Update or saveorUpdate in CRUDRepository

Question

I know there's already a similar question answered previously, but my problem is implementing save with update while there are 3 methods in the interface. I'm currently using the following methods in my project and don't know how to make saveOrUpdate in this. The following are my classes:

   public interface CompanyRepository extends CrudRepository<Company,Long>{    Company findByCompanyName (String companyName);    List<Company> findAll();    Company findById(Long id);    } 

The following is part of my Company Class

@Entity public class Company extends BaseEntity{  @NotNull @Size(min = 2, max = 16) private String companyName; @Length(max = 60) private String desc; //TODO max: add LOGO class later for pic saving @OneToMany private List<MobileModel> mobileModels;  public Company() {   super();   mobileModels = new ArrayList<>();   }  //Getters n setters  } 

The following is my baseEntity clas

@MappedSuperclass public abstract class BaseEntity { @Id @GeneratedValue(strategy =  GenerationType.AUTO) protected final Long id;  @Version private Long version;   //Getters n setters } 

Thanks in advance. I read everywhere and tried so many things for 5 hours. I just want CompanyRepository to implement all 3 methods without me overriding them in some other class but if I have too then explain how because part of my code is dependent on CompanyRepository. I just wish to add save with update, please explain with respect to my code.

Answer 1

CrudRepository has only save but it acts as update as well.

• When you do save on entity with empty id it will do a save.
• When you do save on entity with existing id it will do an update that means that after you used findById for example and changed something in your object, you can call save on this object and it will actually do an update because after findById you get an object with populated id that exist in your DB.
• save in CrudRepository can accept a single entity or Iterable of your entity type.