mybatisplus返回指定字段的两种方式

QueryWrapper<User> wrapper = new QueryWrapper<>();
    wrapper.select("id","name").like("name","张三").lt("age",40);
    return userMapper.selectList(wrapper);

//查询所有用户
        LambdaQueryWrapper<PhotoUser> wrapperUser = Wrappers.lambdaQuery();
        wrapperUser.select(PhotoUser::getNickname,PhotoUser::getAppellation).or().in(PhotoUser::getId,userIdList);
        List<PhotoUser> photoUsers = userService.list(wrapperUser);