Hibernate之Query介面的uniqueResult()方法

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標籤:tran   一個   span   返回   多個   hibernate   有一個   out   creat   

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(); //建立SessionFactory    4         Session session = factory.openSession();        //建立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     } 

 

 

 

 

當確定返回的執行個體只有一個或者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();  //當確定返回的執行個體只有一個或者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介面的uniqueResult()方法

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