HibernateUtil工具 高级本地线程的Session封装 高级增删查改及分页实现

 

<strong><span style="font-size:18px;">package com.hsp.util;import java.util.List;import org.hibernate.Query;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;final public class HibernateUtil {private static SessionFactory sessionFactory=null;//使用线程局部模式private static ThreadLocal<Session> threadLocal=new ThreadLocal<Session>();private HibernateUtil(){};static {sessionFactory=new Configuration().configure().buildSessionFactory();}//获取全新的全新的sesessionpublic static Session openSession(){return sessionFactory.openSession();}//获取和线程关联的sessionpublic static Session getCurrentSession(){Session session=threadLocal.get();//判断是否得到if(session==null){session=sessionFactory.openSession();//把session对象设置到 threadLocal,相当于该session已经和线程绑定threadLocal.set(session);}return session;}//统一的一个修改和删除(批量 hql) hql"delete upate ...??"public static void executeUpdate(String hql,String [] parameters){Session s=null;Transaction tx=null;try {s=openSession();tx=s.beginTransaction();Query query=s.createQuery(hql);//先判断是否有参数要绑定if(parameters!=null&& parameters.length>0){for(int i=0;i<parameters.length;i++){query.setString(i, parameters[i]);}}query.executeUpdate();tx.commit();} catch (Exception e) {e.printStackTrace();throw new RuntimeException(e.getMessage());// TODO: handle exception}finally{if(s!=null&&s.isOpen()){s.close();}}}//统一的添加的方法public  static void save(Object obj){Session s=null;Transaction tx=null;try {s=openSession();tx=s.beginTransaction();s.save(obj);tx.commit();} catch (Exception e) {if(tx!=null){tx.rollback();}throw new RuntimeException(e.getMessage());// TODO: handle exception}finally{if(s!=null && s.isOpen()){s.close();}}}//提供一个统一的查询方法(带分页) hql 形式 from 类  where 条件=? ..public static List executeQueryByPage(String hql,String [] parameters,int pageSize,int pageNow){Session s=null;List list=null;try {s=openSession();Query query=s.createQuery(hql);//先判断是否有参数要绑定if(parameters!=null&& parameters.length>0){for(int i=0;i<parameters.length;i++){query.setString(i, parameters[i]);}}query.setFirstResult((pageNow-1)*pageSize).setMaxResults(pageSize);list=query.list();} catch (Exception e) {e.printStackTrace();throw new RuntimeException(e.getMessage());// TODO: handle exception}finally{if(s!=null&&s.isOpen()){s.close();}}return list;}//提供一个统一的查询方法 hql 形式 from 类  where 条件=? ..public static List executeQuery(String hql,String [] parameters){Session s=null;List list=null;try {s=openSession();Query query=s.createQuery(hql);//先判断是否有参数要绑定if(parameters!=null&& parameters.length>0){for(int i=0;i<parameters.length;i++){query.setString(i, parameters[i]);}}list=query.list();} catch (Exception e) {e.printStackTrace();throw new RuntimeException(e.getMessage());// TODO: handle exception}finally{if(s!=null&&s.isOpen()){s.close();}}return list;}}如何调用：</span></strong><pre name="code" class="java">//调用修改/删除/*String hql="update Student set sage=sage+1 where sdept=?";String parameters[]={"计算机系"};try {HibernateUtil.executeUpdate(hql, parameters);} catch (Exception e) {System.out.println(e.getMessage());// TODO: handle exception}*/

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/*添加*//*Course c=new Course();c.setCname("servlet");c.setCid(4L);HibernateUtil.save(c);*/

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//使用工具分页/*String hql="select sname,saddress from Student order by sage";String parameters[]=null;List<Object[]> list= HibernateUtil.executeQueryByPage(hql, parameters, 2, 3) ;for(Object[] s: list){System.out.println(s[0].toString()+" "+s[1].toString());}*/