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今日发表的文章数

Jun 06, 2016 pm 08:39 PM
mysql php

如何统计今日发表的文章数?

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如何统计今日发表的文章数?

  1. 假设你是在一个数据库保存一个博文表,也不打算新增一个统计表,那么直接写SQL语句统计,
    Select count(*) FROM blog WHERE pub_date='2014-12-26';
    优点:简单,直接
    缺点:每次这样统计,消耗数据资源 -> 数据量大 -> 慢; 分库场景基本不可用

  2. 假设你打算新增统计表,比如叫stat,以日期为主键,还有一个字段叫blog_count,每次新增就加,每次删除就减
    优点:查询速度杠杠的,
    缺点:维护多了一张表,业务逻辑复杂了

  3. 以上是单纯使用数据库的方式,还可以把这类统计数据存Redis,加快存取速度
    优点:性能更好
    缺点:引入新的服务,增加维护成本

如果文章表有时间字段的话可以使用:
SELECT count(*) as today_count FROM 表名 WHERE TO_DAYS(时间字段名) =TO_DAYS(now());

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