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();