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HomeBackend DevelopmentPHP Tutorial请教一个数据库设计的问题!

请教一个数据库设计的问题!

我假设一个应用。 比如说论坛
我们发一个帖子  我们建一张  帖子表     topic
然后  支持让游客们回复 准备一张 回复表  reply

我的问题是:
假设我们要知道每一个帖子 的 回复数 我们应该如何去统计比较好呢?
1.在帖子topic表 准备一个字段 回复数(reply_count) 我们直接select这个字段 得出回复数
2.用表关联,然后去select count(reply)数 得到回复数

我是这样想的:
方法1:按正常的业务逻辑走是可行的。并且在效率上是占优势的。但是可能会出现数据的不一致性啊。我的意思是数据库不排斥我记录的是10个回复数 但实际上reply回复表是13个记录。
方法2:数据结构感觉比较严谨,但是就牺牲了搜索效率。
不知道有没其他好的做法,或者说这两个方法哪个更可行一些?


回复讨论(解决方案)

在方法1中,对 reply 的 insert 和 delete 操作成功后,都需要对 topic.reply_count 做 update

其实要看你对:“要知道每一个帖子 的 回复数”的使用频率。
1、如果只是在后台一个月统计一次的话,很显然可以用第二种。
2、如果是浏览帖子就需要显示出来的话,那肯定是第一种啦。 

建议具体问题具体分析,reply_count,字段要建立

建议具体问题具体分析,reply_count,字段要建立

对冗余设计 实际使用看情况。

数据库我才开始看,不过这个问题貌似很简单,就是两个表都要更新,做关联。
我在赶集网发了简历,才要2000,居然没人理我,一个电话都没有,是我简历写的不好吗,帮忙看看吧
姓名:襟绾打唠唬
网址:http://bj.ganji.com/jianli/564717047x.htm?_rtm=1

不要为了节约一个字段而失去效率呵呵。
看看DISCUZ 的表的设计。缓存回帖数是必须的。

数据库我才开始看,不过这个问题貌似很简单,就是两个表都要更新,做关联。
我在赶集网发了简历,才要2000,居然没人理我,一个电话都没有,是我简历写的不好吗,帮忙看看吧
姓名:襟绾打唠唬
网址:http://bj.ganji.com/jianli/564717047x.htm?_rtm=1

不要尝试压低自己的薪资去“乞讨”一份工作,这是一种对自己不自信,不负责任的态度。
朋友,我看了你的简历。
没有真实名字,用人单位如何称呼你?
没有直接的联系电话,你可以加在备注中。
没有一个比较正面的自我描述,对方如何大致了解你?
还有,哥,你也27岁了。只有23 24刚从大学毕业的朋友才可能会真正意义上的责怪自己的大学不好。你都出来社会有一段时间了吧?再继续抱怨自己的大学,你的青春年华也就只是用来抱怨了。
你说希望有个人能带,那么为什么别人不选择刚从大学毕业意气风发的应届生,而要选择你呢?你的优势在哪呢?
 希望你好好准备。祝你好运!

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