+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2010, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors. All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA 02110-1301 USA
+ */
+package org.hibernate.tutorial.em;
+
+import java.util.Date;
+import java.util.List;
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.Persistence;
+
+import junit.framework.TestCase;
+
+/**
+ * Illustrates basic use of Hibernate as a JPA provider.
+ *
+ * @author Steve Ebersole
+ */
+public class EntityManagerIllustrationTest extends TestCase {
+ private EntityManagerFactory entityManagerFactory;
+
+ @Override
+ protected void setUp() throws Exception {
+ // like discussed with regards to SessionFactory, an EntityManagerFactory is set up once for an application
+ // IMPORTANT: notice how the name here matches the name we gave the persistence-unit in persistence.xml!
+ entityManagerFactory = Persistence.createEntityManagerFactory( "org.hibernate.tutorial.jpa" );
+ }
+
+ @Override
+ protected void tearDown() throws Exception {
+ entityManagerFactory.close();
+ }
+
+ public void testBasicUsage() {
+ // create a couple of events...
+ EntityManager entityManager = entityManagerFactory.createEntityManager();
+ entityManager.getTransaction().begin();
+ entityManager.persist( new Event( "Our very first event!", new Date() ) );
+ entityManager.persist( new Event( "A follow up event", new Date() ) );
+ entityManager.getTransaction().commit();
+ entityManager.close();
+
+ // now lets pull events from the database and list them
+ entityManager = entityManagerFactory.createEntityManager();
+ entityManager.getTransaction().begin();
+ List<Event> result = entityManager.createQuery( "from Event", Event.class ).getResultList();
+ for ( Event event : result ) {
+ System.out.println( "Event (" + event.getDate() + ") : " + event.getTitle() );
+ }
+ entityManager.getTransaction().commit();
+ entityManager.close();
+ }
+}