一,比较merge与update的区别 首先, merge作用大致相当于saveorupdate这个方法, 即有唯一性标识, 则运行save, 没有则运行update     下面来比较2者的区别, update(object), 方法运行后, object是持久化状态, 而Object obj = merge(object), 方法运行后, object是脱管状态, obj是持久化状态

异常：(error) MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details abou