项目结构图
一、导入jar包（java project 导包—— build path—configure build path—add external JARs），如上图所示
二、在MySQL数据库中建立相应的数据库和数据表，然后再项目中建立他的实体类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、创建映射文件User.hbm.xml。完成数据表到实体类的映射
<?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、创建配置文件Hibernate.cfg.xml。配置数据库，并指向映射配置文
<?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、新建工具类，读取配置文件，创建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、编写dao接口和dao的实现类
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、编写测试类
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("所查询ID的姓名是"+user.getName()); } }
运行结果
jar包下载地址：http://download.csdn.net/detail/forrest_ou/9630608
感想：IT方面的知识变化的很快，例如Hibernate中的buildFactory()方法已经被弃掉了，采用了新的方法，见第五步，新建工具类中
