Hibernate使用xml配置文件的方式

1、下载Hibernate3.0.jar包。

2、在src下新建hibernate.cfg.xml文件其内容如下：

 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE  hibernate-configuration   
       PUBLIC  "-//Hibernate/Hibernate  Configuration  DTD//EN"   
       "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
	<session-factory>
		<property name="show_sql">true</property><!-- 显示SQL语句 -->
		<property name="max_fetch_depth">1</property><!-- 未知 -->
		<property name="jdbc.fetch_size">5</property><!-- 未知 -->
		<property name="connection.url">jdbc:mysql://localhost:3306/myuser?useUnicode=true&amp;characterEnconding=GB2312</property><!-- 连接数据库字符串 -->
		<property name="connection.username">****</property><!-- 数据库用户名 -->
		<property name="connection.password">****</property><!-- 数据库密码 -->
		<property name="connection.driver_class">com.mysql.jdbc.Driver</property><!-- 驱动路径 -->
		<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property><!-- 数据库方言 -->
		<mapping resource="com/test/myhibernate/dto/user.hbm.xml" /><!-- hbm.xml文件配置路径 -->
	</session-factory>
</hibernate-configuration>

 

3、根据项目要求在模块目录下新建几个pagekage。分别是：action,dto,dao,util。

4、在dto中新建user.hbm.xml和User.java。其内容分别如下：

     4.1——user.hbm.xml：

 

<?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.tset.myhibernate.dto.User" table="user"
		dynamic-insert="true" dynamic-update="true">
		<id name="id" column="id">
			<generator class="increment" />
		</id>
		<property name="username" column="username" type="string"/>
		<property name="password" column="password" type="string"/>
		<property name="name" column="name" type="string"/>
		<property name="age" column="age" type="java.lang.Long"/>
		<property name="sex" column="sex" type="string" />
		<property name="birthday" column="birthday" type="string"/>
	</class>
</hibernate-mapping>

 

     4.1——User.java：

5、在dao中新建一个接口UserInterface.java。其内容如下：

package com.test.myhibernate.dao;

import java.util.List;

import com.test.myhibernate.dto.User;

public interface UserInterface {
	/**
	 * @deprecated 得到所有的用户对象
	 * @return
	 */
	public abstract List<User>  getAllUser();
	/**
	 * @deprecated 通过Id查询到一个User对象。 
	 * @param id
	 * @return
	 */
	public abstract User        getUserById(int id);
	/**
	 * @deprecated 通过Id删除一个User对象
	 * @param id
	 * @return
	 */
	public abstract boolean     deleteUserById(int id);
	/**
	 * @deprecated 添加一个User记录
	 * @param user
	 * @return
	 */
	public abstract boolean 	addUser(User user);
	/**
	 * @deprecated 修改一条记录
	 * @param user
	 * @return
	 */
	public abstract boolean 	updateUser(User user);
}

 

6、在dao中实现这个接口UserDAO.java。其内容如下：

package com.test.myhibernate.dao;

import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import com.test.myhibernate.dto.User;
import com.test.myhibernate.util.HibernateBase;

/*******************************************************************************
 * @deprecated 数据库操作DAO
 * @author 高增光
 * @time 2009-年11月09日
 */
public class UserDAO extends HibernateBase implements UserInterface {

	/**
	 * @throws HibernateException
	 */
	public UserDAO() throws HibernateException {
		super();
	}

	@Override
	public boolean addUser(User user) {
		try {
			beginTransaction();
			if (user != null) {
				session.save(user);
				return true;
			} else {
				return false;
			}
		} catch (Exception e) {
			e.printStackTrace();
			endTransaction(false);
			return false;
		} finally {
			endTransaction(true);
		}
	}

	@Override
	public boolean deleteUserById(int id) {
		try {
			beginTransaction();
			User user = (User) session.get(
					com.test.myhibernate.dto.User.class, new Long(id));
			if (user != null) {
				session.delete(user);
				return true;
			} else {
				System.out.print("没有该记录！");
				return false;
			}
		} catch (Exception e) {
			e.printStackTrace();
			endTransaction(false);
			return false;
		} finally {
			endTransaction(true);
		}
	}

	@Override
	public List<User> getAllUser() {
		try {
			beginTransaction();
			Query users = session
					.createQuery("from com.test.myhibernate.dto.User");
			List<User> list = users.list();
			return list;
		} catch (HibernateException e) {
			e.printStackTrace();
			endTransaction(false);
			return null;
		} finally {
			endTransaction(true);
		}
	}

	@Override
	public User getUserById(int id) {
		try {
			beginTransaction();
			User user = (User) session.get(
					com.test.myhibernate.dto.User.class, new Long(id));
			if (user != null) {
				return user;
			} else {
				System.out.print("没有该记录！");
				return null;
			}
		} catch (HibernateException e) {
			e.printStackTrace();
			endTransaction(false);
			return null;
		} finally {
			endTransaction(true);
		}
	}

	@Override
	public boolean updateUser(User user) {
		try {
			beginTransaction();
			if (user != null) {
				session.update(user);
				return true;
			} else {
				return false;
			}
		} catch (HibernateException e) {
			e.printStackTrace();
			endTransaction(false);
			return false;
		} finally {
			endTransaction(true);
		}
	}
}

 

7、在util中新建HibernateBase.java。初始SessionFactory。其内容如下：

package com.test.myhibernate.util;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class HibernateBase {

	private static SessionFactory sessionFactory = null;// 会话工厂，用于创建会话
	public Session session;// hibernate会话
	public Transaction transaction; // hiberante事务
	/***
	 * @throws HibernateException
	 */
	public HibernateBase() throws HibernateException {// 初始化Session
		this.initHibernate();
	}

	/***
	 * @throws HibernateException
	 */
	public void initHibernate() throws HibernateException {

		// 装载配置，构造SessionFactory对象
		if (sessionFactory == null) {
			sessionFactory = new Configuration().configure()
					.buildSessionFactory();
		}
	}
	/****
	 * 开始一个hibernate事务
	 * @throws HibernateException
	 */
	public void beginTransaction() throws HibernateException {

		session = sessionFactory.openSession();
		transaction = session.beginTransaction();
	}

	/****
	 * 结束一个hibernate事务。
	 * @throws HibernateException
	 */
	public void endTransaction(boolean commit) throws HibernateException {

		if (commit) {
			transaction.commit();
		} else {
			// 如果是只读的操作，不需要commit这个事务。
			transaction.rollback();
		}
		session.close();
	}
}

 

8、在action中新建一个测试类main.java。其内容如下：

package com.test.myhibernate.action;

import java.util.ArrayList;
import java.util.List;

import com.test.myhibernate.dao.UserDAO;
import com.test.myhibernate.dto.User;

public class main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		/*初始化数据*/
		User user = new User();
		user.setAge(22);
		user.setBirthday("1988-10-07");
		user.setName("Sun-Shine");
		user.setPassword("te sf");
		user.setSex("dfd");
		user.setUsername("dddddd");
		
		UserDAO userDAO = new UserDAO();
		
		userDAO.addUser(user);
		
		
		userDAO.deleteUserById(2);
		user.setId(3);
		user.setName("xiaozhou");
		userDAO.updateUser(user);
		
		List<User> list = new ArrayList<User>(); 
		list = userDAO.getAllUser();
		int size = list.size();
		for(int i=0;i < size;i++)
		{
			System.out.println(list.get(i).getId());
		}
		User newUser = userDAO.getUserById(1);
		System.out.println(newUser);
		
		
	}
}