Selecting All JPA Entities As Criteria Query
You could define a NamedQuery "SELECT c FROM ConfigurationEntry c" or use a type safe criteria variant in JPA 2+:
@PersistenceContext
EntityManager em;
public List<ConfigurationEntry> allEntries() {
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<ConfigurationEntry> cq = cb.createQuery(ConfigurationEntry.class);
Root<ConfigurationEntry> rootEntry = cq.from(ConfigurationEntry.class);
CriteriaQuery<ConfigurationEntry> all = cq.select(rootEntry);
TypedQuery<ConfigurationEntry> allQuery = em.createQuery(all);
return allQuery.getResultList();
}
This post is bit selfish: now I have a cheat sheet to lookup the first three lines. I just cannot remember these.
See you at Java EE Workshops at MUC Airport!
The snippet was stolen from: https://github.com/AdamBien/e2ftp
This is really too verbose
Posted by Solerman Kaplon on August 08, 2013 at 07:44 PM CEST #
Perfect! Now we just have to get back to be paid in lines of code… :)
Posted by Oliver Gierke on August 09, 2013 at 03:28 PM CEST #
This is why CriteriaQuery need some simplify...
Posted by airborn on August 11, 2013 at 02:43 AM CEST #
Great!
Exactly what I needed.
Thanks for sharing.
@airborn:
put this method in an abstract Facade of your Entities and let your EntityFacade inherit.
Type once and never again.
I don't even have to remember this post, Adam ;-)
Posted by superwese on November 09, 2013 at 04:12 AM CET #
Is there anything wrong with:
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Party> cq = cb.createQuery(Party.class);
TypedQuery<Party> allQuery = em.createQuery(cq);
List<Party> parties = allQuery.getResultList();
Posted by Karl on December 02, 2013 at 05:04 AM CET #