Question

我正在尝试从hibernate 3迁移到5.2.3，并且有许多旧代码调用org.hibernate.SessionFactory.getAllClassMetadata，这个方法在hibernate 5中已被弃用，它建议使用SessoinFactory.getMetaModel()，但是当我尝试调用这个方法，它似乎也被弃用了，我继续研究，找不到任何其他建议使用的方法，任何人都可以帮忙吗？如果你能提供详细的用法，我们将非常感激，谢谢。

以下是getAllClassMetadata的用法：

@Override
    public Collection<ModelSpecificationSummary> findAllModelSpecificationSummaries() throws RepositoryException {
        List<ModelSpecificationSummary> summaries = new ArrayList<ModelSpecificationSummary>();
        try {
            Query query = session.createQuery(
                            "selecc.name, spec.class from " + Specification.class.getSimpleName() + " spec");
            List<Object[]> list = query.list();

            SingleTableEntityPersister metadata = (SingleTableEntityPersister) session.getSessionFactory()
                            .getAllClassMetadata()
                            .get(Specification.class.getName());
            for (Object[] o : list) {
                Long id = (Long) o[0];
                String name = (String) o[1];
                String discriminator = (String) o[2];

                Class<? extends ModelSpecification> specificationClass = lookupSpecificationSubclass(metadata, discriminator);

                ModelSpecificationSummary summary = new ModelSpecificationSummary(id, name, specificationClass);
                summaries.add(summary);
            }

            return summaries;
        }
        catch (HibernateException he) {
            throw new RepositoryException(he);
        }
    }

和lookupSpecificationSubclass类：

 private Class<? extends ModelSpecification> lookupSpecificationSubclass(SingleTableEntityPersister metadata,
                                                                            String discriminator)
                    throws RepositoryException {
        Class<? extends ModelSpecification> specificationClass = null;

        String subclass = metadata.getSubclassForDiscriminatorValue(discriminator);
        if (subclass != null) {
            try {
                specificationClass = (Class<? extends ModelSpecification>) Class.forName(subclass);
            }
            catch (ClassNotFoundException e) {
                throw new RepositoryException("Invalid class found for specification " + discriminator, e);
            }
        }
        else {
            throw new RepositoryException("No class found for specification " + discriminator);
        }
        return specificationClass;
    }

所以我想如何用getAllClassMetadata()

替换EntityManagerFactory.getMetamodel()

Answer 1

根据SessionFactory#getAllClassMetadata文件：

已过时。使用EntityManagerFactory.getMetamodel()中的描述符代替

请注意，它建议使用未被弃用的EntityManagerFactory#getMetamodel。您可以在网上找到许多解释如何使用它的示例，或者您可以询问具体问题，了解您希望用它实现的目标。

Hibernate 5.2.3不再支持SessionFactory.getAllClassMetadata

1 个答案: