openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/persistence/query/TestQueryIdOfRelationDoesNotJoin.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * 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
 * under the License.    
 */
package org.apache.openjpa.persistence.query;

import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.Query;

import junit.textui.TestRunner;
import org.apache.openjpa.persistence.test.SingleEMFTestCase;

/**
 * Test that querying the id of a related many-one (or one-one) does not create
 * a join across the tables.
 *
 * @author Abe White
 */
public class TestQueryIdOfRelationDoesNotJoin
    extends SingleEMFTestCase {

    private long e3Id;

    public void setUp() {
        setUp(ManyOneEntity.class, ManyOneEntitySub.class);

        ManyOneEntity e1 = new ManyOneEntity();
        e1.setName("e1");
        ManyOneEntity e2 = new ManyOneEntity();
        e2.setName("e2");
        ManyOneEntity e3 = new ManyOneEntity();
        e3.setName("e3");
        e1.setRel(e3);
        e2.setRel(e1);

        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        em.persist(e1);
        em.getTransaction().commit();
        e3Id = e3.getId();

        // we intentionally create an orphaned reference on e1.rel
        em.getTransaction().begin();
        em.remove(e3);
        em.getTransaction().commit();
        em.close();
    }

    public void testQuery() {
        EntityManager em = emf.createEntityManager();
        Query q = em.createQuery("select e from ManyOneEntity e "
            + "where e.rel.id = :id").setParameter("id", e3Id);
        List res = q.getResultList();
        assertEquals(1, res.size());

        ManyOneEntity e = (ManyOneEntity) res.get(0);
        assertEquals("e1", e.getName());
        assertNull(e.getRel());
        em.close();
    }

    public static void main(String[] args) {
        TestRunner.run(TestQueryIdOfRelationDoesNotJoin.class);
    }
}