Hibernate: store embedded map of primitves

Question

How to store following the entity using Hibernate?

@Entity
class A {
  private Map<String, String> b;

  // getters and setters omitted
}

`@ElementCollection`. See [this answer](https://stackoverflow.com/a/3393780/5449250) — Anatoly Shamov, Oct 03 '17 at 13:34
Possible duplicate of [Storing a Map using JPA](https://stackoverflow.com/questions/3393649/storing-a-mapstring-string-using-jpa) — Anatoly Shamov, Oct 03 '17 at 13:34

score 0 · Answer 1 · answered Oct 03 '17 at 13:34

Have a look at @ElementCollection

Example usage:

@Entity
public class User {

   public String getLastname() { ...}

   @ElementCollection
   @CollectionTable(name="Nicknames", joinColumns=@JoinColumn(name="user_id"))
   @Column(name="nickname")
   public Set<String> getNicknames() { ... } 
}

score 0 · Answer 2 · answered Oct 03 '17 at 13:34

Using Save

Here an example:

A variable = new A();
variable.b(your_variable);

Then

session.save(varible);

can be used. Or you mean to store in a database by the storage? Then will be so:

  SessionFactory factory=cfg.buildSessionFactory();   
  Session session=factory.openSession();  
  Transaction t=session.beginTransaction();   
  A e1=new A();  
  e1.setb(your_variable);  
  session.persist(e1);
  t.commit();
  session.close();

Mention: your naming is quite bad. You should put something else!

Also, with the @ElementCollection annotation you can use java.util.Map collections. In the declaration of your class (in your case, A).

score 0 · Answer 3 · answered Oct 03 '17 at 13:37

0

It seems like you should use @ElementCollection and @CollectionTable from JPA: How to annotate Map<Entity,INTEGER> with JPA?

answered Oct 03 '17 at 13:37

Zufar Muhamadeev

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Hibernate: store embedded map of primitves

3 Answers3