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。