/*
* 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.test.pagination;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import org.junit.Test;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.dialect.SQLServerDialect;
import org.hibernate.testing.TestForIssue;
import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
import static org.junit.Assert.assertFalse;
/**
* HHH-5715 bug test case: Duplicated entries when using select distinct with join and pagination. The bug has to do
* with new {@link SQLServerDialect} that uses row_number function for pagination
*
* @author Valotasios Yoryos
*/
@TestForIssue( jiraKey = "HHH-5715" )
public class DistinctSelectTest extends BaseCoreFunctionalTestCase {
private static final int NUM_OF_USERS = 30;
@Override
public String[] getMappings() {
return new String[] { "pagination/EntryTag.hbm.xml" };
}
public void feedDatabase() {
List<Tag> tags = new ArrayList<Tag>();
Session s = openSession();
Transaction t = s.beginTransaction();
for (int i = 0; i < 5; i++) {
Tag tag = new Tag("Tag: " + UUID.randomUUID().toString());
tags.add(tag);
s.save(tag);
}
for (int i = 0; i < NUM_OF_USERS; i++) {
Entry e = new Entry("Entry: " + UUID.randomUUID().toString());
e.getTags().addAll(tags);
s.save(e);
}
t.commit();
s.close();
}
@SuppressWarnings( {"unchecked"})
@Test
public void testDistinctSelectWithJoin() {
feedDatabase();
Session s = openSession();
List<Entry> entries = s.createQuery("select distinct e from Entry e join e.tags t where t.surrogate != null order by e.name").setFirstResult(10).setMaxResults(5).list();
// System.out.println(entries);
Entry firstEntry = entries.remove(0);
assertFalse("The list of entries should not contain dublicated Entry objects as we've done a distinct select", entries.contains(firstEntry));
s.close();
}
}