Get records for last 3 days via Spring JPA Repository - spring

Question

I have an entity which contains field date.
#Entity
#Table(name="messages", schema = "users")
...
public class Message {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#Column(name = "author")
private String author;
#Column(name = "tags")
private String tags;
#Column(name = "message_date")
private LocalDate date;
#Override
public String toString() {
...
}
}
#Repository
public interface MessageRepository extends JpaRepository<Message, Long> {
Message findByMessageId(Long id);
}
I'm using Spring Data JPA with repository. I want to get all messages from database for last 3 days (field date). How can I do it with Spring JPA?
#Query(...?)
List<Message> findBy...?

Answer 1

I suggest to split the logic from the actual queries. A service could handle all the intermediate things, e.g.:
#Service
public class MessageService {
private final MessageRepository repository;
#Autowired
public MessageService(MessageRepository repository) {
this.repository = repository;
}
List<Message> getLastThreeDays() {
// subtract 3 days from today
LocalDate threeDaysAgoDate = LocalDate.now().minusDays(3);
return this.repository.findAllWithDateAfter(threeDaysAgoDate);
}
}
and your repository stays nice and clean:
#Repository
public interface MessageRepository extends JpaRepository<Message, Long> {
Optional<Message> findByMessageId(Long id);
#Query("select m from Message m where date >= :threeDaysAgoDate")
List<Message> findAllWithDateAfter(#Param("threeDaysAgoDate") LocalDate threeDaysAgoDate);
}