Hibernate之Query接口的uniqueResult()方法
阿新 • • 發佈:2017-09-03
size 有一個 span factor reat list() println ont begin
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
6
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 }
18
19 session.getTransaction().commit(); //提交事務
20 session.close(); //關閉Session
21 }
當確定返回的實例只有一個或者null時 用uniqueResult()方法
1 public void testGet(){
2 Configuration config = new Configuration().configure();
3 SessionFactory factory = config.buildSessionFactory();
4 Session session = factory.openSession();
5 session.beginTransaction();
6
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();
11
12 System.out.println(student.getName());
13 System.out.println(student.getBirthday());
14
15
16 session.getTransaction().commit();
17 session.close();
18 }
Hibernate之Query接口的uniqueResult()方法