hibernate入门示例展示
有很长一段时间没有使用hibernate进行开发了，最近闲来无事，温习一下hibernate开发。搭建hibernate开发环境，下载hibernate3.3.2的jar包。所用数据库是mysql。
在使用hibernate3.3.2中要注意以下问题：
Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/helpers/NOPLoggerFactory
这是由于hibernate-distribution-3.3.2.GA中的带有的slf4j-api-1.5.8和最新下载的slf4j-1.6.1不兼容造成的，下载一个slf4j-1.5.8包就解决问题了。
一、导入hibernate使用的Jar包
见jar.jpg的图
二、配置hibernate的映射文件
<?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.format_sql">true</property><property name="hibernate.show_sql">true</property><property name="connection.url">jdbc:mysql://localhost:3306/test</property><property name="connection.username">root</property><property name="connection.password">sa</property><property name="connection.driver_class">com.mysql.jdbc.Driver</property><property name="dialect">org.hibernate.dialect.MySQLDialect</property><mapping resource="org/outman/domain/User.hbm.xml" /></session-factory></hibernate-configuration>
public class User implements java.io.Serializable {private static final long serialVersionUID = 1L;private Integer id;private String name;private String pwd;private Boolean verify;private Date registerDate;private BigDecimal salary; ......}<?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="org.outman.domain"><class name="User" table="t_user"><!--id name="id" type="integer" column="_id"><generator /></id--><!-- Oracle --><!--id name="id" type="integer" column="_id"><generator type="integer" column="_id"><!-- Hibernate根据方言来确定 identity、sequence、... --><generator type="string" column="_name" /><property name="pwd" type="string" column="_pwd" /><property name="verify" type="yes_no" column="_verify" /><property name="registerDate" type="date"column="_register_date" /><property name="salary" type="big_decimal" column="_salary" /></class></hibernate-mapping>
package org.outman.util;import org.hibernate.cfg.Configuration;import org.hibernate.tool.hbm2ddl.SchemaExport;public class ExportDB {public static void main(String[] args) {// 读取hibernate.cfg.xml文件Configuration cfg = new Configuration().configure();SchemaExport export = new SchemaExport(cfg);export.create(true, true);}}package org.outman.util;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class HibernateUtil {private static SessionFactory factory;private static Configuration conf;static {conf = new Configuration();conf.configure();factory = conf.buildSessionFactory();}public static Session openSession() {return factory.openSession();}}package org.outman.test;import java.math.BigDecimal;import java.util.Date;import java.util.List;import junit.framework.TestCase;import org.hibernate.HibernateException;import org.hibernate.Query;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;import org.outman.domain.User;import org.outman.util.HibernateUtil;public class MyTest extends TestCase {public void testSaveUser() {// 调用 Hibernate API// 加载配置文件Configuration conf = new Configuration();// 按照默认的路径和文件名装载配置文件conf.configure(); // hibernate.cfg.xml// conf.configure(File file);// conf.addClass(User.class);// 装载和User类对应的映射文件// User.hbm.xml// 1 重量级的对象// 2 线程安全的对象SessionFactory factory = conf.buildSessionFactory();// Session提供了ORM操作的接口// 相当于JDBC的ConnectionSession session = null;Transaction tx = null;try {session = factory.openSession();User user = new User();user.setName("java");user.setPwd("123456");user.setVerify(false);user.setRegisterDate(new Date());user.setSalary(new BigDecimal("12345.67"));tx = session.getTransaction();tx.begin();session.save(user);tx.commit();} catch (HibernateException e) {e.printStackTrace();tx.rollback();} finally {session.close();}}public void testDeleteUser() {Session session = HibernateUtil.openSession();Transaction tx = session.getTransaction();tx.begin();User user = new User();user.setId(8);session.delete(user);tx.commit();session.close();}public void testGetUser() {Session session = HibernateUtil.openSession();// 延缓加载// User user = (User) session.load(User.class, 9);User user = (User) session.get(User.class, 9);System.out.println("----------");System.out.println(user.getName() + "," + user.getPwd());session.close();}public void testUpdateUser() {Session session = HibernateUtil.openSession();Transaction tx = session.getTransaction();tx.begin();User user = new User();user.setId(1);user.setName("java");user.setPwd("88888888");session.update(user);// session.saveOrUpdate(user);tx.commit();session.close();}@SuppressWarnings("unchecked")public void testQueryUser() {Session session = HibernateUtil.openSession();// HQL Hibernate Query Language// SQLQuery query = session.createQuery("from User u where u.name=?");query.setParameter(0, "java");// Iterator<User> it = query.iterate();// while (it.hasNext()) {// User user = it.next();// System.out.println(user.getName() + "," + user.getPwd());// }List<User> userList = query.list();for (User user : userList) {System.out.println(user.getName() + "," + user.getPwd());}session.close();}}