大家好,又见面了,我是你们的朋友全栈君。
如果查询返回多个值用list()方法
- public void testQuery(){
- Configuration config = new Configuration().configure();
- SessionFactory factory = config.buildSessionFactory(); //创建SessionFactory
- Session session = factory.openSession(); //创建Session
- session.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
- }
当确定返回的实例只有一个或者null时 用uniqueResult()方法
- 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();
- }
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