java - 将 Hibernate 查询结果存储到 Hashmap 中

Question

我想将 HQL 查询结果的名称和 ID 存储到 Hashmap 中。这是我的代码。有没有更好的方法呢？

    String hql = "FROM Student";
    Session session = HibernateUtil.getSessionFactory().openSession();
    Query query = session.createQuery(hql);
    List queryResults = query.list();
    List<Student> result = new ArrayList<Student>();

    Iterator it = queryResults.iterator();
    while (it.hasNext()) {
        Student student = (Student) it.next();
        result.add(student);
    }
    Map mapresult = new LinkedHashMap<Integer,String>();

    for (Student Maprslt : result)
        mapresult.put(Maprslt.getId(), Maprslt.getName());

Answer 1

您可以将它们全部放在一个 foreach 循环中，该循环旨在循环遍历 Iterable 或数组。

String hql = "FROM Student";
Session session = HibernateUtil.getSessionFactory().openSession();
Query query = session.createQuery(hql);
List queryResults = query.list();

Map<Integer,String> mapresult = new LinkedHashMap<>();
for (Object obj : queryResults) {
    Student student = (Student) obj;
    mapresult.put(student.getId(), student.getName());
}