CODEWITHSUNDEEP
javahibernatejpa
ScorprocS
ScorprocS

Reputation: 377

Hibernate Java persist a subclass entity from persisted superclass

I have an Agent class and a User class which extends Agent. I would like to cast a persisted Agent to a User and persist the user using the same id, name and firstname. I don't what to insert an other line into Agent table. How can I do that ?

Here are my classes.

@Entity
@Table(name = "agent")
@Inheritance(strategy = InheritanceType.JOINED)
public class Agent {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    protected Integer id;

    @Column(name = "fistname", nullable = false)
    protected String fistname;

    @Column(name = "name", nullable = false)
    protected String name;
}

@Entity
@Table(name="user")
public User extends Agent{
   @Column(name = "login", nullable = false, unique = true)
   public String login;
   @Column(name = "password", nullable = false)
   public String password;

I would like to do that

Agent agent=agentService.findOne(1);
User user = new User(agent);
user.setLogin("login");
...
user=userService.saveAndFlush(user);
ok = user.getId() == agent.getId();

To sum up I'd like to grant an Agent to a User when I need it.

Upvotes: 1

Views: 966

Answers (2)

ScorprocS
ScorprocS

Reputation: 377

I've tought doing this. It's working but I lose the fact that a user is a specialized Agent.

@Entity
@Table(name = "agent")
@Inheritance(strategy = InheritanceType.JOINED)
public class Agent {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    protected Integer id;

    @Column(name = "fistname", nullable = false)
    protected String fistname;

    @Column(name = "name", nullable = false)
    protected String name;
}

@Entity
@Table(name="user")
public User {
   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   protected Integer id;
   @OneToOne
   @JoinColumn(name = "id_agent",nullable = false)
   protected Agent agent;
   @Column(name = "login", nullable = false, unique = true)
   private String login;
   @Column(name = "password", nullable = false)
   private String password;

Upvotes: 0

Youssef NAIT
Youssef NAIT

Reputation: 1530

You can't cast an Agent to a User, but you can build a user from an Agent by setting the Agent's properties in the User propeties, unless you have added a copy constructor from Agent ->User in the User class, in both cases a new User will be created and a new row will be added.

Upvotes: 1

Related Questions