CODEWITHSUNDEEP
javamysqlhibernatejpa
enigma969
enigma969

Reputation: 427

JPA avoid loading Objects before Insert

Person has a foreign key of the field "Language". How can I avoid loading the whole "Language" object if I just got the PK of a language ("json.get("language").asInt()) and want to insert a new Person?

@Entity
public class Person {
   String prename;
   String lastname;
   Language language;
}


Person p = new Person("Robert", "Meyer");
Language l = JPA.em().find(Language.class, json.get("language").asInt();
p.setLanguage(l);

Is it possible to do it in a way without having to load the whole Language object?

Upvotes: 0

Views: 114

Answers (1)

Predrag Maric
Predrag Maric

Reputation: 24433

You could use EntityManager#getReference().

Get an instance, whose state may be lazily fetched. If the requested instance does not exist in the database, the EntityNotFoundException is thrown when the instance state is first accessed. 

Person p = new Person("Robert", "Meyer");
Language l = JPA.em().getReference(Language.class, json.get("language").asInt();
p.setLanguage(l);

Upvotes: 3

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