工具类 --BaseHibernateDao

import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.criterion.Example;
public class BaseHibernateDao {
 
 private Session session=null;
 private static SessionFactory sf;
 
 public void setSession(Session session){
  this.session=session;
 }
 protected Session getSession(){
  if(session!=null){
   return session;
  }
  else if(sf!=null){
   session=sf.openSession();
   return session;
  }
  Configuration cfg=new Configuration().configure();
  sf=cfg.buildSessionFactory();
  this.session=sf.openSession();
  return session;
 }
 /* insert */
 protected  boolean  add(Object item){
  Session session=getSession();
  Transaction tran=null;
  boolean is=false;
  try{
   tran=session.beginTransaction();
   session.save(item);
   tran.commit();
   is=true;
  }catch(Exception e){
   if(null!=tran)
    tran.rollback();
   e.printStackTrace();
  }finally{
   closeSession();
  }
  return is;
 }
 /* update */
 
 protected boolean update(Object item){
  Session session=getSession();
  Transaction tran=null;
  boolean is=false;
  try{
   tran=session.beginTransaction();
   session.update(item);
   tran.commit();
   is=true;
  }catch(Exception e){
   if(tran!=null)
    tran.rollback();
   e.printStackTrace();
  }finally{
   closeSession();
  }
  return is;
 }
 /* delete （根据实体删除） */
 protected boolean delete(Object item){
  Session session=getSession();
  Transaction tran=null;
  boolean is=false;
  try{
   tran=session.beginTransaction();
   session.delete(item);
   tran.commit();
   return is;
  }catch (Exception e) {
   if(tran!=null)
    tran.rollback();
   e.printStackTrace();
  }finally{
   closeSession();
  }
  return is;
 }
 /*根据主键删除（只能先查后删）*/
 protected boolean delete(Class cls,java.io.Serializable id){
  Session session = getSession();
  boolean is =false;
  try{
   Object obj = select(cls, id);
   session.delete(obj);
   session.getTransaction().commit();
   is=true;
  }catch(HibernateException e){
   if(null!=session)
    session.getTransaction().rollback();
   e.printStackTrace();
  }
  return is; 
 }
 /* 根据主键查询 */
 protected Object select(Class cls,java.io.Serializable id){
  Object obj=null;
  try {
   obj = getSession().get(cls, id);
  } catch (HibernateException e) {
   e.printStackTrace();
  } finally{
   closeSession();
  }
  return obj;
 }
 /* select (根据对象查询:对象初始化的属性越多，查询条件越多) */
 protected List select (Class clazz,Object obj){
  List result= null;
  try{
 result=getSession().createCriteria(clazz).add(Example.create(obj)).list();
   return result;
  }catch(Exception e){
   e.printStackTrace();
  }finally{
   closeSession();
  }
  return result;
 }
 /* 关闭session */
 protected void closeSession(){
  if(session!=null){
   session.close();
   session=null;
  }
 }
}