| /* |
| * 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.distinctjoin; |
| |
| import java.sql.SQLException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import javax.persistence.EntityManager; |
| import javax.persistence.EntityTransaction; |
| import javax.persistence.Query; |
| |
| import org.apache.openjpa.lib.jdbc.JDBCListener; |
| import org.apache.openjpa.lib.log.Log; |
| import org.apache.openjpa.persistence.OpenJPAEntityManagerFactorySPI; |
| import org.apache.openjpa.persistence.test.AbstractPersistenceTestCase; |
| import org.apache.openjpa.persistence.test.FilteringJDBCListener; |
| |
| |
| /** |
| * This test case demonstrates that we currently do way too much sub selects |
| * if @Embedded fields with a @Lob are involved. |
| * |
| * For running the test you can use the following commandline in |
| * openjpa-persistence-jdbc: |
| * |
| */ |
| public class TestDistinctJoin extends AbstractPersistenceTestCase { |
| |
| protected List<String> sql = new ArrayList<>(); |
| |
| private Log log; |
| |
| @Override |
| public void setUp() throws SQLException { |
| OpenJPAEntityManagerFactorySPI emf = createEMF(); |
| |
| log = emf.getConfiguration().getLog("Tests"); |
| |
| emf.close(); |
| } |
| |
| /** |
| * Gets the number of SQL issued since last reset. |
| */ |
| public int getSQLCount() { |
| return sql.size(); |
| } |
| |
| /** |
| * Resets SQL count. |
| * @return number of SQL counted since last reset. |
| */ |
| public int resetSQL() { |
| int tmp = sql.size(); |
| sql.clear(); |
| return tmp; |
| } |
| |
| public void testJoinOnly() throws SQLException { |
| |
| log.error("THIS TEST IS CURRENTLY DISABLED!"); |
| if (true) return; |
| |
| |
| OpenJPAEntityManagerFactorySPI emf = |
| createEMF(Course.class, Lecturer.class, LocalizedText.class, |
| "openjpa.jdbc.SchemaFactory", "native", |
| "openjpa.jdbc.SynchronizeMappings", "buildSchema(ForeignKeys=true)", |
| "openjpa.jdbc.QuerySQLCache", "false", |
| "openjpa.DataCache", "false", |
| "openjpa.jdbc.JDBCListeners", new JDBCListener[] { new FilteringJDBCListener(sql) } |
| ); |
| |
| Long id; |
| |
| { |
| EntityManager em = emf.createEntityManager(); |
| EntityTransaction tran = em.getTransaction(); |
| tran.begin(); |
| em.createQuery("DELETE from Lecturer as l").executeUpdate(); |
| em.createQuery("DELETE from Course as c").executeUpdate(); |
| tran.commit(); |
| em.close(); |
| |
| } |
| |
| { |
| EntityManager em = emf.createEntityManager(); |
| EntityTransaction tran = em.getTransaction(); |
| tran.begin(); |
| |
| Course course = new Course(); |
| LocalizedText objective = new LocalizedText(); |
| objective.setTextDe("de-objective"); |
| objective.setTextEn("en-objective"); |
| course.setObjective(objective); |
| |
| LocalizedText title = new LocalizedText(); |
| title.setTextDe("title-de"); |
| title.setTextEn("title-en"); |
| course.setObjective(title); |
| |
| course.setLobColumn("oh this could be a very looooong text..."); |
| course.setCourseNumber("4711"); |
| |
| em.persist(course); |
| |
| Lecturer l1 = new Lecturer(); |
| l1.setCourse(course); |
| course.addLecturer(l1); |
| |
| id = course.getId(); |
| tran.commit(); |
| em.close(); |
| } |
| |
| { |
| EntityManager em = emf.createEntityManager(); |
| Course course = em.find(Course.class, id); |
| assertNotNull(course); |
| |
| em.close(); |
| } |
| |
| String msg; |
| |
| { |
| msg = "Distinct and Join"; |
| log.info("\n\n" + msg); // this one does sub-selects for LocalizedString and changeLog |
| EntityManager em = emf.createEntityManager(); |
| EntityTransaction tran = em.getTransaction(); |
| tran.begin(); |
| resetSQL(); |
| |
| Query q = em.createQuery("select distinct c from Course c join c.lecturers l "); |
| List<Course> courses = q.getResultList(); |
| assertFalse(courses.isEmpty()); |
| assertNotNull(courses.get(0)); |
| assertMaxQueries(msg, 2); |
| |
| tran.commit(); |
| em.close(); |
| } |
| |
| { |
| msg = "Distinct"; // creates NO sub-query! |
| log.info("\n\n" + msg); |
| EntityManager em = emf.createEntityManager(); |
| |
| Query q = em.createQuery("select distinct c from Course c"); |
| List<Course> courses = q.getResultList(); |
| assertFalse(courses.isEmpty()); |
| assertNotNull(courses.get(0)); |
| assertMaxQueries(msg, 2); |
| |
| em.close(); |
| } |
| |
| { |
| msg = "Join"; // creates NO sub-query! |
| log.info("\n\n" + msg); |
| EntityManager em = emf.createEntityManager(); |
| |
| Query q = em.createQuery("select c from Course c join c.lecturers l "); |
| List<Course> courses = q.getResultList(); |
| assertFalse(courses.isEmpty()); |
| assertNotNull(courses.get(0)); |
| assertMaxQueries(msg, 2); |
| |
| em.close(); |
| } |
| |
| { |
| msg = "Distinct inverse join"; // this one does sub-selects for LocalizedString and changeLog |
| log.info("\n\n" + msg); |
| EntityManager em = emf.createEntityManager(); |
| |
| Query q = em.createQuery("select distinct c from Lecturer l join l.course c"); |
| List<Course> courses = q.getResultList(); |
| assertFalse(courses.isEmpty()); |
| assertNotNull(courses.get(0)); |
| assertMaxQueries(msg, 2); |
| |
| em.close(); |
| } |
| |
| { |
| msg = "Inverse join"; // this one does sub-selects for LocalizedString and changeLog |
| log.info("\n\n" + msg); |
| EntityManager em = emf.createEntityManager(); |
| |
| Query q = em.createQuery("select c from Lecturer l join l.course c"); |
| List<Course> courses = q.getResultList(); |
| assertFalse(courses.isEmpty()); |
| assertNotNull(courses.get(0)); |
| assertMaxQueries(msg, 2); |
| |
| em.close(); |
| } |
| |
| |
| emf.close(); |
| } |
| |
| private void assertMaxQueries(String msg, int queriesAllowed) { |
| int queryCount = getSQLCount(); |
| if (queryCount > queriesAllowed) { |
| StringBuilder sb = new StringBuilder("The following queries got executed\n"); |
| for (String query : sql) { |
| sb.append(query).append('\n'); |
| } |
| log.error(sb.toString()); |
| |
| fail("got too many queries executed(" + queryCount + ") but only " + queriesAllowed+ " expected in " + msg); |
| } |
| resetSQL(); |
| } |
| } |