HelloHibernate

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根据官方文档写出的HelloWorld。

有xml和注解两种方式。这里，只写出官方的XML形式，详细请看我的工程

目录结构：

1。导包

2. hibernate总配置文件hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>

<!DOCTYPE hibernate-configuration PUBLIC

        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

<session-factory>

<!-- Database connection settings -->

<property name="connection.driver_class">com.mysql.jdbc.Driver</property>

<property name="connection.url">jdbc:mysql://localhost:3306/hib</property>

<property name="connection.username">root</property>

<property name="connection.password">1234</property>

<!-- JDBC connection pool (use the built-in) -->

<property name="connection.pool_size">1</property>

<!-- SQL dialect -->

<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

<!-- Enable Hibernate's automatic session context management -->

<property name="current_session_context_class">thread</property>

<!-- Disable the second-level cache  -->

<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

<!-- Echo all executed SQL to stdout -->

<property name="show_sql">true</property>

<!-- Drop and re-create the database schema on startup -->

<property name="hbm2ddl.auto">update</property>

<mapping resource="com/hibernate/po/Event.hbm.xml" />

<mapping class="com.hibernate.po.Person" /> 

</session-factory>

</hibernate-configuration>

3。 创建po类

import java.util.Date;

public class Event {

    private Long id;

    private String title;

    private Date date;

……省略getters 和 setters

｝

4。po类的配置文件Event.hbm.xml

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC

        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.hibernate.po">

<class name="com.hibernate.po.Event" table="EVENTS">

<id name="id" column="EVENT_ID">

<generator class="native" />

</id>

<property name="date" type="timestamp" column="EVENT_DATE" />

<property name="title" />

</class>

</hibernate-mapping>

5。Hibernate工具类HibernateUtil.java

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

public class HibernateUtil {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {

        try {

            // Create the SessionFactory from hibernate.cfg.xml

            return new Configuration().configure().buildSessionFactory();

        }

        catch (Throwable ex) {

            // Make sure you log the exception, as it might be swallowed

            System.err.println("Initial SessionFactory creation failed." + ex);

            throw new ExceptionInInitializerError(ex);

        }

    }

    public static SessionFactory getSessionFactory() {

        return sessionFactory;

    }

}

6。测试类

/**

 * 官方例子

 * @author  Administrator

 *

 */

public class EventManager {

    public static void main(String[] args) {

        EventManager mgr = new EventManager();

        if (true) {

            mgr.createAndStoreEvent("My Event", new Date());

        }

        HibernateUtil.getSessionFactory().close();

    }

    private void createAndStoreEvent(String title, Date theDate) {

        Session session = HibernateUtil.getSessionFactory().getCurrentSession();

        session.beginTransaction();

        Event theEvent = new Event();

        theEvent.setTitle(title);

        theEvent.setDate(theDate);

        session.save(theEvent);

        session.getTransaction().commit();

    }

}

转载于:https://my.oschina.net/u/1379006/blog/189477