传智播客Hibernate视频教程学习笔记10 11 12 13

最新推荐文章于 2013-07-16 10:57:34 发布

原创最新推荐文章于 2013-07-16 10:57:34 发布 · 679 阅读

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#hibernate #user #session #string #class #sqlserver

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本文通过一个简单的CRUD实验介绍了Hibernate的基本用法，包括配置文件、实体类定义、DAO接口及实现等，展示了如何进行数据的增删改查操作。

先贴CRUD实验的代码吧

文件结构图

User.java

package domain; import java.util.Date; public class User { private int id; private String name; private Date birthday; 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 Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } }

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 package="domain"> <class name="User" table="Users"> <id name="id"> <generator class="native"/> </id> <property name="name" unique="true"></property> <property name="birthday"></property> </class> </hibernate-mapping>

hibernate.cfg.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.microsoft.sqlserver.jdbc.SQLServerDriver</property> <property name="connection.url">jdbc:sqlserver://localhost:1433;databaseName=test;</property> <property name="connection.username">puf</property> <property name="connection.password">pufang890505</property>  <property name="dialect">org.hibernate.dialect.SQLServerDialect</property> <property name="hbm2ddl.auto">create</property>  <property name="show_sql">true</property> <mapping resource="domain/User.hbm.xml"/> </session-factory> </hibernate-configuration>

HibernateUtil.java

package dao; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public final class HibernateUtil { private static SessionFactory sessionFactory; private HibernateUtil(){ } static{ Configuration cfg = new Configuration(); cfg.configure(); sessionFactory = cfg.buildSessionFactory(); } public static SessionFactory getSessionFactory() { return sessionFactory; } public static Session getSession(){ return sessionFactory.openSession(); } }

UserDao.java

package dao; import domain.User; public interface UserDao { public void savdUser(User user); public User findUserByname(String name); public User findUserById(int id); public void updateUser(User user); public void remove(User user); }

UserDaoHibernateImpl.java

package dao.impl; import org.hibernate.Criteria; import org.hibernate.Session; import org.hibernate.Transaction; import org.hibernate.criterion.Restrictions; import dao.HibernateUtil; import dao.UserDao; import domain.User; public class UserDaoHibernateImpl implements UserDao { @Override public User findUserById(int id) { Session s = null; try{ s = HibernateUtil.getSession(); User user = (User)s.get(User.class, id); return user; }finally{ if(s != null){ s.close(); } } } @Override public User findUserByname(String name) { Session s = null; try{ s = HibernateUtil.getSession(); Criteria c = s.createCriteria(User.class); c.add(Restrictions.eq("name", name)); User user = (User)c.uniqueResult(); return user; }finally{ if(s != null){ s.close(); } } } @Override public void remove(User user) { Session s = null; Transaction ts = null; try{ s = HibernateUtil.getSession(); ts = s.beginTransaction(); s.delete(user); ts.commit(); }finally{ if(s != null){ s.close(); } } } @Override public void savdUser(User user) { Session s = null; Transaction ts = null; try{ s = HibernateUtil.getSession(); ts = s.beginTransaction(); s.save(user); ts.commit(); }finally{ if(s != null){ s.close(); } } } @Override public void updateUser(User user) { Session s = null; Transaction ts = null; try{ s = HibernateUtil.getSession(); ts = s.beginTransaction(); s.update(user); ts.commit(); }finally{ if(s != null){ s.close(); } } } }

test.java

import java.util.Date; import dao.UserDao; import dao.impl.UserDaoHibernateImpl; import domain.User; public class test { /** * @param args */ public static void main(String[] args) { UserDao userDao = new UserDaoHibernateImpl(); User user = new User(); user.setName("pf"); user.setBirthday(new Date()); userDao.savdUser(user); System.out.println("1"); user.setName("new pf"); userDao.updateUser(user); System.out.println("2"); User u = userDao.findUserById(1); System.out.println("3"); userDao.remove(u); System.out.println("4"); } }

测试成功。现在算是Hibernate入门了，虽然这些代码还很不规范，而且只是单表的CRUD。

继续学习。。。