hibernateutil.java

提供列车车次查询功能

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package java.hibernate_tier;

/**
 *
 * @author Administrator
 */
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.*;
import org.hibernate.cfg.*;
public class HibernateUtil {
private static Log log = LogFactory.getLog(HibernateUtil.class);
private static final SessionFactory sessionFactory;
static
{
    try
    {
        //生成sessionFactory
        sessionFactory=new Configuration().configure().buildSessionFactory();
    }
    catch(Throwable ex)
    {
        log.error("Initial SessionFactory creation failed.",ex);
        throw new ExceptionInInitializerError(ex);
    }
}
public static final ThreadLocal session=new ThreadLocal();
public static Session currentSession()
{
    Session s=(Session)session.get();
    if(s==null)
    {
        s=sessionFactory.openSession();
        session.set(s);
    }
    return s;
}
public static void closeSession()
{
    Session s=(Session)session.get();
    //如果该线程还不存在，打开一个新的
    if(s!=null)
        s.close();
    session.set(null);
}
}