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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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package org.apache.openjpa.persistence.discriminator.fetch;
import java.util.HashSet;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import org.apache.openjpa.persistence.test.AbstractPersistenceTestCase;
public class TestLazyFetch extends AbstractPersistenceTestCase {
private static int N_EMPS = 3;
public EntityManagerFactory newEmf() {
EntityManagerFactory emf = createEMF(Person.class, Employee.class, Manager.class);
assertNotNull("Unable to create EntityManagerFactory", emf);
return emf;
}
@Override
public void setUp() throws Exception {
EntityManagerFactory emf = newEmf();
EntityManager em = emf.createEntityManager();
EntityTransaction tran = em.getTransaction();
// cleanup from previous execution
tran.begin();
em.createQuery("Delete from D_F_Manager").executeUpdate();
em.createQuery("Delete from D_F_Employee").executeUpdate();
tran.commit();
// populate a small graph.
tran.begin();
Manager m = new Manager();
m.setId(10);
m.setEmployees(new HashSet<Employee>());
em.persist(m);
Employee e;
for (int i = 0; i < N_EMPS; i++) {
e = new Employee();
e.setId(i + 1);
e.setManager(m);
m.getEmployees().add(e);
em.persist(e);
}
tran.commit();
em.close();
emf.close();
}
@SuppressWarnings("unchecked")
public void testFetchOneSideFirst() {
EntityManagerFactory emf = newEmf();
EntityManager em = emf.createEntityManager();
List<Manager> managers = em.createQuery("Select m from D_F_Manager m").getResultList();
assertEquals(1, managers.size());
Manager m = managers.get(0);
List<Employee> emps = em.createQuery("Select e from D_F_Employee e").getResultList();
assertEquals(N_EMPS, emps.size());
for(Employee e : emps) {
assertNotNull(e.getManager());
assertTrue(m.getEmployees().contains(e));
assertEquals(m, e.getManager());
}
closeEM(em);
closeEMF(emf);
}
@SuppressWarnings("unchecked")
public void testFetchManySideFirst() {
EntityManagerFactory emf = newEmf();
EntityManager em = emf.createEntityManager();
List<Employee> emps = em.createQuery("Select e from D_F_Employee e").getResultList();
assertEquals(N_EMPS, emps.size());
List<Manager> managers = em.createQuery("Select m from D_F_Manager m").getResultList();
assertEquals(1, managers.size());
Manager m = managers.get(0);
for(Employee e : emps) {
assertNotNull(e.getManager());
assertTrue(m.getEmployees().contains(e));
assertEquals(m, e.getManager());
}
closeEM(em);
closeEMF(emf);
}
}