@Test public void testHQL_01() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session.createQuery("from Category"); List<Category> categorys = (List<Category>) q.list(); for (Category c : categorys) { System.out.println(c.getId() + "--" + c.getName()); } session.getTransaction().commit(); } @Test public void testHQL_02() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session.createQuery("from Category c where c.name > 'c5'"); List<Category> categorys = (List<Category>) q.list(); for (Category c : categorys) { System.out.println(c.getId() + "--" + c.getName()); } session.getTransaction().commit(); } @Test public void testHQL_03() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session.createQuery("from Category c order by c.name desc"); List<Category> categorys = (List<Category>) q.list(); for (Category c : categorys) { System.out.println(c.getId() + "--" + c.getName()); } session.getTransaction().commit(); } @Test public void testHQL_04() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session.createQuery("select distinct c from Category c order by c.name desc"); List<Category> categorys = (List<Category>) q.list(); for (Category c : categorys) { System.out.println(c.getId() + "--" + c.getName()); } session.getTransaction().commit(); } @Test public void testHQL_05() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session .createQuery("from Category c where c.id > :min and c.id < :max"); q.setParameter("min", 3); q.setParameter("max", 8); List<Category> categorys = (List<Category>) q.list(); for (Category c : categorys) { System.out.println(c.getId() + "--" + c.getName()); } session.getTransaction().commit(); } @Test public void testHQL_06() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session .createQuery("from Category c where c.id > ? and c.id < ?"); q.setParameter(0, 3); q.setParameter(1, 8); List<Category> categorys = (List<Category>) q.list(); for (Category c : categorys) { System.out.println(c.getId() + "--" + c.getName()); } session.getTransaction().commit(); } /** * 分页显示 */ @Test public void testHQL_07() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session .createQuery("select distinct c from Category c order by c.name desc"); q.setMaxResults(3); q.setFirstResult(1); List<Category> categorys = (List<Category>) q.list(); for (Category c : categorys) { System.out.println(c.getId() + "--" + c.getName()); } session.getTransaction().commit(); } @Test public void testHQL_08() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session .createQuery("select c.id , c.name from Category c order by c.name desc"); List<Object[]> categorys = (List<Object[]>) q.list(); for (Object b[] : categorys) { System.out.println(b[0] + "--" + b[1]); } session.getTransaction().commit(); } /** * 版块id=1的所有帖子 */ @Test public void testHQL_09() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session .createQuery("from Msg m where m.Topic.Category.id = 1"); List<Object[]> categorys = (List<Object[]>) q.list(); for (Object b[] : categorys) { System.out.println(b[0] + "--" + b[1]); } session.getTransaction().commit(); } @Test public void testHQL_10() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session .createQuery("select new chengyi.hibernate.MsgInfo(m.id,m.count," + "m.topic.title,m.topic.category.name) from Msg"); for (Object o : q.list()) { MsgInfo m = (MsgInfo) o; System.out.println(m.getCount()); } session.getTransaction().commit(); } // 动手测试left right join // 为什么不能直接写Category名,而必须写t.category // 因为有可能存在多个成员变量(同一个类),需要指明用哪一个成员变量的连接条件来做连接 @Test public void testHQL_11() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session .createQuery("select t.title, c.name from Topic t join t.category c"); for (Object o : q.list()) { Object ob[] = (Object[]) o; System.out.println(ob[0] + "-" + ob[1]); } session.getTransaction().commit(); } /** * count(*) 返回的就只有一个Long类型的结果 */ @Test public void testHQL_12() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session.createQuery("select count(*) from Msg m"); Long count = (Long) q.uniqueResult(); System.out.println(count); session.getTransaction().commit(); } @Test public void testHQL_13() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session.createQuery("from Msg m where m.id between 3 and 5"); for (Object o : q.list()) { Msg m = (Msg) o; System.out.println(m.getId() + "-" + m.getCount()); } session.getTransaction().commit(); } @Test public void testHQL_14() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session.createQuery("from Msg m where m.id in (3,4, 5)"); for (Object o : q.list()) { Msg m = (Msg) o; System.out.println(m.getId() + "-" + m.getCount()); } session.getTransaction().commit(); } @Test public void testHQL_15() { testSave(); Session session = sf.getCurrentSession(); session.beginTransaction(); Query q = session.createQuery("from Msg m where m.count is not null"); for (Object o : q.list()) { Msg m = (Msg) o; System.out.println(m.getId() + "-" + m.getCount()); } session.getTransaction().commit(); } @Test public void testHQL_16() { testSave(); Session session = sf.openSession(); session.beginTransaction(); Query q = session .createQuery("select max(m.id), min(m.id), avg(m.id), sum(m.id) from Msg m"); Object[] o = (Object[]) q.uniqueResult(); System.out.println(o[0] + "-" + o[1] + "-" + o[2] + "-" + o[3]); session.getTransaction().commit(); session.close(); } //is