comxpp 2011-05-06
hibernate的懒加载问题时常会困扰着我们, 今天发现了hibernate自身也提供一些解决办法
Hibernate.initialize(company.getUsers()); 这样就加载了users集合
但不支持递归加载
it is not guaranteed that the elements INSIDE the collection will be initialized/materialized
假如这时session关闭了 会报错
真正解决懒加载还是应该在类的设计 xml文件的配置上下功夫
源码:
/** * Force initialization of a proxy or persistent collection. * <p/> * Note: This only ensures intialization of a proxy object or collection; * it is not guaranteed that the elements INSIDE the collection will be initialized/materialized. * * @param proxy a persistable object, proxy, persistent collection or <tt>null</tt> * @throws HibernateException if we can't initialize the proxy at this time, eg. the <tt>Session</tt> was closed */ public static void initialize(Object proxy) throws HibernateException { if ( proxy == null ) { return; } else if ( proxy instanceof HibernateProxy ) { ( ( HibernateProxy ) proxy ).getHibernateLazyInitializer().initialize(); } else if ( proxy instanceof PersistentCollection ) { ( ( PersistentCollection ) proxy ).forceInitialization(); } } /** * Check if the proxy or persistent collection is initialized. * * @param proxy a persistable object, proxy, persistent collection or <tt>null</tt> * @return true if the argument is already initialized, or is not a proxy or collection */ public static boolean isInitialized(Object proxy) { if ( proxy instanceof HibernateProxy ) { return !( ( HibernateProxy ) proxy ).getHibernateLazyInitializer().isUninitialized(); } else if ( proxy instanceof PersistentCollection ) { return ( ( PersistentCollection ) proxy ).wasInitialized(); } else { return true; } }