redis存储用户评论
要做一个评论系统，
每个文章对应一个aid，下面有评论，
存储这些评论有2个方案
1是分开存储，每条评论有要给cid，为一条hash commentinfo:$cid {cid:$cid,time:XXX.author:xxx......}。每个文章一个set commentlist:$aid [cid1,cid2,cid3.....]。
2是每个文章一个sort set conmentlist:$aid ,其中score是时间戳，value是一个完整的json数据字符串。
那么那种存储方式更好呢
回复内容：
要做一个评论系统，
每个文章对应一个aid，下面有评论，
存储这些评论有2个方案
1是分开存储，每条评论有要给cid，为一条hash commentinfo:$cid {cid:$cid,time:XXX.author:xxx......}。每个文章一个set commentlist:$aid [cid1,cid2,cid3.....]。
2是每个文章一个sort set conmentlist:$aid ,其中score是时间戳，value是一个完整的json数据字符串。
那么那种存储方式更好呢
第二种,传输数据少
直接用List不是更好么，这样每次插入都是单条数据，取的时候可以选择范围段以及总数，也就能实现翻页的功能了。具体如下：
<code>以comments:id作为key， 用lpush压入数据， 用lrange来取值。 </code>
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