Hibernate的joinfecth用法【一不懂用法，二不懂目的】[后面还有四个实例不做熬述]（二十九）

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//join fetch@Testpublic void testQuery4() {Session session = sf.openSession();session.beginTransaction();//List<Topic> topics = (List<Topic>)session.createCriteria(Topic.class).list();List<Topic> topics = (List<Topic>)session.createQuery("from Topic t left join fetch t.category c").list();for(Topic t : topics) {System.out.println(t.getId() + "-" + t.getTitle());System.out.println(t.getCategory().getName());}session.getTransaction().commit();session.close();}