Hibernate5 Guide

(1) 创建Maven工程

可以使用Eclipse或IDEA创建

(2) 修改pom文件

 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.hibernate5guide</groupId>
     <artifactId>hibernate5guide</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <dependencies>
         <dependency>
             <groupId>org.hibernate</groupId>
             <artifactId>hibernate-core</artifactId>
             <version>5.2.12.Final</version>
         </dependency>
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
             <version>5.1.44</version>
         </dependency>
     </dependencies>
     <build>
         <pluginManagement>
             <plugins>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
                     <configuration>
                         <source>${java-version}</source>
                         <target>${java-version}</target>
                     </configuration>
                 </plugin>
             </plugins>
         </pluginManagement>
     </build>
     <properties>
         <java-version>1.8</java-version>
     </properties>
 </project>

(3) 添加hibernate.cfg.xml文件

 <?xml version='1.0' encoding='UTF-8'?>
 <!DOCTYPE hibernate-configuration PUBLIC
           "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
           "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 <hibernate-configuration>
     <session-factory>
         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
         <property name="connection.url">jdbc:mysql://localhost:3306/test</property>
         <property name="connection.username">xxx</property>
         <property name="connection.password">xxx</property>
         <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
         <property name="show_sql">true</property>
         <property name="hbm2ddl.auto">update</property>
         <mapping class="hibernate5guide.entity.TestEvent" />
     </session-factory>
 </hibernate-configuration>

(4) 创建SessionFactoryBuilder拿到单例的SessionFactory

 package hibernate5guide.util;

 import org.hibernate.SessionFactory;
 import org.hibernate.boot.MetadataSources;
 import org.hibernate.boot.registry.StandardServiceRegistry;
 import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

 /**
  * An example to obtain the org.hibernate.SessionFactory.<br>
  * One benefit of this approach is JUnit test.<br>
  */
 public class SessionFactoryBuilder {

     private static SessionFactory instance;

     private SessionFactoryBuilder() {
     }

     public static synchronized SessionFactory getInstance() {
         return instance == null ? setUpSessionFactory() : instance;
     }

     private static SessionFactory setUpSessionFactory() {
         // A SessionFactory is set up once for an application!
         // configures settings from hibernate.cfg.xml
         final StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure().build();
         try {
             instance = new MetadataSources(registry).buildMetadata().buildSessionFactory();
         } catch (Exception e) {
             // The registry would be destroyed by the SessionFactory, but we had
             // trouble building the SessionFactory, so destroy it manually.
             StandardServiceRegistryBuilder.destroy(registry);
         }

         return instance;
     }
 }

(5) 创建实体类

 package hibernate5guide.entity;

 import java.io.Serializable;
 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 = "test_event")
 public class TestEvent implements Serializable {

     private static final long serialVersionUID = 1L;

     @Id
     @Column(name = "event_id")
     @GeneratedValue(generator = "increment")
     @GenericGenerator(name = "increment", strategy = "increment")
     private Long eventId;

     @Column(name = "event_title")
     private String eventTitle;

     @Column(name = "event_date")
     @Temporal(TemporalType.TIMESTAMP)
     private Date eventDate;

     // a default constructor for entity must exist
     public TestEvent() {
     }

     public TestEvent(String eventTitle, Date eventDate) {
         this.eventTitle = eventTitle;
         this.eventDate = eventDate;
     }

     public TestEvent(Long eventId, String eventTitle, Date eventDate) {
         this.eventId = eventId;
         this.eventTitle = eventTitle;
         this.eventDate = eventDate;
     }

     public Long getEventId() {
         return eventId;
     }

     public void setEventId(Long eventId) {
         this.eventId = eventId;
     }

     public String getEventTitle() {
         return eventTitle;
     }

     public void setEventTitle(String eventTitle) {
         this.eventTitle = eventTitle;
     }

     public Date getEventDate() {
         return eventDate;
     }

     public void setEventDate(Date eventDate) {
         this.eventDate = eventDate;
     }

     @Override
     public String toString() {
         return "TestEvent [eventId=" + eventId + ", eventTitle=" + eventTitle + ", eventDate=" + eventDate + "]";
     }
 }

(6) 添加和查询测试

INSERT

 Session session = getSessionFactory().openSession();
 session.beginTransaction();
 session.save(new TestEvent("first event!", new Date()));
 session.save(new TestEvent("Second event!", new Date()));
 session.getTransaction().commit();
 session.close();

SELECT

 Session session = getSessionFactory().openSession();
 session.beginTransaction();
 List<TestEvent> result = session.createQuery("from TestEvent").list();
 session.getTransaction().commit();
 session.close();