使用Spring Data通过实体ID从实体获取嵌入式对象

Question

I have an entity Applicant which contains @Embedded Name object ( firstName , lastName etc.). I would like to get only the embedded object from database by applicant id using Spring Data.

I'm trying like this:

public interface ApplicantRepository extends Repository<Applicant, UUID> {
    Optional<Name> findNameById(final UUID applicantId);
}

but it returns the whole Applicant entity instead of just Name. Is there any option to name the function in different way to achieve this with Spring Data?

Answer 1

You can do this by using Query Annotation in Spring-data.

    @Query("select applicant.name from Applicant applicant where applicant.id = :id")
    Optional<Name> findApplicantNameById(@Param("id") Integer id);