今日话题数量如何实现
就是一般论坛的今天发帖数量是怎么实现的 是不是php自动24点的时候清空下数据库里面今天发帖数吗 有大神给段代码吗
回复内容:
就是一般论坛的今天发帖数量是怎么实现的 是不是php自动24点的时候清空下数据库里面今天发帖数吗 有大神给段代码吗
具体要看你需求有多大,比如小论坛帖子数量比较少,直接使用 sql 查询当天的数量
<code>select count(*) from item where created_at >= curdate(); </code>
但是用户多一点,帖子也多了一点,总是实时计算,性能不好,你可以建立一张表,有用户发新帖的时候将数量 +1
<code>create table topics_num (created_date date, num int, primary key (created_date)); -- 查询 select num from topics_num where created_date = curdate(); </code>
但是用户又多了,帖子又多了一点,总是要查询数据库,性能又不好了,而且还有并发问题导致数量不正确,这时候需要更快的计算方式,使用缓存,比如 redis
<code>$t = new DateTime('today'); $key = 'topics_num_' . $t->format('Y-m-d'); // 当有人发新帖时 $redis->incr($key); // 需要获取数量时 $redis->get($key); </code>
可以有多种实现方式。
redis,文本,SQL都OK
写个定时化任务搞之

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