'Hibernate one-to-one cascade-all don't work

'Dear masters, currently learning Spring+Hibernate. I added HibernateUtil class to use it after for creating/deleting etc commands. I used cascadeALL for one-to-one mapping and when i run delete or create classes, they update only Instructor table in db, not related Instuctor Detail table. It works, if i write commands like in CreateDemo class - session.save(tempInstructor); session.save(tempInstructorDetail); but as i understand i should be able to write only session.save(tempInstructor); - and this would update also linked table. The same for DeleteDemo. Why cascade = CascadeType.ALL does not work?'

enter code here
      

@Entity
@Table(name = "instructor")
public class Instructor {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column( name = "id")
private int id;

@Column(name = "first_name")
private String firstName;

@Column(name = "last_name")
private String lastName;

@Column(name = "email")
private String email;

@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "instructor_detail_id")
private InstructorDetail instructorDetail;
enter code here





@Entity
@Table(name = "instructor_detail")
public class InstructorDetail {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private int id;

@Column(name = "youtube_channel")
private String youtubeChannel;

@Column(name = "hobby")
private String hobby;

enter code here



@SpringBootApplication
public class CreateDemo {

public static void main(String[] args) {
    SpringApplication.run(CreateDemo.class, args);

   Instructor tempInstructor = new Instructor('Vilma', 'Kalna', '[email protected]');
   InstructorDetail tempInstructorDetail = new InstructorDetail('www.vilma- 
teaching.com/youtube', 'teaching');

    try (Session session = HibernateUtil.getSessionFactory().openSession()) {

        session.beginTransaction();
        System.out.println('Saving instructor: ' + tempInstructor);
        //this will also save the details object
        //because of CascadeType.ALL
        session.save(tempInstructor);
        session.save(tempInstructorDetail);
        session.getTransaction().commit();

    } catch (Exception e) {
        e.printStackTrace();
    }
 }
}

enter code here



public class DeleteDemo {
public static void main(String[] args) {

    try (Session session = HibernateUtil.getSessionFactory().openSession()) {

        session.beginTransaction();

        int theId = 2;
        Instructor tempInstructor = session.get(Instructor.class, theId);

        System.out.println('Found instructor: ' + tempInstructor);

        if(tempInstructor != null){
            System.out.println('Deleting: ' + tempInstructor);
            //will also delete associated details obj (Cascade)
            session.delete(tempInstructor);
        }

        session.getTransaction().commit();

    } catch (Exception e) {
        e.printStackTrace();
enter code here

public class HibernateUtil {
private static SessionFactory sessionFactory;

public static SessionFactory getSessionFactory() {

    if (sessionFactory == null) {
        try {
            Configuration configuration = new Configuration();

            // Hibernate settings equivalent to hibernate.cfg.xml's properties

            Properties settings = new Properties();
            settings.put(Environment.DRIVER, '');
            settings.put(Environment.URL, '');
            settings.put(Environment.USER, '');
            settings.put(Environment.PASS, '');
            settings.put(Environment.DIALECT, 'org.hibernate.dialect.MySQL5Dialect');
            settings.put(Environment.SHOW_SQL, 'true');
            settings.put(Environment.CURRENT_SESSION_CONTEXT_CLASS, 'thread');

            configuration.setProperties(settings);

            configuration.addAnnotatedClass(Instructor.class);
            configuration.addAnnotatedClass(InstructorDetail.class);

            ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
                    .applySettings(configuration.getProperties()).build();

            sessionFactory = configuration.buildSessionFactory(serviceRegistry);

        } catch (Exception e) {
            e.printStackTrace();
        }

    }
    return sessionFactory;
enter code here
javaspringhibernateone-to-onecascade


Solution 1:[1]

While creating the entities there should be Bi-directional mapping. Create the below attribute in instructor detail and create getters and setters for it.

    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "instructor_id")
    private Instructor instructor;

Create the below function inside the instructor detail entity

public void add(Instructor instructor) {
       this.instructor = instructor;
       instructor.setInstructorDetail(this)
    }

While creating the instructor call the above function using instructor detail object that is related to instructor object like,

instructorDetail.add(instructor);

Solution 2:[2]

The InstructorDetail class also needs to do cascading because it should be bi-direction.

@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "instructor_id")
private Instructor instructor;

And create setter and getter for the instructor. I hope this will work

Sources

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Source: Stack Overflow

Solution Source
Solution 1
Solution 2

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