專案結構圖

一、匯入jar包（java project 導包—— build path—configure build path—add external JARs），如上圖所示

二、在MySQL資料庫中建立相應的資料庫和資料表，然後再專案中建立他的實體類User.java

package com.entity;

public class User {
	private int id;
	private String name;
	private String password;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}

}
 

三、建立對映檔案User.hbm.xml。完成資料表到實體類的對映

<?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 package="com.entity">
  <class name="User" table="user">
     <id name="id" column="id">
        <generator class="native"></generator>
     </id>
     <property name="name" column="name"></property>
     <property name="password" column="password"></property>
  </class>

</hibernate-mapping>
 

四、建立配置檔案Hibernate.cfg.xml。配置資料庫，並指向對映配置文

<?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="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
     <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/user_information</property>
     <property name="hibernate.connection.username">admin</property>
     <property name="hibernate.connection.password">123456</property>
     <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
     <mapping resource="com/entity/User.hbm.xml" />
   </session-factory>
 
 </hibernate-configuration>
 

五、新建工具類，讀取配置檔案，建立SessionFactory和Session

package com.util;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

public final class HibernateUtil {
	private HibernateUtil(){		
	}
	private static SessionFactory sessionFactory;
	static{
		Configuration cfg = new Configuration();
		cfg.configure();
		ServiceRegistry sr = new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build();
		sessionFactory = cfg.buildSessionFactory(sr);
	}
	public static SessionFactory getSeesionFactory(){
		return sessionFactory;
	}
	public static Session getSession(){
		return sessionFactory.openSession();
	}

}

六、編寫dao介面和dao的實現類

package com.dao;

import com.entity.User;

public interface UserDao {
	public void save(User user);
//	public void delete(User user);
	public User findUserById(int id);
//	public void update(User user);

}

package com.dao.impl;

import org.hibernate.Session;
import org.hibernate.Transaction;

import com.dao.UserDao;
import com.entity.User;
import com.util.HibernateUtil;

public class UserDaoImpl implements UserDao {
	
	Session session = HibernateUtil.getSession();

	@Override
	public void save(User user) {
		Transaction ts = session.beginTransaction();
		try {
			session.save(user);
			ts.commit();
		} finally {
			if(session != null)
				session.close();
		}
		
	}

	@Override
	public User findUserById(int id) {
		try {
			User user = (User)session.get(User.class, id);
			return user;
		} finally {
			if(session != null)
				session.close();
		}
		
	}

}

七、編寫測試類

package com.test;

import com.dao.UserDao;
import com.dao.impl.UserDaoImpl;
import com.entity.User;

public class Test {

	public static void main(String[] args) {
		User user = new User();
		UserDao dao = new UserDaoImpl();
		
//		user.setName("yl");
//		user.setPassword("0000");
//		dao.save(user);
		
		user= dao.findUserById(1);
		System.out.println("所查詢ID的姓名是"+user.getName());

	}

}

執行結果

感想：IT方面的知識變化的很快，例如Hibernate中的buildFactory()方法已經被棄掉了，採用了新的方法，見第五步，新建工具類中