thjanssen

@Entity
public class MyEntity {

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	@Column(name = “id”, updatable = false, nullable = false)
	private Long id;

	@Column
	private String value;

thjanssen

List<Author> authors = em.createQuery(“SELECT a FROM Author a ORDER BY a.id”, Author.class)
  .setMaxResults(5)
  .setFirstResult(0)
  .getResultList();

thjanssen

Book b = new Book();
b.setTitle(“The Hound of the Baskervilles”);
b.setPublishingDate(LocalDate.of(1902, 4, 30));
em.persist(b);

thjanssen

@Entity
public class Author {

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Column(name = "id", updatable = false, nullable = false)
	private Long id;

	…
}

thjanssen

StoredProcedureQuery q = this.em.createNamedStoredProcedureQuery(“getReviews”);
q.setParameter(2, b.getId());
List<Review> reviews = q.getResultList();

thjanssen

@Entity
public class Author {

	…

	@Column
	private LocalDate dateOfBirth;

	public int getAge() {
		return return Period.between(dateOfBirth, LocalDate.now()).getYears();

thjanssen

@Entity(name = “BlogPost”)
public class BlogPost extends Publication {

	@Column
	private String url;

	…
}

thjanssen

Session session = em.unwrap(Session.class);
SessionFactory sessionFactory = em.getEntityManagerFactory().unwrap(SessionFactory.class);

thjanssen

@Entity
@Immutable
public class BookView {

  …

}

thjanssen

Statistics stats = sessionFactory.getStatistics();
long queryCount = stats.getQueryExecutionCount();