Spring + hibernate 数据更新问题？

public Organization merge(Organization detachedInstance) {
     log.debug("merging Organization instance");
         try {
          Organization result = (Organization) getHibernateTemplate()
                     .merge(detachedInstance);
             log.debug("merge successful");
             return result;
         } catch (RuntimeException re) {
             log.error("merge failed", re);
             throw re;
         }
 } copyright dedecms

 public void saveOrUpdate(Organization transientInstance) {
    log.debug("saveOrUpdate Organization instance");
         try {                    
             getHibernateTemplate().saveOrUpdate(transientInstance);
             log.debug("save successful");
         } catch (RuntimeException re) {
             log.error("save failed", re);
             throw re;
         }  
 }

上面2种方法都是什么含义？有什么区别？ dedecms.com

为什么我修改一条数据时，它会保持以前数据的同时，自动添加一条新的数据！

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  copyright dedecms

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