| /* |
| * 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 org.apache.openjpa.jdbc.conf.JDBCConfiguration; |
| import org.apache.openjpa.jdbc.sql.DBDictionary; |
| import org.apache.openjpa.persistence.test.SQLListenerTestCase; |
| |
| /** |
| * Test that query pagination works properly. |
| */ |
| public class TestQueryPagination |
| extends SQLListenerTestCase { |
| |
| @Override |
| public void setUp() { |
| setUp(SimpleEntity.class, CLEAR_TABLES); |
| |
| EntityManager em = emf.createEntityManager(); |
| em.getTransaction().begin(); |
| em.persist(new SimpleEntity("foo", "bar" + 0)); |
| em.persist(new SimpleEntity("foo", "bar" + 1)); |
| em.persist(new SimpleEntity("foo", "bar" + 2)); |
| em.persist(new SimpleEntity("foo", "bar" + 3)); |
| em.persist(new SimpleEntity("foo", "bar" + 4)); |
| em.persist(new SimpleEntity("foo", "bar" + 5)); |
| em.getTransaction().commit(); |
| em.close(); |
| } |
| |
| public void testFirstThenMax() { |
| helper(true, 2, 3, 3); |
| } |
| |
| public void testMaxThenFirst() { |
| helper(false, 2, 3, 3); |
| } |
| |
| public void testNoResultsFirstFirst() { |
| helper(true, 10, 3, 0); |
| } |
| |
| public void testNoResultsFirstLast() { |
| helper(false, 10, 3, 0); |
| } |
| |
| public void testAllResultsFirstFirst() { |
| helper(true, 0, 10, 6); |
| } |
| |
| public void testAllResultsFirstLast() { |
| helper(false, 0, 10, 6); |
| } |
| |
| private void helper(boolean firstFirst, int first, int max, int expected) { |
| EntityManager em = emf.createEntityManager(); |
| Query q = em.createQuery("select e from simple e order by e.value"); |
| sql.clear(); |
| List<SimpleEntity> fullList = q.getResultList(); |
| if (firstFirst) |
| q.setFirstResult(first).setMaxResults(max); |
| else |
| q.setMaxResults(max).setFirstResult(first); |
| List<SimpleEntity> list = q.getResultList(); |
| checkSQL(); |
| assertEquals(expected, list.size()); |
| for (int i = 0; i < list.size(); i++) { |
| assertEquals("bar" + (first + i), list.get(i).getValue()); |
| } |
| em.close(); |
| } |
| |
| private void checkSQL() { |
| assertEquals(2, sql.size()); |
| String noRange = this.sql.get(0); |
| String withRange = this.sql.get(1); |
| DBDictionary dict = ((JDBCConfiguration) emf.getConfiguration()) |
| .getDBDictionaryInstance(); |
| if (dict.supportsSelectStartIndex || dict.supportsSelectEndIndex) |
| assertNotEquals(noRange, withRange); |
| else |
| assertEquals(noRange, withRange); |
| } |
| } |