JPA query

Esempio di utilizzo di query JPA:

EntityManagerFactory emf = Persistence.createEntityManagerFactory(
"JPATutorialPU" );
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();

try {

Query query = em.createQuery("SELECT i FROM Item i WHERE i.name LIKE :keyword");
query.setParameter("keyword","%"keyword"%");
Item item = (Item)query.getResultList();

String myitem = item.getItem();

} catch (Exception e) {
System.out.println( e.getMessage() );
em.getTransaction().rollback();
} finally {
em.close();
}