empty and is not empty @Test public void testHQL_20() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.createQuery("from Topic t where t.msgs is empty"); for(Object o : q.list()) { Topic t = (Topic)o; System.out.println(t.getId() + "-" + t.getTitle()); } session.getTransaction().commit(); session.close(); } @Test public void testHQL_21() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.createQuery("from Topic t where t.title like '%5'"); for(Object o : q.list()) { Topic t = (Topic)o; System.out.println(t.getId() + "-" + t.getTitle()); } session.getTransaction().commit(); session.close(); } @Test public void testHQL_22() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.createQuery("from Topic t where t.title like '_5'"); for(Object o : q.list()) { Topic t = (Topic)o; System.out.println(t.getId() + "-" + t.getTitle()); } session.getTransaction().commit(); session.close(); } //不重要 @Test public void testHQL_23() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.createQuery("select lower(t.title)," + "upper(t.title)," + "trim(t.title)," + "concat(t.title, '***')," + "length(t.title)" + " from Topic t "); for(Object o : q.list()) { Object[] arr = (Object[])o; System.out.println(arr[0] + "-" + arr[1] + "-" + arr[2] + "-" + arr[3] + "-" + arr[4] + "-"); } session.getTransaction().commit(); session.close(); } @Test public void testHQL_24() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.createQuery("select abs(t.id)," + "sqrt(t.id)," + "mod(t.id, 2)" + " from Topic t "); for(Object o : q.list()) { Object[] arr = (Object[])o; System.out.println(arr[0] + "-" + arr[1] + "-" + arr[2] ); } session.getTransaction().commit(); session.close(); } @Test public void testHQL_25() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.createQuery("select current_date, current_time, current_timestamp, t.id from Topic t"); for(Object o : q.list()) { Object[] arr = (Object[])o; System.out.println(arr[0] + " | " + arr[1] + " | " + arr[2] + " | " + arr[3]); } session.getTransaction().commit(); session.close(); } @Test public void testHQL_26() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.createQuery("from Topic t where t.createDate < :date"); q.setParameter("date", new Date()); for(Object o : q.list()) { Topic t = (Topic)o; System.out.println(t.getTitle()); } session.getTransaction().commit(); session.close(); } @Test public void testHQL_27() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.createQuery("select t.title, count(*) from Topic t group by t.title") ; for(Object o : q.list()) { Object[] arr = (Object[])o; System.out.println(arr[0] + "|" + arr[1]); } session.getTransaction().commit(); session.close(); } @Test public void testHQL_28() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.createQuery("select t.title, count(*) from Topic t group by t.title having count(*) >= 1") ; for(Object o : q.list()) { Object[] arr = (Object[])o; System.out.println(arr[0] + "|" + arr[1]); } session.getTransaction().commit(); session.close(); } @Test public void testHQL_29() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.createQuery("from Topic t where t.id < (select avg(t.id) from Topic t)") ; for(Object o : q.list()) { Topic t = (Topic)o; System.out.println(t.getTitle()); } session.getTransaction().commit(); session.close(); } @Test public void testHQL_30() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.createQuery("from Topic t where t.id < ALL (select t.id from Topic t where mod(t.id, 2)= 0) ") ; for(Object o : q.list()) { Topic t = (Topic)o; System.out.println(t.getTitle()); } session.getTransaction().commit(); session.close(); } //用in 可以实现exists的功能 //但是exists执行效率高 @Test public void testHQL_31() { Session session = sf.openSession(); session.beginTransaction();// t.id not in (1) Query q = session.createQuery("from Topic t where not exists (select m.id from Msg m where m.topic.id=t.id)") ; // Query q = session.createQuery("from Topic t where exists (select m.id from Msg m where m.topic.id=t.id)") ; for(Object o : q.list()) { Topic t = (Topic)o; System.out.println(t.getTitle()); } session.getTransaction().commit(); session.close(); } //update and delete //规范并没有说明是不是要更新persistent object,所以如果要使用,建议在单独的trasaction中执行 @Test public void testHQL_32() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.createQuery("update Topic t set t.title = upper(t.title)") ; q.executeUpdate(); q = session.createQuery("from Topic"); for(Object o : q.list()) { Topic t = (Topic)o; System.out.println(t.getTitle()); } session.createQuery("update Topic t set t.title = lower(t.title)") .executeUpdate(); session.getTransaction().commit(); session.close(); } //不重要 @Test public void testHQL_33() { Session session = sf.openSession(); session.beginTransaction(); Query q = session.getNamedQuery("topic.selectCertainTopic"); q.setParameter("id", 5); Topic t = (Topic)q.uniqueResult(); System.out.println(t.getTitle()); session.getTransaction().commit(); session.close(); } //Native(了解) @Test public void testHQL_34() { Session session = sf.openSession(); session.beginTransaction(); SQLQuery q = session.createSQLQuery("select * from category limit 2,4").addEntity(Category.class); List<Category> categories = (List<Category>)q.list(); for(Category c : categories) { System.out.println(c.getName()); } session.getTransaction().commit(); session.close(); }