java - HibernateSessionFactory 类不会更改数据库中的数据

Question

在我们的应用程序中，我们有一个 HibernateSessionFactory 类，用于打开和关闭连接。一切都很好，但是当我们更新数据库中的数据时，它在我们的应用程序中并没有改变。不幸的是，我们从数据库中看到了旧数据。我该如何解决这个问题？

public class HibernateSessionFactory {

    private static final ThreadLocal threadLocal = new ThreadLocal();
    private static org.hibernate.SessionFactory sessionFactory;

    private static Configuration configuration = new Configuration();
    private static ServiceRegistry serviceRegistry;

    private static final Logger log = Logger.getLogger(
                                        HibernateSessionFactory.class);

    static {
        try {
            configuration.configure();
            serviceRegistry = new ServiceRegistryBuilder()
                        .applySettings(configuration.getProperties())
                        .buildServiceRegistry();
            sessionFactory = configuration.buildSessionFactory(serviceRegistry);
        } catch (Exception e) {
            log.error("Error Creating SessionFactory", e);
        }
    }

    private HibernateSessionFactory() {}

    public static Session getSession() throws HibernateException {
        Session session = (Session) threadLocal.get();
        if (session == null || !session.isOpen()) {
            if (sessionFactory == null) {
                rebuildSessionFactory();
            }
            session = (sessionFactory != null) ?
                        sessionFactory.openSession() : null;

            threadLocal.set(session);
        }
        return session;
    }

    public static void rebuildSessionFactory() {

        try {
            configuration.configure();
            serviceRegistry = new ServiceRegistryBuilder()
                        .applySettings(configuration.getProperties())
                        .buildServiceRegistry();
            sessionFactory = configuration.buildSessionFactory(serviceRegistry);
        } catch (Exception e) {
            log.error("Error Creating SessionFactory", e);
        }
    }

    public static void closeSession() throws HibernateException {
        Session session = (Session) threadLocal.get();
        threadLocal.set(null);
        if (session != null) {
            session.flush();
            session.close();

        }
    }

    public static org.hibernate.SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    public static Configuration getConfiguration() {
        return configuration;
    }

}

.

@SuppressWarnings("unchecked")
public List<Tauthor> getAuthors() throws HibernateException {
    log.debug("getting all authors");
    Query queryObject = null;
    List<Tauthor> authors = null;
    Session session = HibernateSessionFactory.getSession();
    try {
        String queryString = "from Tauthor";
        queryObject = session.createQuery(queryString);
        authors = queryObject.list();
    } catch (HibernateException e) {
        log.error("get all authors failed", e);
        throw e;
    } finally {
        HibernateSessionFactory.closeSession();
    }
    return authors;
}

Answer 1

您尚未共享将数据写入数据库的代码。如果没有这个，我只能想到为什么您的数据输出是旧数据而不是新数据的几个原因:

1. 您的交易尚未提交。
2. 在您查询数据时，Hibernate 尚未写入数据库。
3. Hibernate 的缓存尚未更新，这导致查询返回旧数据。

您应该使用数据库开发工具验证数据是否已写入数据库，并尝试禁用所有 hibernate 缓存以查看结果是否发生变化。