MySessionFactory

package com.ORM;

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 MySessionFactory {

    /** 
     * 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 threadLocal = new ThreadLocal();
    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 MySessionFactory() {
    }
    
    /**
     * 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) {
        MySessionFactory.configFile = configFile;
        sessionFactory = null;
    }

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

}

package com.service;

import java.util.List;

import com.ORM.*;
import com.base.*;
import org.hibernate.*;

/** 系统用户管理接口实现 */
public class AdminServiceImpl extends BaseLog implements AdminService {

    /** 系统管理员登录 */
    public Admin adminLogin(String loginName, String loginPwd) throws Exception {
        Session session = MySessionFactory.getSession();
        Transaction tx = null;
        Admin admin = null;
        try{
            String hql = "select a from Admin as a where a.loginName=:loginName and a.loginPwd=:loginPwd";
            Query query = session.createQuery(hql);
            query.setString("loginName", loginName);
            query.setString("loginPwd", loginPwd);
            query.setMaxResults(1);
            tx = session.beginTransaction();
            admin = (Admin)query.uniqueResult();
            tx.commit();
        }catch(Exception ex){
            if(tx!=null)tx.rollback();
            logger.info("在执行AdminServiceImpl类中的adminLogin方法时出错：
");
            ex.printStackTrace();
        }finally{
            MySessionFactory.closeSession();
        }    
        return admin;
    }

    /** 新增管理员 */    
    public boolean addAdmin(Admin admin) throws Exception {
        Session session = MySessionFactory.getSession();
        Transaction tx = null;
        boolean status = false;
        try{
            tx = session.beginTransaction();
            session.save(admin);
            tx.commit();
            status = true;
        }catch(Exception ex){
            if(tx!=null)tx.rollback();
            logger.info("在执行AdminServiceImpl类中的addAdmin方法时出错：
");
            ex.printStackTrace();
        }finally{
            MySessionFactory.closeSession();
        }    
        return status;
    }

    /** 浏览管理员 */
    public List browseAdmin() throws Exception {
        Session session = MySessionFactory.getSession();
        Transaction tx = null;
        List list = null;
        try{
            Query query = session.createQuery("from Admin as a order by a.id");
            tx = session.beginTransaction();
            list = query.list();
            tx.commit();
            if (!Hibernate.isInitialized(list))Hibernate.initialize(list);
        }catch(Exception ex){
            if(tx!=null)tx.rollback();
            logger.info("在执行AdminServiceImpl类中的browseAdmin方法时出错：
");
            ex.printStackTrace();
        }finally{
            MySessionFactory.closeSession();
        }    
        return list;
    }

    /** 删除指定的管理员 */
    public boolean delAdmin(Integer id) throws Exception {
        Session session = MySessionFactory.getSession();
        Transaction tx = null;
        boolean status = false;
        try{
            tx = session.beginTransaction();
            Admin admin = (Admin)session.load(Admin.class, id);
            session.delete(admin);
            tx.commit();
            status = true;
        }catch(Exception ex){
            if(tx!=null)tx.rollback();
            logger.info("在执行AdminServiceImpl类中的delAdmin方法时出错：
");
            ex.printStackTrace();
        }finally{
            MySessionFactory.closeSession();
        }    
        return status;
    }

    /** 装载指定的管理员 */
    public Admin loadAdmin(Integer id) throws Exception {
        Session session = MySessionFactory.getSession();
        Transaction tx = null;
        Admin admin = null;
        try{
            tx = session.beginTransaction();
            admin = (Admin)session.get(Admin.class, id);
            tx.commit();
        }catch(Exception ex){
            if(tx!=null)tx.rollback();
            logger.info("在执行AdminServiceImpl类中的loadAdmin方法时出错：
");
            ex.printStackTrace();
        }finally{
            MySessionFactory.closeSession();
        }    
        return admin;
    }

    /** 更新管理员 */    
    public boolean updateAdmin(Admin admin) throws Exception {
        Session session = MySessionFactory.getSession();
        Transaction tx = null;
        boolean status = false;
        try{
            tx = session.beginTransaction();
            session.update(admin);
            tx.commit();
            status = true;
        }catch(Exception ex){
            if(tx!=null)tx.rollback();
            logger.info("在执行AdminServiceImpl类中的updateAdmin方法时出错：
");
            ex.printStackTrace();
        }finally{
            MySessionFactory.closeSession();
        }    
        return status;
    }
}