ConversationDataAccessObject.java 文件源码

public static Conversations merge (Conversations conversation) {
    if (conversation != null) {
        EntityManager em = EMFUtil.getEMFactory().createEntityManager();
        EntityTransaction trans = em.getTransaction();
        try {
            trans.begin();
            conversation = em.merge(conversation);
            trans.commit();
            return conversation;
        } catch (Exception e) {
            trans.rollback();
            e.printStackTrace();
            return null;
        } finally {
            em.close();
        }
    }
    return null;
}