水溼檢索DB HQL

Question

有了這個代碼項目：

Session session = HibernateUtil.getSessionFactory().getCurrentSession(); 
session.beginTransaction(); 
Query query = session.createQuery("from DBUser where id=1"); 
    for(Iterator it=query.iterate();it.hasNext();){ 
    Object[] row = (Object[]) it.next(); 
    System.out.println("ID: " + row[0]); 
    System.out.println("Name: " + row[1]); 
    System.out.println("Amount: " + row[2]); 
} 

發生一個錯誤：java.lang.ClassCastException: com.mycompany.app.DBUser cannot be cast to [Ljava.lang.Object;

有可能是更簡單的方法來檢索表中的單個元素？

Answer 1

hql在這種情況下返回映射類型。您的代碼應該如下所示：

Session session = HibernateUtil.getSessionFactory().getCurrentSession(); 
session.beginTransaction(); 
Query query = session.createQuery("from DBUser where id=1"); 
    for(Iterator it=query.iterate();it.hasNext();){ 
    DBUser row = (DBUser) it.next(); 
    System.out.println("ID: " + row.getId()); 
    System.out.println("Name: " + row.getName()); 
    System.out.println("Amount: " + row.getAmount()); 
}