建立實體Java類

import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
​
import org.hibernate.annotations.GenericGenerator;
import org.hibernate.envers.Audited;
​
@Entity
@Table( name = "EVENTS" )
@Audited  // <--- this tell Envers to audit (track changes to) this entity
public class Event {
    private Long id;
​
    private String title;
    private Date date;
​
 public Event() {
  // this form used by Hibernate
 }
​
 public Event(String title, Date date) {
  // for application use, to create new events
  this.title = title;
  this.date = date;
 }
​
 @Id
 @GeneratedValue(generator="increment")
 @GenericGenerator(name="increment", strategy = "increment")
    public Long getId() {
  return id;
   }
​
    private void setId(Long id) {
  this.id = id;
   }
​
 @Temporal(TemporalType.TIMESTAMP)
 @Column(name = "EVENT_DATE")
    public Date getDate() {
  return date;
   }
​
    public void setDate(Date date) {
  this.date = date;   }​    public String getTitle() { return title;   }​    public void setTitle(String title) { this.title = title;   }​ @Override public int hashCode() { int result = title.hashCode(); result = 31 * result + date.hashCode(); return result; }}
 

向META-INF/persistence.xml檔案中新增對映資訊

<class>類路徑.Event</class>

JUnit測試測試程式

import java.util.Date;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
​
import junit.framework.TestCase;
​
import org.hibernate.envers.AuditReader;
import org.hibernate.envers.AuditReaderFactory;
​
/**
 * Illustrates the set up and use of Envers.
 * <p>
 * This example is different from the others in that we really need to save multiple revisions to the entity in
 * order to get a good look at Envers in action.
 *
 * @author Steve Ebersole
 */
public class EnversIllustrationTest extends TestCase {
 private EntityManagerFactory entityManagerFactory;
​
 @Override
 protected void setUp() throws Exception {
  // like discussed with regards to SessionFactory, an EntityManagerFactory is set up once for an application
  //   IMPORTANT: notice how the name here matches the name we gave the persistence-unit in persistence.xml!
  entityManagerFactory = Persistence.createEntityManagerFactory( "org.hibernate.tutorial.envers" );
 }
​
 @Override
 protected void tearDown() throws Exception {
  entityManagerFactory.close();
 }
​
 public void testBasicUsage() {
  // create a couple of events
  EntityManager entityManager = entityManagerFactory.createEntityManager();
  entityManager.getTransaction().begin();
  entityManager.persist( new Event( "Our very first event!", new Date() ) );
  entityManager.persist( new Event( "A follow up event", new Date() ) );
  entityManager.getTransaction().commit();
  entityManager.close();
​
  // now lets pull events from the database and list them
  entityManager = entityManagerFactory.createEntityManager();
  entityManager.getTransaction().begin();
        List<Event> result = entityManager.createQuery( "from Event", Event.class ).getResultList(); for ( Event event : result ) { System.out.println( "Event (" + event.getDate() + ") : " + event.getTitle() ); }        entityManager.getTransaction().commit();        entityManager.close();​ // so far the code is the same as we have seen in previous tutorials. Now lets leverage Envers...​ // first lets create some revisions entityManager = entityManagerFactory.createEntityManager(); entityManager.getTransaction().begin(); Event myEvent = entityManager.find( Event.class, 2L ); // we are using the increment generator, so we know 2 is a valid id myEvent.setDate( new Date() ); myEvent.setTitle( myEvent.getTitle() + " (rescheduled)" );        entityManager.getTransaction().commit();        entityManager.close();​ // and then use an AuditReader to look back through history entityManager = entityManagerFactory.createEntityManager(); entityManager.getTransaction().begin(); myEvent = entityManager.find( Event.class, 2L ); assertEquals( "A follow up event (rescheduled)", myEvent.getTitle() ); AuditReader reader = AuditReaderFactory.get( entityManager ); Event firstRevision = reader.find( Event.class, 2L, 1 ); assertFalse( firstRevision.getTitle().equals( myEvent.getTitle() ) ); assertFalse( firstRevision.getDate().equals( myEvent.getDate() ) ); Event secondRevision = reader.find( Event.class, 2L, 2 ); assertTrue( secondRevision.getTitle().equals( myEvent.getTitle() ) ); assertTrue( secondRevision.getDate().equals( myEvent.getDate() ) ); entityManager.getTransaction().commit();        entityManager.close(); }}
 

執行測試

Hibernate: 
十一月 01, 2018 2:59:17 下午 org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl getIsolatedConnection
INFO: HHH10001501: Connection obtained from JdbcConnectionAccess [org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess@1761fc10] for (non-JTA) DDL execution was not in auto-commit mode; the Connection 'local transaction' will be committed and the Connection will be set into auto-commit mode.
    
    drop table if exists EVENTS
Hibernate: 
    
    create table EVENTS (
       id bigint not null,
        EVENT_DATE datetime(6),
        title varchar(255),
        primary key (id)
   ) engine=InnoDB
十一月 01, 2018 2:59:17 下午 org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl getIsolatedConnection
INFO: HHH10001501: Connection obtained from JdbcConnectionAccess [org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess@1379327f] for (non-JTA) DDL execution was not in auto-commit mode; the Connection 'local transaction' will be committed and the Connection will be set into auto-commit mode.
十一月 01, 2018 2:59:18 下午 org.hibernate.tool.schema.internal.SchemaCreatorImpl applyImportSources
INFO: HHH000476: Executing import script 'org.hiber[email protected]7de51c1f'
Hibernate: 
    select
        max(id) 
    from
        EVENTS
Hibernate: 
    insert    into        EVENTS       (EVENT_DATE, title, id)    values       (?, ?, ?)Hibernate:    insert    into        EVENTS       (EVENT_DATE, title, id)    values       (?, ?, ?)十一月 01, 2018 2:59:18 下午 org.hibernate.hql.internal.QueryTranslatorFactoryInitiator initiateServiceINFO: HHH000397: Using ASTQueryTranslatorFactoryHibernate:    select        event0_.id as id1_0_,        event0_.EVENT_DATE as EVENT_DA2_0_,        event0_.title as title3_0_    from        EVENTS event0_Event (2018-11-01 14:59:18.261) : Our very first event!Event (2018-11-01 14:59:18.292) : A follow up event​十一月 01, 2018 2:59:18 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop