java - 将ejb代码更改为EntityManager代码

Question

public class EjB3Configuration {

    private Ejb3Configuration configuration = null;

    protected PersistenceUnitInfo persistenceUnitInfo;

    public Ejb3Configuration getConfiguration() {
        synchronized(this) {
            if (configuration == null) {
                Ejb3Configuration temp = new Ejb3Configuration();
                String previousValue = persistenceUnitInfo.getProperties().getProperty("hibernate.hbm2ddl.auto");
                persistenceUnitInfo.getProperties().setProperty("hibernate.hbm2ddl.auto", "none");
                configuration = temp.configure(persistenceUnitInfo, new HashMap());
                configuration.getHibernateConfiguration().buildSessionFactory();
                if (previousValue != null) {
                    persistenceUnitInfo.getProperties().setProperty("hibernate.hbm2ddl.auto", previousValue);
                }
            }
        }
        return configuration;
    }

    public PersistenceUnitInfo getPersistenceUnitInfo() {
        return persistenceUnitInfo;
    }

    public void setPersistenceUnitInfo(PersistenceUnitInfo persistenceUnitInfo) {
        this.persistenceUnitInfo = persistenceUnitInfo;
    }

}

我对 ejb3 的调用如下所示。由于 ejb3 已从 4.3.10.Final hibernate 版本中删除，我如何将上述代码重构为实体管理器。

public PersistentClass getPersistentClass(final String targetClassName) {
        return ejb3Configuration.getConfiguration().getClassMapping(targetClassName);
    }

我的电话

Answer 1

要以编程方式创建EntityManagerFactory，您可以这样做:

Properties properties = getProperties();
EntityManagerFactory emf = Persistence.createEntityManagerFactory("myPersistenceUnit", properties);