首先创建\META-INF\persistence.xml配置文件并做简单的配置

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
             version="2.0">
​
    <persistence-unit name="org.hibernate.tutorial.em">
        <description>
            Persistence unit for the JPA tutorial of the Hibernate Getting Started Guide
        </description>
​
        <properties>
            <property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver" />
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/databaseName?useSSL=false&amp;serverTimezone=UTC&amp;verifyServerCertifate=false&amp;allowPublicKeyRetrieval=true" />
            <property name="javax.persistence.jdbc.user" value="root" />
            <property name="javax.persistence.jdbc.password" value="passwd" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL8Dialect"/>
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.format_sql" value="true"/>
            <property name="hibernate.hbm2ddl.auto" value="create" />
        </properties>
​
    </persistence-unit>
​
</persistence>

创建实体Java类

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;
​
@Entity
@Table( name = "EVENTS" )
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;
    }
}

向META-INF/persistence.xml文件中添加映射信息

<class>类路径.Event</class>

JUnit测试测试程序

import java.util.Date;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
​
import junit.framework.TestCase;
​
/**
 * Illustrates basic use of Hibernate as a JPA provider.
 *
 * @author Steve Ebersole
 */
public class EntityManagerIllustrationTest 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.em" );
    }
​
    @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();
    }
}

运行测试