Does Spring Data JPA have any way to count entites using method name resolving?

Question

Spring Data JPA supports counting entities using specifications. But does it have any way to count entities using method name resolving? Let\'s say I want a method cou

Answer 1

According to Abel, after the version 1.4 (tested in version 1.4.3.RELEASE) is possible doing this way:

public long countByName(String name);

Answer 2

@Autowired
private UserRepository userRepository;

@RequestMapping("/user/count")
private Long getNumberOfUsers(){
    return userRepository.count();
}

Answer 3

JpaRepository also extends QueryByExampleExecutor. So you don't even need to define custom methods on your interface:

public interface UserRepository extends JpaRepository<User, Long> {
    // no need of custom method
}

And then query like:

User probe = new User();
u.setName = "John";
long count = repo.count(Example.of(probe));

Answer 4

I have only been working with it for a few weeks but I don't believe that this is strictly possible however you should be able to get the same effect with a little more effort; just write the query yourself and annotate the method name. It's probably not much simpler than writing the method yourself but it is cleaner in my opinion.

Edit: it is now possible according to DATAJPA-231

Answer 5

According to the issue DATAJPA-231 the feature is not implemented yet.

Answer 6

Apparently it is implemented now DATAJPA-231