Hibernate之Query接口的uniqueResult()方法

如果查詢返回多個值用list()方法

1. public void testQuery(){
2. Configuration config = new Configuration().configure();
3. SessionFactory factory = config.buildSessionFactory(); //創建SessionFactory
4. Session session = factory.openSession(); //創建Session
5. session.beginTransaction(); //開始事務
7. Query query = session.createQuery("from Student");
8. List list = query.list(); // 用list方法返回多個值
9. //List list = session.createQuery("from Student").list();
10. for(int i=0;i<list.size();i++){
11. Student student = (Student)list.get(i);
12. System.out.print(student.getId()+" ");
13. System.out.print(student.getName()+" ");
14. System.out.print(student.getSex()+" ");
15. System.out.print(student.getBirthday());
16. System.out.println();
17. }
19. session.getTransaction().commit(); //提交事務
20. session.close(); //關閉Session
21. }

1. public void testGet(){
2. Configuration config = new Configuration().configure();
3. SessionFactory factory = config.buildSessionFactory();
4. Session session = factory.openSession();
5. session.beginTransaction();
7. Query query = session.createQuery("from Student s where s.id=?");
8. query.setString(0, "2");
9. Student student = (Student)query.uniqueResult(); //當確定返回的實例只有一個或者null時 用uniqueResult()方法
10. //Student student = (Student)session.createQuery("from Student s where s.id=?").setString(0,"5").uniqueResult();
12. System.out.println(student.getName());
13. System.out.println(student.getBirthday());
16. session.getTransaction().commit();
17. session.close();
18. }