如果查询返回多个值用list()方法

1. publicvoidtestQuery(){
2. Configurationconfig=newConfiguration().configure();
3. SessionFactoryfactory=config.buildSessionFactory();//创建SessionFactory
4. Sessionsession=factory.openSession();//创建Session
5. session.beginTransaction();//开始事务
7. Queryquery=session.createQuery(“fromStudent”);
8. Listlist=query.list();//用list方法返回多个值
9. //Listlist=session.createQuery(“fromStudent”).list();
10. for(inti=0;i<list.size();i++){
11. Studentstudent=(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();//提交事务
20. session.close();//关闭Session
21. }

当确定返回的实例只有一个或者null时 用uniqueResult()方法

1. publicvoidtestGet(){
2. Configurationconfig=newConfiguration().configure();
3. SessionFactoryfactory=config.buildSessionFactory();
4. Sessionsession=factory.openSession();
5. session.beginTransaction();
7. Queryquery=session.createQuery(“fromStudentswheres.id=?”);
8. query.setString(0,“2”);
9. Studentstudent=(Student)query.uniqueResult();//当确定返回的实例只有一个或者null时用uniqueResult()方法
10. //Studentstudent=(Student)session.createQuery(“fromStudentswheres.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. }