2.多对多双向关联(用户对角色) 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SessionFactoryfactory = 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);}}