Question

我正在使用spring boot 2.2.0和spring数据，我想在创建父对象后保存一个子实体。这是我的课程

@Entity
@Table(schema = "public", name = "person")
@Inheritance(strategy = InheritanceType.JOINED)
public class Person implements Serializable{

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @Column(name = "first_name", length = 100)
    private String firstName;
...\\ getters and setters
}

@Table(name = "`owner`")
@PrimaryKeyJoinColumn()
public class Owner extends Person implements Serializable {
\\ some other properties
}

@Table(name = "`owner`")
@PrimaryKeyJoinColumn()
public class User extends Person implements Serializable {
\\ some more properties, username, etc
}

我正在使用JpaRepositroy

public interface PersonRepository extends JpaRepository<Person, Integer> {

}
public interface UserRepository extends JpaRepository<User, Integer> {

}

public interface OwnerRepository extends JpaRepository<Owner, Integer> {

}

我可以创建一个没有任何其他属性的人员，但对于子类，JPA还会尝试保存一个非目的的新人员，我的BO会像这样保存信息

class BOWithRepositories{
 public OwnerDTO save(OwnerDTO dto) {
        if (dto.getId() == null) {
            throw new InvalidDataException("the id for the owner can not be empty or null");
        }
        Optional<Person> person = personRepository.findById(dto.getId());
        if (!person.isPresent()) {
            String message = String.format("The person with id %d does not exists, are trying to create a new Owner instead to convert a Person to owner?", dto.getId());
            throw new EntityNotFoundException(message);
        }
        Owner owner = new Owner();
        owner.setId(person.get().getId());
        owner.setActiveBusNumber(0);
        owner.setTotalBusNumber(0);
        owner.setFirstName(person.get().getFirstName());
        owner.setLastName(person.get().getLastName());
        owner.setDocumentNumber(person.get().getDocumentNumber());
        owner.setDocumentType(person.get().getDocumentType());
        ownerRepository.save(owner);
        dto = toDTO((Owner)person.get());
        return dto;
    }
}

我想将新的子类转换为父类。我的意思是我想用一个Person的所有现有数据创建一个新所有者。

使用JOINED继承为具有Spring数据的现有父级保存子实体

0 个答案: