String name, String password) {
        Operater operater=new Operater();//操作员信息对象
        String sql = "select *  from tb_operator where name='" + name
                + "' and password='" + password + "'and admin=1";//查询字符串
        ResultSet rs = Dao.executeQuery(sql);//执行查询
        try {
            while (rs.next()) {//如果查询到了记录
                operater.setId(rs.getString("id"));//设置操作员编号
                operater.setName(rs.getString("name"));//设置操作员用户名
                operater.setGrade(rs.getString("admin"));//设置操作员等级
                operater.setPassword(rs.getString("password"));//设置管理员密码
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        Dao.close();    //关闭连接对象
        return operater;//返回操作员信息对象
    }