1. jpa ,如果只想用jpa查询固定条数的数据,可以这么操作
User findFirstByOrderByLastnameAsc();
User findTopByOrderByAgeDesc();
Page<User> queryFirst10ByLastname(String lastname, Pageable pageable);
Slice<User> findTop3ByLastname(String lastname, Pageable pageable);
List<User> findFirst10ByLastname(String lastname, Sort sort);
List<User> findTop10ByLastname(String lastname, Pageable pageable);
List<User> findAllByUserNameEquals(String userName,Pageable pageable);
调用的时候
userRepository.findAllByUserNameEquals("关关", PageRequest.of(0,10)); //其中0为page,10为size
3. jpa使用语法: