想问下以下的2种查询方式有什么区别？

Java code
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public Topic queryTopicByID(int topicID) {    //根据ID查询主题
    Topic topic = (Topic) getHibernateTemplate().get(Topic.class, topicID);
    return topic;
}


Java code
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public Topic queryTopicByID(int topicID) {    //根据ID查询主题
        List<Topic> topic = getHibernateTemplate().find("from Topic where topicID = ?",topicID);
        if(topic.size() == 0) {      
            return null;
        }else {
            return topic.get(0);   
        }
    }