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本文介绍了一个使用Hibernate框架连接DB2数据库的具体实现案例。包括配置文件hibernate.cfg.xml的详细设置，实体类UsersPO及其映射文件UsersPO.hbm.xml的设计，DAO层操作UsersDAO的增删改查功能实现，以及JUnit测试用例验证。
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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">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

<session-factory>
	<property name="hbm2ddl.auto">update</property>
	<property name="dialect">org.hibernate.dialect.DB2Dialect</property>
	<property name="connection.url">jdbc:db2://192.168.25.230:50000/JSAMPLE</property>
	<property name="connection.username">zyl</property>
	<property name="connection.password">123</property>
	<property name="connection.driver_class">com.ibm.db2.jcc.DB2Driver</property>
	<property name="myeclipse.connection.profile">zyl</property>
    <mapping resource="com/zyl/po/UsersPO.hbm.xml" />

</session-factory>

</hibernate-configuration>
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UsersPO.java

package com.zyl.po;

import java.io.Serializable;
import java.util.Date;


public class UsersPO implements Serializable{
	/**
	 * 
	 */
	private Long usersID;
	private String username;
	private String userpassword;
	private Date regDate;
	public Long getUsersID() {
		return usersID;
	}
	public void setUsersID(Long usersID) {
		this.usersID = usersID;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getUserpassword() {
		return userpassword;
	}
	public void setUserpassword(String userpassword) {
		this.userpassword = userpassword;
	}
	public Date getRegDate() {
		return regDate;
	}
	public void setRegDate(Date regDate) {
		this.regDate = regDate;
	}
	public UsersPO(String username, String userpassword, Date regDate) {
		super();
		this.username = username;
		this.userpassword = userpassword;
		this.regDate = regDate;
	}



}
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UsersPO.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="com.zyl.po" schema="zyl">
 <class name="UsersPO" table="zylUsers">
  <id column="usersID" name="usersID" type="long">
   <generator class="sequence">
    <param name="sequence">users_seq</param>
   </generator>
  </id>
  <property name="username" type="string"/>
  <property name="userpassword" type="string"/>
  <property name="regDate" type="date"/>
 </class>
 <database-object>
  <create><![CDATA[create sequence users_seq start with 1]]></create>
  <drop></drop>
  <dialect-scope name="org.hibernate.dialect.DB2Dialect"/>
 </database-object>
</hibernate-mapping>
-------------------------------------------------------------------------------------------
UsersDAO.java

package com.zyl.dao;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.zyl.factory.HibernateSessionFactory;
import com.zyl.po.UsersPO;

public class UsersDAO {

	public void saveUser(UsersPO usersPO){
		Session session = HibernateSessionFactory.getSession();
		Transaction trans = session.beginTransaction();

		session.save(usersPO);

		trans.commit();
		session.close();
	}
	public UsersPO findUsersById(Long id){

			Session session = HibernateSessionFactory.getSession();
			Transaction trans = session.beginTransaction();

UsersPO usersPO	=(UsersPO)session.load(com.zyl.po.UsersPO.class, id);		
			trans.commit();
			session.close();
			return usersPO;
		}
	public List<UsersPO> findAllUsersPO(){

		Session session = HibernateSessionFactory.getSession();
		Transaction trans = session.beginTransaction();


		Query query = session.createQuery("select u from UsersPO u order by u.usersID desc");
		List<UsersPO> usersList = query.list();



		trans.commit();

		session.close();

		return usersList;
	}
	  public void updateUsersPO(UsersPO usersPO){

	    	Session session = HibernateSessionFactory.getSession();
			Transaction trans = session.beginTransaction();


			session.update(usersPO);


			trans.commit();

			session.close();


	    }	

	    public void deleteUsersPO(UsersPO usersPO){

	    	Session session = HibernateSessionFactory.getSession();
			Transaction trans = session.beginTransaction();


			session.delete(usersPO);


			trans.commit();

			session.close();


	    }


}
-------------------------------------------------------------------------------------------
package com.ascent.dao.test;

import java.util.List;

import junit.framework.Assert;

import org.junit.Test;

import com.ascent.dao.UsersDAO;
import com.ascent.po.UsersPO;

public class UsersDAOTestCase {

	///@Test
	public void testSaveUsers() {

		UsersPO usersPO = new UsersPO("zyl","123",new java.util.Date());		
		UsersDAO usersDAO = new UsersDAO();

		usersDAO.saveUsers(usersPO);

		Assert.assertNotNull("插入失败",usersPO.getUsersID());
		System.out.println(usersPO.getUsersID());


	}

	//@Test
	public void testFindUsersPOById(){

		UsersDAO usersDAO = new UsersDAO();

		UsersPO usersPO = usersDAO.findUsersById(2L);

		Assert.assertNotNull("查询失败",usersPO);
		System.out.println(usersPO.toString());


	}

	//@Test
	public void testFindAllUsersPO(){

		UsersDAO usersDAO = new UsersDAO();

