/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2011, 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.ejb.test.cascade;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import org.hibernate.ejb.test.BaseEntityManagerFunctionalTestCase;
import org.junit.Test;
/**
* @author Max Rydahl Andersen
*/
public class CascadeTest extends BaseEntityManagerFunctionalTestCase {
@Test
public void testCascade() throws Exception {
EntityManager em = getOrCreateEntityManager();
em.getTransaction().begin();
Teacher teacher = new Teacher();
Student student = new Student();
teacher.setFavoriteStudent(student);
student.setFavoriteTeacher(teacher);
teacher.getStudents().add(student);
student.setPrimaryTeacher(teacher);
em.persist( teacher );
em.getTransaction().commit();
em = getOrCreateEntityManager();
em.getTransaction().begin();
Teacher foundTeacher = (Teacher) em.createQuery( "select t from Teacher as t" ).getSingleResult();
System.out.println(foundTeacher);
System.out.println(foundTeacher.getFavoriteStudent());
for (Student fstudent : foundTeacher.getStudents()) {
System.out.println(fstudent);
System.out.println(fstudent.getFavoriteTeacher());
System.out.println(fstudent.getPrimaryTeacher());
}
em.getTransaction().commit(); // here *alot* of flushes occur on an object graph that has *Zero* changes.
em.close();
}
@Test
public void testNoCascadeAndMerge() throws Exception {
Song e1 = new Song();
Author e2 = new Author();
e1.setAuthor(e2);
EntityManager em = getOrCreateEntityManager();
EntityTransaction tx = em.getTransaction();
tx.begin();
em.persist(e2);
em.persist(e1);
tx.commit();
em.close();
em = getOrCreateEntityManager();
e1 = em.find(Song.class, e1.getId());
tx = em.getTransaction();
tx.begin();
em.merge(e1);
//em.refresh(e1);
tx.commit();
em.close();
}
@Override
public Class[] getAnnotatedClasses() {
return new Class[]{
Teacher.class,
Student.class,
Song.class,
Author.class
};
}
}