java - Hibernate Session Factory 需要很长时间才能加载

Question

我已经创建了自定义 session 工厂提供程序类。我在哪里设置 hibernate 属性和带注释的类。我有超过 100 个带注释的类。当我登录到应用程序时，加载 session 工厂需要很长时间。有什么办法可以解决这个问题，或者我做错了什么？请帮助我。

public class SessionFatoryProvider {

    public void setNewSessionFactory(String uname,String password,HttpSession hs){

        String jdbcUrl = Constants.DB_URL+Constants.DB;
        java.util.Properties hibernateProperties = new java.util.Properties();
        hibernateProperties.setProperty("hibernate.connection.driverClassNames", "com.mysql.jdbc.Driver");
        hibernateProperties.setProperty("hibernate.connection.url", jdbcUrl);
        hibernateProperties.setProperty("hibernate.connection.username", uname);
        hibernateProperties.setProperty("hibernate.connection.password", password);
        hibernateProperties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");
        hibernateProperties.setProperty("hibernate.show_sql", "true");
        hibernateProperties.setProperty("hibernate.hbm2ddl.auto","none");
        hibernateProperties.setProperty("current_session_context_class","org.hibernate.context.spi.AbstractCurrentSessionContext");
        hibernateProperties.setProperty("hibernate.cache.use_second_level_cache","false");
        hibernateProperties.setProperty("hibernate.cache.use_query_cache","false");

        LocalSessionFactoryBean slfb = new LocalSessionFactoryBean();
        slfb.setHibernateProperties(hibernateProperties);
        slfb.setPackagesToScan("com.orb.bean"); //My entity class package

        try {
            slfb.afterPropertiesSet();
         } catch (Exception e) {                      
             e.printStackTrace();
         }

        SessionFactory mySessionFactory = slfb.getObject();
        HibernateTransactionManager transactionManager = new HibernateTransactionManager();
        transactionManager.setSessionFactory(mySessionFactory);

        hs.setAttribute("HibernateTransactionManager", transactionManager); //Here I am setting hibernate transaction manager in session

    }

}

Answer 1

因为你已经在使用 Spring(例如 LocalSessionFactoryBean )，你应该 configure the application context这样 LocalSessionFactoryBean 就是一个单例。

因此无需手动创建 SessionFactory。这也适用于事务管理配置。

根据reference documentation , SessionFactory 是一个昂贵的对象，因为它是一个线程安全的对象，所以它应该是一个单例:

A SessionFactory is an expensive-to-create, threadsafe object, intended to be shared by all application threads. It is created once, usually on application startup, from a Configuration instance.