/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.jpa.test.cascade;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import org.junit.Test;
import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;
/**
* @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
};
}
}