thjanssen

@Entity
public class Book {

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

	@OneToMany(mappedBy = “book”)
	private List reviews = new ArrayList();

thjanssen

Query q = em.createQuery("SELECT a, size(a.books) FROM Author a GROUP BY a.id");
List<Object[]> results = q.getResultList();

thjanssen

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

thjanssen

ServiceRegistry standardRegistry = new StandardServiceRegistryBuilder().configure()
                                                                       .build();

thjanssen

@Entity
public class Book {

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

thjanssen

Book b = em.find(Book.class, 1L);

Author a = new Author();
a.setFirstName("Thorben");
a.setLastName("Janssen");

a.getBooks().add(b);
b.getAuthors().add(a);

em.persist(a);

thjanssen

EntityManager em = emf.createEntityManager();
em.getTransaction().begin();

FullTextEntityManager fullTextEm = Search.getFullTextEntityManager(em);
QueryBuilder tweetQb = fullTextEm.getSearchFactory().buildQueryBuilder().forEntity(Tweet.class).get();
Query tweetQuery = tweetQb.all().createQuery();
FullTextQuery fullTextQuery = fullTextEm.createFullTextQuery(tweetQuery, Tweet.class);

thjanssen

@Entity
public class Author {

	@Temporal(TemporalType.DATE)
	private Date dateOfBirth;
	...
}

thjanssen

@AnalyzerDef(
	name = “textanalyzer”,
	tokenizer = @TokenizerDef(factory = StandardTokenizerFactory.class),
	filters = {
		@TokenFilterDef(factory = LowerCaseFilterFactory.class),
		@TokenFilterDef(factory = SnowballPorterFilterFactory.class,
			params = { @Parameter(name = “language”, value = “English”) })
	}
)

thjanssen

CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery cq = cb.createQuery(Book.class);
Root root = cq.from(Book.class);

// call the database function calculate
ParameterExpression doubleParam1 = cb.parameter(Double.class);
ParameterExpression doubleParam2 = cb.parameter(Double.class);
cq.where(cb.greaterThan(doubleParam2, cb.function(“calculate”, Double.class, root.get(Book_.price), doubleParam1)));

TypedQuery q = em.createQuery(cq);