Added test examples for the article "Hibernate: save, persist, update, merge, saveOrUpdate" (#487)
This commit is contained in:
Sergey Petunin
Grzegorz Piwowarek
parent
afb2e977fb
commit
d0e35e7022
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@ -9,6 +9,7 @@
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- [Sorting with Hibernate](http://www.baeldung.com/hibernate-sort)
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- [Auditing with JPA, Hibernate, and Spring Data JPA](http://www.baeldung.com/database-auditing-jpa)
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- [Stored Procedures with Hibernate](http://www.baeldung.com/stored-procedures-with-hibernate-tutorial)
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- [Hibernate: save, persist, update, merge, saveOrUpdate](http://www.baeldung.com/hibernate-save-persist-update-merge-saveorupdate/)
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### Quick Start
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@ -149,6 +149,13 @@
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.hsqldb</groupId>
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<artifactId>hsqldb</artifactId>
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<version>2.3.4</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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@ -0,0 +1,31 @@
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package com.baeldung.persistence.model;
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import javax.persistence.Entity;
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import javax.persistence.GeneratedValue;
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import javax.persistence.Id;
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@Entity
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public class Person {
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@Id
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@GeneratedValue
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private Long id;
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private String name;
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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}
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@ -0,0 +1,272 @@
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package com.baeldung.persistence.save;
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import com.baeldung.persistence.model.Person;
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import org.hibernate.HibernateException;
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import org.hibernate.Session;
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import org.hibernate.SessionFactory;
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import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
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import org.hibernate.cfg.Configuration;
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import org.hibernate.dialect.HSQLDialect;
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import org.hibernate.service.ServiceRegistry;
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import org.junit.*;
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import static org.junit.Assert.*;
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/**
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* Testing specific implementation details for different methods:
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* persist, save, merge, update, saveOrUpdate.
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*/
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public class SaveMethodsTest {
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private static SessionFactory sessionFactory;
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private Session session;
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@BeforeClass
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public static void beforeTests() {
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Configuration configuration = new Configuration()
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.addAnnotatedClass(Person.class)
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.setProperty("hibernate.dialect", HSQLDialect.class.getName())
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.setProperty("hibernate.connection.driver_class", org.hsqldb.jdbcDriver.class.getName())
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.setProperty("hibernate.connection.url", "jdbc:hsqldb:mem:test")
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.setProperty("hibernate.connection.username", "sa")
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.setProperty("hibernate.connection.password", "")
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.setProperty("hibernate.hbm2ddl.auto", "update");
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ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(
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configuration.getProperties()).build();
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sessionFactory = configuration.buildSessionFactory(serviceRegistry);
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}
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@Before
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public void setUp() {
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session = sessionFactory.openSession();
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session.beginTransaction();
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}
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@Test
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public void whenPersistTransient_thenSavedToDatabaseOnCommit() {
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Person person = new Person();
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person.setName("John");
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session.persist(person);
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session.getTransaction().commit();
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session.close();
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session = sessionFactory.openSession();
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session.beginTransaction();
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assertNotNull(session.get(Person.class, person.getId()));
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}
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@Test
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public void whenPersistPersistent_thenNothingHappens() {
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Person person = new Person();
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person.setName("John");
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session.persist(person);
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Long id1 = person.getId();
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session.persist(person);
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Long id2 = person.getId();
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assertEquals(id1, id2);
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}
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@Test(expected = HibernateException.class)
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public void whenPersistDetached_thenThrowsException() {
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Person person = new Person();
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person.setName("John");
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session.persist(person);
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session.evict(person);
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session.persist(person);
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}
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@Test
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public void whenSaveTransient_thenIdGeneratedImmediately() {
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Person person = new Person();
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person.setName("John");
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assertNull(person.getId());
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Long id = (Long) session.save(person);
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assertNotNull(id);
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session.getTransaction().commit();
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session.close();
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assertEquals(id, person.getId());
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session = sessionFactory.openSession();
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session.beginTransaction();
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assertNotNull(session.get(Person.class, person.getId()));
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}
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@Test
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public void whenSavePersistent_thenNothingHappens() {
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Person person = new Person();
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person.setName("John");
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Long id1 = (Long) session.save(person);
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Long id2 = (Long) session.save(person);
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assertEquals(id1, id2);
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}
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@Test
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public void whenSaveDetached_thenNewInstancePersisted() {
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Person person = new Person();
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person.setName("John");
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Long id1 = (Long) session.save(person);
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session.evict(person);
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Long id2 = (Long) session.save(person);
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assertNotEquals(id1, id2);
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}
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@Test
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public void whenMergeDetached_thenEntityUpdatedFromDatabase() {
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Person person = new Person();
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person.setName("John");
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session.save(person);
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session.evict(person);
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person.setName("Mary");
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Person mergedPerson = (Person) session.merge(person);
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assertNotSame(person, mergedPerson);
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assertEquals("Mary", mergedPerson.getName());
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}
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@Test
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public void whenMergeTransient_thenNewEntitySavedToDatabase() {
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Person person = new Person();
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person.setName("John");
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Person mergedPerson = (Person) session.merge(person);
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session.getTransaction().commit();
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session.beginTransaction();
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assertNull(person.getId());
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assertNotNull(mergedPerson.getId());
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}
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@Test
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public void whenMergePersistent_thenReturnsSameObject() {
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Person person = new Person();
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person.setName("John");
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session.save(person);
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Person mergedPerson = (Person) session.merge(person);
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assertSame(person, mergedPerson);
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}
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@Test
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public void whenUpdateDetached_thenEntityUpdatedFromDatabase() {
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Person person = new Person();
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person.setName("John");
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session.save(person);
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session.evict(person);
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person.setName("Mary");
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session.update(person);
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assertEquals("Mary", person.getName());
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}
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@Test(expected = HibernateException.class)
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public void whenUpdateTransient_thenThrowsException() {
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Person person = new Person();
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person.setName("John");
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session.update(person);
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}
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@Test
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public void whenUpdatePersistent_thenNothingHappens() {
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Person person = new Person();
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person.setName("John");
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session.save(person);
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session.update(person);
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}
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@Test
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public void whenSaveOrUpdateDetached_thenEntityUpdatedFromDatabase() {
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Person person = new Person();
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person.setName("John");
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session.save(person);
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session.evict(person);
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person.setName("Mary");
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session.saveOrUpdate(person);
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assertEquals("Mary", person.getName());
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}
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@Test
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public void whenSaveOrUpdateTransient_thenSavedToDatabaseOnCommit() {
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Person person = new Person();
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person.setName("John");
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session.saveOrUpdate(person);
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session.getTransaction().commit();
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session.close();
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session = sessionFactory.openSession();
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session.beginTransaction();
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assertNotNull(session.get(Person.class, person.getId()));
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}
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@Test
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public void whenSaveOrUpdatePersistent_thenNothingHappens() {
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Person person = new Person();
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person.setName("John");
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session.save(person);
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session.saveOrUpdate(person);
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}
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@After
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public void tearDown() {
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session.getTransaction().commit();
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session.close();
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}
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@AfterClass
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public static void afterTests() {
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sessionFactory.close();
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}
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}
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