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问题描述



我试图获取所有管理员的名字和姓氏列表。



在我的下面的代码中有两个警告。我已经尝试在网上搜索很多。

1)查询是一种原始类型。



2)来自类型Query的方法list()已被弃用。

  public List< Object> loadAllAdmins(){
List< Object> allAdmins = new ArrayList< Object>();
尝试{
HibernateUtil.beginTransaction();

Query q = currentSession.createQuery(从AdminBean admin选择admin admin,firstname,admin.lastName);

allAdmins = q.list();

HibernateUtil.commitTransaction();
} catch(HibernateException ex){
System.out.println(List< AdminBean> loadAllPersons:HibernateException);
}
返回allAdmins;
}

但是我在网上看到了类似这样的示例代码。我应该如何解决这两个问题?



更新

建议使用Criteria。它还表示list()方法不适合Criteria ...似乎很多方法都不适用于Query和Criteria,包括uniqueResult()和其他方法...任何建议我应该如何替换它们?

解决方案
  public List< Admin> getAdmins(){
List< Admin> AdminList = new ArrayList< Admin>();
会话会话= factory.openSession();
for(Object oneObject:session.createQuery(FROM Admin)。getResultList()){
AdminList.add((Admin)oneObject);
}
session.close();
返回AdminList;
}

警告来自Type Inference。



我有类似的问题。然而,我找到了一个没有SuppressWarnings的解决方案。






最近,我发现了一种更简单的方法来编码相同的东西

  public List< Admin> getAdmins(){
Session session = factory.openSession();
TypedQuery< Admin> query = session.createQuery(FROM Admin);
列表<管理> result = query.getResultList();
session.close();
返回结果;
}

希望它有帮助。


I'm new to Hibernate.

I'm trying to get a list of first name and last name of all administrators.

There are two warnings in my following code. I already tried to search a lot online.

1) Query is a raw type. References to generic type Query should be parameterized.

2) The method list() from the type Query is deprecated.

public List<Object> loadAllAdmins() {
                List<Object> allAdmins = new ArrayList<Object>();
                try {
                        HibernateUtil.beginTransaction();

                        Query q = currentSession.createQuery("SELECT admin.firstName, admin.lastName from AdminBean admin");

                        allAdmins= q.list();

                        HibernateUtil.commitTransaction();
                } catch (HibernateException ex) {
                        System.out.println("List<AdminBean> loadAllPersons: HibernateException");
                }
                return allAdmins;
        }

But I see sample code like this all over the web. How should I solve these two problems?

Update

I just tried to use Criteria as suggested. It also says the list() method is deprecate for Criteria... It seems that a lot of methods are deprecate for both Query and Criteria, including uniqueResult() and others... Any suggestion how I should replace them?

解决方案
public List<Admin> getAdmins() {
    List<Admin> AdminList = new ArrayList<Admin>();
    Session session = factory.openSession();
    for (Object oneObject : session.createQuery("FROM Admin").getResultList()) {
        AdminList.add((Admin)oneObject);
    }
    session.close();
    return AdminList;
}

The warnings came from "Type Inference".

I had the similar problem. However, I found a solution without "SuppressWarnings".


Recently, I found out a shorter way to code the same things without type inference.

public List<Admin> getAdmins() {
    Session session = factory.openSession();
    TypedQuery<Admin> query = session.createQuery("FROM Admin");
    List<Admin> result = query.getResultList();
    session.close();
    return result;
}

Hope it helps.

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08-13 10:05