Hibernate之Query接口的uniqueResult()方法
public void testQuery(){Configuration config = new Configuration().configure();SessionFactory factory = config.buildSessionFactory(); //创建SessionFactorySession session = factory.openSession(); //创建Sessionsession.beginTransaction(); //开始事务Query query = session.createQuery("from Student");List list = query.list(); // 用list方法返回多个值//List list = session.createQuery("from Student").list();for(int i=0;i<list.size();i++){Student student = (Student)list.get(i);System.out.print(student.getId()+" ");System.out.print(student.getName()+" ");System.out.print(student.getSex()+" ");System.out.print(student.getBirthday());System.out.println();}session.getTransaction().commit(); //提交事务 session.close(); //关闭Session}
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?当确定返回的实例只有一个或者null时 用uniqueResult()方法
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public void testGet(){Configuration config = new Configuration().configure();SessionFactory factory = config.buildSessionFactory();Session session = factory.openSession();session.beginTransaction();Query query = session.createQuery("from Student s where s.id=?");query.setString(0, "2");Student student = (Student)query.uniqueResult(); //当确定返回的实例只有一个或者null时 用uniqueResult()方法//Student student = (Student)session.createQuery("from Student s where s.id=?").setString(0,"5").uniqueResult();System.out.println(student.getName());System.out.println(student.getBirthday());session.getTransaction().commit();session.close();}?