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  • hibernate的查询

    1、条件查询

    	public List<Weibo> selectOne(int k){
    		Session session = HibernateUtil.currentSession();
    		try {
    			Criteria c=session.createCriteria(Weibo.class);
    			c.add(Restrictions.eq("weiboId","M_Boj1Wc4xC"));//eq是等于,gt是大于,lt是小于,or是或
    			List<Weibo> list = (List<Weibo>)c.list();
    			return list;
    		} catch (Exception e) {
    			// TODO: handle exception
    			e.printStackTrace();
    			System.err.println("select failed!!!!!!");
    		}finally{
    			HibernateUtil.closeSession();
    			HibernateUtil.sessionFactory.close();
    		}
    		return null;
    	}


    2、limit查询

    		Session session = HibernateUtil.currentSession();
    		try {
    			//from后面是对象,不是表名
    			String hql="from Weibo as weibo";//使用命名参数,推荐使用,易读。
    			Query query = session.createQuery(hql);
    			query.setFirstResult(k);  
                query.setMaxResults(1);
    			List<Weibo> list = (List<Weibo>)query.list();
    			return list;
    		} catch (Exception e) {
    			// TODO: handle exception
    			e.printStackTrace();
    			System.err.println("select failed!!!!!!");
    		}finally{
    			HibernateUtil.closeSession();
    			HibernateUtil.sessionFactory.close();
    		}
    		return null;
    	}


    3、sql查询

    	public List<String> selectOne1(int k){
    		Session session = HibernateUtil.currentSession();
    		try {
    			String sql = "select image from t_weiboo limit 5,1;";
    			Query query = session.createSQLQuery(sql);
    			List<String> list = query.list();
    			return list;
    		} catch (Exception e) {
    			// TODO: handle exception
    			e.printStackTrace();
    			System.err.println("select failed!!!!!!");
    		}finally{
    			HibernateUtil.closeSession();
    			HibernateUtil.sessionFactory.close();
    		}
    		return null;
    	}

    4、id查询

    	public void update1() {
    		
    		Session session = HibernateUtil.currentSession();
    		Transaction tx = session.beginTransaction();
    		Weibo wb = (Weibo) session.get(Weibo.class, 3);
    		wb.setImagePath("");
    		session.update(wb);
    		tx.commit();
    
    	}

    5、唯一结果查询

    <span style="white-space:pre">	</span>public Weibo selectOne1(int k){
    		Session session = HibernateUtil.currentSession();
    		try {
    			//from后面是对象,不是表名
    			String hql="from Weibo as weibo";//使用命名参数,推荐使用,易读。
    			Query query = session.createQuery(hql);
    			query.setFirstResult(k);
                query.setMaxResults(1);
    			Weibo weibo = (Weibo)query.uniqueResult();
    			return weibo;
    		} catch (Exception e) {
    			// TODO: handle exception
    			e.printStackTrace();
    			System.err.println("select failed!!!!!!");
    		}finally{
    			HibernateUtil.closeSession();
    			HibernateUtil.sessionFactory.close();
    		}
    		return null;
    	}



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  • 原文地址:https://www.cnblogs.com/yan456jie/p/5369454.html
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