论坛每个版块在数据库中对应一条记录,其中一个字段(posts)用来统计该版块发帖数量,请问这个posts字段该如何维护呢?
1 如果用户发帖/删帖的时候更新该字段,即发帖posts=posts+1,删帖posts=posts-1,并发的时候该如何保证数据的正确呢?
2 如果不用上述的方法,怎样处理更好呢?
回复讨论(解决方案)
一般的论坛有删帖权限的应该是版主和管理员吧。。
对同一个表的同一条记录,任何时刻都只会执行一条指令。
所以并不存在你所谓的并发问题
对同一个表的同一条记录,任何时刻都只会执行一条指令。
所以并不存在你所谓的并发问题
不用做任何安全处理吗?
不存在安全问题,要处理什么?
不存在安全问题,要处理什么?
比如锁定表之类的
另外,如果同时发帖/删帖比较多的话,mysql数据库服务器压力能承受吗?
不要把数据库想的那么弱智
你必须承认:数据库开发者们的能力比你强的多
如果耽心数据库压力太大,那你本就该使用视图,而不是自己维护计数器组
不要把数据库想的那么弱智
你必须承认:数据库开发者们的能力比你强的多
如果耽心数据库压力太大,那你本就该使用视图,而不是自己维护计数器组
如果用视图,需要子查询,然后再多表连接查询,如果数据量积累到很大的话,数据库同样存在较大的压力。
对于这两种方案,不知道哪个好一些。参考了一下discuzX3.1,发现他的表里pre_forum_forum里用计数器(posts)实现的。

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TostartaPHPsession,usesession_start()atthescript'sbeginning.1)Placeitbeforeanyoutputtosetthesessioncookie.2)Usesessionsforuserdatalikeloginstatusorshoppingcarts.3)RegeneratesessionIDstopreventfixationattacks.4)Considerusingadatabaseforsessionstoragei

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PHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.

The security of PHP sessions can be achieved through the following measures: 1. Use session_regenerate_id() to regenerate the session ID when the user logs in or is an important operation. 2. Encrypt the transmission session ID through the HTTPS protocol. 3. Use session_save_path() to specify the secure directory to store session data and set permissions correctly.

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