一个简略的hibernate入门例子

2012-11-03

一个简单的hibernate入门例子！hibernate比较有用的一个简单入门例子，步骤详细见下面描述：1、创建表 TEST_US

一个简单的hibernate入门例子！

hibernate比较有用的一个简单入门例子，步骤详细见下面描述：

1、创建表 TEST_USER

??????????????? create table TEST_USER
??????????????? (
?????????????????? ID?????? VARCHAR2(40 CHAR) not null,
?????????????????? USERNAME VARCHAR2(255 CHAR),
????????????????? ?PASSWORD VARCHAR2(255 CHAR)
?????????????????? );

2、创建对应的entity文件? User.java

?????? ?????? public class User implements Serializable
?{
?private String id;
?private String username;
?private String password;
?public User() {
?}
?public String getId() {
??return id;
?}
?public void setId(String 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;
?}
?
}

3、创建user对象对应的hbm文件 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="cn.com.test.entity">
<class name="User" table="test_user" >
?<id name="id" column="id" length="40">
??????????? <generator ></property>
?<property name="password" ></property>
</class>
</hibernate-mapping>

4、创建hibernate的配置文件? 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="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
?<property name="hibernate.connection.url">jdbc:oracle:thin:@datebaseIp:1521:sid</property>
?<property name="hibernate.connection.username">username</property>
?<property name="hibernate.connection.password">password</property>
?<property name="hibernate.dialect">org.hibernate.dialect.Oracle9Dialect</property>
?
?
?<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
?<property name="hibernate.show_sql">true</property>
?
??? <mapping resource="cn/com/test/User.hbm.xml" />
</session-factory>

</hibernate-configuration>

5、创建sessionFactory工厂公共类

package com.pccw.dylan.demo.util;

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

public class HibernateUtil {
?private static SessionFactory factory;
?static {
??try {
???// 读取配置文件
???Configuration cfg = new Configuration().configure("hibernate.cfg.xml");
???factory = cfg.buildSessionFactory();
??} catch (Exception e) {
???e.printStackTrace();
??}
?}

?// 创建sessionFactory
?public static SessionFactory getSessionFactory() {
??return factory;
?}

?// 创建session
?public static Session getSession() {
??return factory.openSession();
?}

?// 关闭session，要关闭的时候条用这个方法就可以了
?public static void closeSession(Session session) {
??if (session != null) {
???if (session.isOpen()) {
????session.close();
???}
??}
?}
}

6、完成上面的步骤后，就可以写一个测试类进行测试

package com.pccw.dylan.demo.test;

import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;

import org.apache.log4j.Logger;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.pccw.dylan.demo.entity.User;
import com.pccw.dylan.demo.util.HibernateUtil;

public class HibernateTest {
?private static final Logger log = Logger.getLogger(HibernateTest.class);

?/** */
?/**
? * @param args
? * @throws HibernateException
? * @throws SQLException
? */
?public void insertUser() throws HibernateException, SQLException {
??Session session = (Session) HibernateUtil.getSession();
??Transaction tx = session.beginTransaction();
??User user = new User();
??user.setUsername("ttt");
??user.setPassword("ttt");
??session.save(user);
??tx.commit();
??HibernateUtil.closeSession(session);
??System.out.println("新增成功！");
?}

?public List getUsers() {

??Session session = (Session) HibernateUtil.getSession();
??Transaction tx = session.beginTransaction();
??String hql = "from User d? where d.username=:name";
??Query query = session.createQuery(hql);
??query.setString("name", "test");
??List list = query.list();
??tx.commit();
??HibernateUtil.closeSession(session);
??return list;
?}

?public void updateUsers() {
??Session session = (Session) HibernateUtil.getSession();
??Transaction tx = session.beginTransaction();
??String hql = "update? User? set password='gm' ";
??Query query = session.createQuery(hql);
??query.executeUpdate();
??tx.commit();
??HibernateUtil.closeSession(session);
??log.info("更新成功！");
?}

?public void deleteUsers() {
??Session session = (Session) HibernateUtil.getSession();
??Transaction tx = session.beginTransaction();
??String hql = "delete from User? where id='f104ed282e7979b3012e7979b4430001'";
??Query query = session.createQuery(hql);
??query.executeUpdate();
??tx.commit();
??HibernateUtil.closeSession(session);
??log.info("删除成功！");
?}

?public static void main(String[] args) throws HibernateException, SQLException {
??log.info("====begin===test====");
??new HibernateTest().insertUser();
??// new HibernateTest().updateUsers();
??// new HibernateTest().deleteUsers();
??List list = new HibernateTest().getUsers();
??for (Iterator iter = list.iterator(); iter.hasNext();) {
???User user = (User) iter.next();
???log.info(user.getPassword());
??}
?}
}

在做的过程中可能会碰到一些问题，红色字体标明容易导致异常的地方，应该特别注意。项目依赖一些jar包入

antlr.jar

asm.jar

cglib.jar

commons-beanutils.jar

commons-collections.jar

commons-logging.jar

dom4j.jar

hibernate3.jar

j2ee.jar

log4j.jar

oracle.jar?

spring.jar

由于连接的是oracle数据库所以采用oracle的驱动

其中没有写明jar包的版本号,一般别太老的版本就应该没有问题的。

工程的目录结构不做强调，可以写到一起，也可以分成不同的包路径，不做详细说明。

希望这个例子能帮助需要的人。谢谢大家支持。特殊声明：部分代码也参照网上的例子。

??????????

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一个简略的hibernate入门例子