Hibernate 5.2版本 - >很多查询方法不推荐使用？ [英] Hibernate 5.2 version -> A lot of Query methods deprecate?

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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