Hibernate学习笔记（简单的Hibernate环境搭建）

导入Hibernate3.3环境所需的架包.
建立Person类（使用注解方式）：

public class Person {
	@Id
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	@Column(name="ID")
	private Integer id;
	@Column(name="NAME",length=100,nullable=false)
	private String name;
	@Column(name="DATE",nullable=false)
	private Date date;
        public Person(Integer id, String name, Date date) {
		this.id = id;
		this.name = name;
		this.date = date;
	}
        //get/set
	@Override
	public String toString() {
		return id + "," + name + "," + date;
	}

}

实现类(接口不贴了):

package org.savior;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

public class PersonDaoImpl implements PersonDao {
	private SessionFactory sessionFactory;

	public PersonDaoImpl() {
		Configuration cg = new AnnotationConfiguration().configure();
		sessionFactory = cg.buildSessionFactory();
	}

	public void delete(Person person) {
		Session session = sessionFactory.openSession();
		Transaction tx = session.beginTransaction();
		try {
			tx.begin();
			session.delete(person);
			tx.commit();
		} catch (RuntimeException e) {
			tx.rollback();
			throw e;
		} finally {
			session.close();
		}
	}

	@SuppressWarnings("unchecked")
	public List<Person> findAll() {
		Session session = sessionFactory.openSession();

		try {
			Query q = session.createQuery("from Person");
			return q.list();
		} finally {
			session.close();
		}
	}

	public Person findById(int personId) {
		Session session = sessionFactory.openSession();
		return (Person) session.get(Person.class, personId);

	}

	public void save(Person person) {
		Session session = sessionFactory.openSession();
		Transaction tx = session.beginTransaction();
		try {
			tx.begin();
			session.saveOrUpdate(person);
			tx.commit();
		} catch (RuntimeException e) {
			tx.rollback();
			throw e;
		} finally {
			session.close();
		}
	}

	public void update(Person person) {
		Session session = sessionFactory.openSession();
		Transaction tx = session.beginTransaction();
		try {
			tx.begin();
			session.update(person);
			tx.commit();
		} catch (RuntimeException e) {
			tx.rollback();
			throw e;
		} finally {
			session.close();
		}
	}

}

测试：

package org.savior;

import java.util.GregorianCalendar;
import java.util.Iterator;
import java.util.List;

public class textHibernate {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		PersonDao personDao = new PersonDaoImpl();

		Person person = new Person();
		person.setName("savior");
		person.setDate(new GregorianCalendar(2011, 1, 1).getTime());
		personDao.save(person);
		List<Person> persons = personDao.findAll();
		for(Iterator<Person> it=persons.iterator();it.hasNext();){
			person=(Person)it.next();
			System.out.println(person);
		}
		Integer id=persons.get(0).getId();
		person=personDao.findById(id);
		System.out.println(person);
		//personDao.delete(person);
		person.setName("puppy");
		personDao.update(person);
		System.out.println(person);
	}
}

hibernate.cgf.xml

<?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:3307/test</property>  
        <property name="connection.username">root</property>  
        <property name="connection.password">123</property>  
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>  
        <property name="show_sql">true</property>  
        <property name="hbm2ddl.auto">update</property>  
        <mapping class="org.savior.Person" />  
    </session-factory>  
</hibernate-configuration>  

一个简单的Hibernate应用就完成了