get方法的doc解释:
/** * Return the persistent instance of the given entity class with the given identifier, * or null if there is no such persistent instance. (If the instance is already associated * with the session, return that instance. This method never returns an uninitialized instance.) * * @param entityType The entity type * @param id an identifier * * @return a persistent instance or null */ <T> T get(Class<T> entityType, Serializable id);
load方法的doc解释:
/** * Return the persistent instance of the given entity class with the given identifier, * assuming that the instance exists. This method might return a proxied instance that * is initialized on-demand, when a non-identifier method is accessed. * You should not use this method to determine if an instance exists (use get() * instead). Use this only to retrieve an instance that you assume exists, where non-existence * would be an actual error. * * @param theClass a persistent class * @param id a valid identifier of an existing persistent instance of the class * * @return the persistent instance or proxy */ <T> T load(Class<T> theClass, Serializable id);