2.复合主键:工具类

package com.bjpowernode.hibernate;

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

public class HibernateUtils {

	private static SessionFactory factory;
	
	static {
		try {
			//读取hibernate.cfg.xml文件
			Configuration cfg = new Configuration().configure();
			
			//建立SessionFactory
			factory = cfg.buildSessionFactory();
		}catch(Exception e) {
			e.printStackTrace();
		}
	}
	
	public static Session getSession() {
		return factory.openSession();
	} 
	
	public static void closeSession(Session session) {
		if (session != null) {
			if (session.isOpen()) {
				session.close();
			}
		}
	}
	
	public static SessionFactory getSessionFactory() {
		return factory;
	}
}

package com.bjpowernode.hibernate;

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

/**
 * 将hbm生成ddl
 * @author Administrator
 *
 */
public class ExportDB {

	public static void main(String[] args) {
		
		//默认读取hibernate.cfg.xml文件
		Configuration cfg = new Configuration().configure();
		
		SchemaExport export = new SchemaExport(cfg);
		export.create(true, true);
	}
}