		List<UsersPO> usersList = usersDAO.findAllUsersPO();


		Assert.assertNotNull(usersList);

		for (UsersPO usersPO : usersList) {
			System.out.println(usersPO);
		}



	}

	///@Test
	public void testUpdateUsersPO(){

         UsersDAO usersDAO = new UsersDAO();

		 UsersPO usersPO = usersDAO.findUsersById(2L);

	     Assert.assertNotNull("查询失败",usersPO);


	     usersPO.setUsersName("xyf");

	     usersDAO.updateUsersPO(usersPO);


	}

	@Test
	public void testDeleteUsersPO(){

         UsersDAO usersDAO = new UsersDAO();

		 UsersPO usersPO = usersDAO.findUsersById(1L);

	     Assert.assertNotNull("查询失败",usersPO);


	    //  usersPO.setUsersName("ddd");

	     usersDAO.deleteUsersPO(usersPO);


	}




}-------------------------------------------------------------------------------------------
HibernateSessionFactory.java


package com.zyl.hiber.SessionFactory;

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

/**
 * Configures and provides access to Hibernate sessions, tied to the
 * current thread of execution.  Follows the Thread Local Session
 * pattern, see {@link http://hibernate.org/42.html }.
 */
public class HibernateSessionFactory {

    /** 
     * Location of hibernate.cfg.xml file.
     * Location should be on the classpath as Hibernate uses  
     * #resourceAsStream style lookup for its configuration file. 
     * The default classpath location of the hibernate config file is 
     * in the default package. Use #setConfigFile() to update 
     * the location of the configuration file for the current session.   
     */
    private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
	private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
    private  static Configuration configuration = new Configuration();    
    private static org.hibernate.SessionFactory sessionFactory;
    private static String configFile = CONFIG_FILE_LOCATION;

	static {
    	try {
			configuration.configure(configFile);
			sessionFactory = configuration.buildSessionFactory();
		} catch (Exception e) {
			System.err
					.println("%%%% Error Creating SessionFactory %%%%");
			e.printStackTrace();
		}
    }
    private HibernateSessionFactory() {
    }

	/**
     * Returns the ThreadLocal Session instance.  Lazy initialize
     * the <code>SessionFactory</code> if needed.
     *
     *  @return Session
     *  @throws HibernateException
     */
    public static Session getSession() throws HibernateException {
        Session session = (Session) threadLocal.get();

		if (session == null || !session.isOpen()) {
			if (sessionFactory == null) {
				rebuildSessionFactory();
			}
			session = (sessionFactory != null) ? sessionFactory.openSession()
					: null;
			threadLocal.set(session);
		}

        return session;
    }

	/**
     *  Rebuild hibernate session factory
     *
     */
	public static void rebuildSessionFactory() {
		try {
			configuration.configure(configFile);
			sessionFactory = configuration.buildSessionFactory();
		} catch (Exception e) {
			System.err
					.println("%%%% Error Creating SessionFactory %%%%");
			e.printStackTrace();
		}
	}

	/**
     *  Close the single hibernate session instance.
     *
     *  @throws HibernateException
     */
    public static void closeSession() throws HibernateException {
        Session session = (Session) threadLocal.get();
        threadLocal.set(null);

        if (session != null) {
            session.close();
        }
    }

	/**
     *  return session factory
     *
     */
	public static org.hibernate.SessionFactory getSessionFactory() {
		return sessionFactory;
	}

	/**
     *  return session factory
     *
     *	session factory will be rebuilded in the next call
     */
	public static void setConfigFile(String configFile) {
		HibernateSessionFactory.configFile = configFile;
		sessionFactory = null;
	}

	/**
     *  return hibernate configuration
     *
     */
	public static Configuration getConfiguration() {
		return configuration;
	}

}-------------------------------------------------------------------------------------------
ToDDL.java


package com.zyl.util;


import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;


public class ToDDL {
public static void main (String[] args) {
	Configuration configure= new Configuration();
	configure.configure("hibernate.cfg.xml");
	SchemaExport sc=new SchemaExport(configure);
	sc.create(true, true);

}
}


-------------------------------------------------------------------------------------------
log4j.properties


log4j.rootLogger=DEBUG,A1
log4j.appender.A1 = org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.TTCCLayout


-------------------------------------------------------------------------------------------

junit测试
增删改查
hibernate连DB2

Zyl.java和Zyl.hbm.xml是由表ZYL是逆向工程生成的 DB Browser - 表(zyl) 右键 - Java src forder :/hibernateTest/src ,Java package:com.zyl.po - hibernate Reverse Engneering-选Create POJO和java data Object-Hibernate types 和 identity

表zylusers 是正向生成的表里有userid,username,userpassword,regDate
    <mapping resource="com/zyl/po/UsersPO.hbm.xml" />
 HibernateSessionFactory.java
用myeclipse 自动生成hibernate 
点项目名称--右键--MyEclipse--Add Hibernate Capabilities