thjanssen

@Entity
public class Customer {

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

	@Column
	private String firstName;

thjanssen

@Entity
public class Book {

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

  @NaturalId
  private String isbn;

thjanssen

HashMap<String, Object> hints = new HashMap<>();
hints.put("javax.persistence.query.timeout", 1000);

em.find(Author.class, 1L, hints);

thjanssen

@Entity
@NamedQuery(name = “Hibernate5Book.findByTitle”, query = “SELECT b FROM Hibernate5Book b WHERE b.title = :title”)
@NamedQuery(name = “Hibernate5Book.findByPublishingDate”, query = “SELECT b FROM Hibernate5Book b WHERE b.publishingDate = :publishingDate”)
public class Hibernate5Book implements Serializable {
	…
}

thjanssen

@Entity
public class Author {
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	@Column(name = “id”, updatable = false, nullable = false)
	private Long id;
	
	@Column
	private LocalDate dateOfBirth;

thjanssen

@Entity
public class Book {
	
	...
	
	@Column
	private LocalDate publishingDate;
	
	...
	

thjanssen

// Prepare query
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Tuple> q = cb.createTupleQuery();
Root<Author> author = q.from(Author.class);

// Select multiple scalar values
q.multiselect(author.get(Author_.firstName).alias("firstName"), author.get(Author_.lastName).alias("lastName"));

List<Tuple> authorNames = em.createQuery(q).getResultList();

thjanssen

List<Book> books = session.createQuery("SELECT b FROM Book b", Book.class).list();
books.stream()
	.map(b -> b.getTitle() + " was published on " + b.getPublishingDate())
	.forEach(m -> log.info(m));

thjanssen

List<Object[]> result = em.createQuery(
	"SELECT a, p FROM Author a JOIN a.publications p 
WHERE treat(p AS Book).title LIKE '%Java%'")
	.getResultList();

thjanssen

Session session = em.unwrap(Session.class);