maven构建hibernate入门使用（1）

1：创建maven工程，引入hibernate需要的依赖

<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-core</artifactId>
			<version>3.6.5.Final</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>1.6.1</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.6</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-nop</artifactId>
			<version>1.6.4</version>
		</dependency>

		<!-- 添加javassist -->
		<dependency>
			<groupId>javassist</groupId>
			<artifactId>javassist</artifactId>
			<version>3.11.0.GA</version>
		</dependency>
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.16</version>
		</dependency>

2：持久化一个类

package com.nerd.entity;

import java.util.Date;

public class Event {
	private int id;
	private Date date;
	private String title;
	public Date getDate() {
		return date;
	}
	public int getId() {
		return id;
	}
	public String getTitle() {
		return title;
	}
	public void setDate(Date date) {
		this.date = date;
	}
	public void setId(int id) {
		this.id = id;
	}
	public void setTitle(String title) {
		this.title = title;
	}
}

3:hibernate需要怎么去存储和加载持久化类的对象，这时我们要搞一个映射文件（该文件和实体类放在同一目录下面）

<?xml version="1.0" encoding='UTF-8'?> 

<!DOCTYPE hibernate-mapping PUBLIC
 "-//Hibernate/Hibernate Mapping DTD 3.0//EN"  "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping>
	<class name="com.nerd.entity.Event" table="events">
		<id name="id" type="int" column="EVENT_ID">
			<generator class="native" />
		</id>
		<property name="date" type="timestamp" column="EVENT_DATE" />
		<property name="title" />

	</class>
</hibernate-mapping>

4：hibernate配置（放在resource目录下面）

<?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://127.0.0.1:3306/db_hibe?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&transformedBitIsBoolean=true</property>
		<property name="connection.username">root</property>
		<property name="connection.password">1234</property>
		<property name="javax.persistence.validation.mode">none</property> 

		<property name="connection.pool_size">1</property>
        <property name="dialect">org.hibernate.dialect.SQLServerDialect</property>

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

		<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
        <property name="show_sql">true</property>
       <!--  <property name="format_sql">true</property> -->
		<property name="hbm2ddl.auto">create</property>
        <property name="hbm2ddl.auto">update</property>

		<mapping resource="com/nerd/entity/Event.hbm.xml"/>
		<mapping resource="com/nerd/entity/Person.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

5：启动和辅助类

package com.nerd.util;

import org.apache.log4j.Logger;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
	private static final SessionFactory sessionFactory;
	private static final Logger LOGGER = Logger.getLogger(HibernateUtil.class);
	static{
		try {
			LOGGER.debug("HibernateUti.static - loading cofig");
			sessionFactory = new Configuration().configure("hibernate.cfg.xml").buildSessionFactory();
			LOGGER.debug("HibernateUtil.static - end");
		} catch (Throwable ex) {
			LOGGER.error("HibernateUti error : ExceptionInInitializerError");
			throw new ExceptionInInitializerError(ex);
		}
	}

	public static SessionFactory getsSessionFactory(){
		return sessionFactory;
	}
}

package com.nerd.test;

import java.util.Date;
import java.util.List;

import org.hibernate.classic.Session;

import com.nerd.entity.Event;
import com.nerd.util.HibernateUtil;

public class EventManger {

	public static void main(String[] args) {
		EventManger mgr = new EventManger();
		if(args[0].equals("insert")){
			mgr.createAndStoreEvent("my event", new Date());

		}else if(args[0].equals("list")){
			@SuppressWarnings("rawtypes")
			List list = mgr.listEvents();
			for(int i=0;i<list.size();i++){
				Event theEvent = (Event)list.get(i);
				System.out.println("Event "+theEvent.getTitle()+"date "+theEvent.getDate());
			}
		}

		HibernateUtil.getsSessionFactory().close();
	}

	private void createAndStoreEvent(String title,Date date){
		Session session = HibernateUtil.getsSessionFactory().getCurrentSession();
		session.beginTransaction();
		Event event = new Event();
		event.setDate(date);
		event.setTitle(title);
		session.save(event);
		session.getTransaction().commit();
	}

	@SuppressWarnings("rawtypes")
	private List listEvents(){
		Session session = HibernateUtil.getsSessionFactory().getCurrentSession();
		session.beginTransaction();
		List list = session.createQuery("from Event").list();
		session.getTransaction().commit();
		return list;
	}
}

这样一个简单的hibernate实例就完成了。