Hibernate4入门到精通一——————第一个Hibernate程序

一、Hibernate简介

二、第一个Hibernate4程序

1、新建Java project 。名字为Hibernate4——01

2、在src下新建lib文件夹，并导入必须的包。

并Add to build path

3、在src目录下创建Hibernate的配置文件

hibernate.cfg.xml如下：

<!DOCTYPE hibernate-configuration PUBLIC"-//Hibernate/Hibernate Configuration DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration><session-factory><!-- hibernate的方言，用来确定连接的数据库 --><property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property><!-- 数据库的连接类 --><property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property><!-- 数据库的连接字符串和用户名密码 --><property name="hibernate.connection.url">jdbc:mysql://localhost:3306/itat_hibernate</property><!-- 密码为空 --><property name="hibernate.connection.username">root</property><property name="hibernate.connection.password"></property><!-- 在使用hibernate时会显示相应的SQL --><property name="show_sql">true</property><!-- 会自动完成类到数据表的转换 --><property name="hibernate.hbm2ddl.auto">update</property></session-factory></hibernate-configuration>

4、在包org.zttc.itat.model下新建实体类

User.java

package org.zttc.itat.model;import java.util.Date;public class User {private int id;private String username;private String password;private String nickname;private Date born;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getNickname() {return nickname;}public void setNickname(String nickname) {this.nickname = nickname;}public Date getBorn() {return born;}public void setBorn(Date born) {this.born = born;}public User(int id, String username, String password, String nickname,Date born) {this.id = id;this.username = username;this.password = password;this.nickname = nickname;this.born = born;}public User() {}}

5、在包org.zttc.itat.model下新建

User.hbm.xml

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping package="org.zttc.itat.model">    <class name="User" table="t_user">        <id name="id">            <generator class="native"/>        </id><property name="username"/><property name="password"/><property name="nickname"/><property name="born" type="timestamp"/>    </class></hibernate-mapping>

6、将配置文件添加到hibernate的cfg的配置文件中，即hibernate.cfg.xml改动如下：

<!DOCTYPE hibernate-configuration PUBLIC"-//Hibernate/Hibernate Configuration DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration><session-factory><!-- hibernate的方言，用来确定连接的数据库 --><property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property><!-- 数据库的连接类 --><property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property><!-- 数据库的连接字符串和用户名密码 --><property name="hibernate.connection.url">jdbc:mysql://localhost:3306/itat_hibernate</property><!-- 密码为空 --><property name="hibernate.connection.username">root</property><property name="hibernate.connection.password"></property><!-- 在使用hibernate时会显示相应的SQL --><property name="show_sql">true</property><!-- 会自动完成类到数据表的转换 --><property name="hibernate.hbm2ddl.auto">update</property><!-- 加入实体类的映射文件 --><mapping resource="org/zttc/itat/model/User.hbm.xml"/></session-factory></hibernate-configuration>

7、在数据库中新建itat_hibernate数据库。

8、在包org.zttc.itat.test先进测试类TestFirst.java 如下：

package org.zttc.itat.test;import java.util.Date;import org.hibernate.HibernateException;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;import org.hibernate.service.ServiceRegistry;import org.hibernate.service.ServiceRegistryBuilder;import org.junit.Test;import org.zttc.itat.model.User;public class TestFirst {@Testpublic void test01() {/* * 创建SessionFactory,SessionFactory是线程安全，所以整个SessionFactory应该基于单例的模式来创建 */Configuration cfg=new Configuration().configure();// cfg.buildSessionFactory(); 在hibernate3中可以，hibernate4中不可以ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(cfg.getProperties()).buildServiceRegistry();SessionFactory factory= cfg.buildSessionFactory(serviceRegistry);/* * 创建session */Session session =null;//一下代码完成了对象的添加操作try {session=factory.openSession();/* * 通过session完成各种操作 *///开启事务session.beginTransaction();User u=new User();u.setNickname("张三");u.setPassword("123");u.setUsername("zhangsan");u.setBorn(new Date());session.save(u);//提交事务session.getTransaction().commit();} catch (HibernateException e) {e.printStackTrace();if(session!=null) session.getTransaction().rollback();}finally{if(session!=null) session.close();}}}

运行测试程序。控制台打印：

Hibernate: insert into t_user (username, password, nickname, born) values (?, ?, ?, ?)

查看数据库发现数据库中自动生成数据表，并添加了数据

附录：项目工程目录