Hibernate BaseDao

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package com.dao;

import java.util.ArrayList;
import java.util.List;

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

public class BaseDao {
   private static SessionFactory sf;
   private static ThreadLocal<Session> tl=new ThreadLocal<Session>();

   static{
       Configuration config=new Configuration().configure();
       sf=config.buildSessionFactory();
   }

   public static Session getSession(){
       Session session=tl.get();
       if(session==null){
           session=sf.openSession();
           //将获得的session保存到线程本地变量中
           tl.set(session);
       }
       return session;
   }

   public static void closeSession(){
       Session session=tl.get();
       if(session!=null && session.isOpen()){
           //将线程本地变量中的session清空
           tl.set(null);
           session.close();
       }
   }

   public static int add(Object obj){
       int count=0;
       Session session=getSession();
       session.beginTransaction();
       try {
           session.save(obj);
           session.getTransaction().commit();
           count=1;
       } catch (Exception e) {
           session.getTransaction().rollback();
           e.printStackTrace();
       }
       return count;
   }

   public static int update(Object obj){
       int count=0;
       Session session=getSession();
       session.beginTransaction();
       try {
           session.update(obj);
           session.getTransaction().commit();
           count=1;
       } catch (Exception e) {
           session.getTransaction().rollback();
           e.printStackTrace();
       }
       return count;
   }

   public static int delete(Object obj){
       int count=0;
       Session session=getSession();
       session.beginTransaction();
       try {
           session.delete(obj);
           session.getTransaction().commit();
           count=1;
       } catch (Exception e) {
           session.getTransaction().rollback();
           e.printStackTrace();
       }
       return count;
   }

   public static List findAll(Class clazz){
       List list=new ArrayList();
       Session session=getSession();
       Criteria c=session.createCriteria(clazz);
       list=c.list();
       closeSession();
       return list;
   }

   public static Object ById(Class clazz,int id ){
       Object obj=null;
       Session session=getSession();
       obj=session.get(clazz, id);
       closeSession();
       return obj;
   }

}

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