关于wordpress的数据库设计解决办法
关于wordpress的数据库设计
在网上看到一篇文章说wordpress数据表采用键值对的形式，这样设计字段少，查询起来更快。数据库查询字段少就快吗，而不是条数少就快？还有它的这种键值对设计，有时一篇文章有4、5个键值对，那这张表很容易条数会非常之多，会不会影响性能。
------解决方案--------------------
php 的关联数组就是键值对的形式，他是哈希表的具体实现
键值对 是 元数据（metadata） 的具体实现
在 noSQL 数据库中得到广泛的应用
而 SQL 数据库是关系型数据库，因此在其中实现元数据的思想是比较困难的
在 SQL 中模拟 noSQL 的行为，由于得不到数据库系统的内部支持，而只能用脚本去实现
显然效率是低下的
就好比一些框架中的 ORM，分明是直接写一条 SQL 指令就可完成的事情
却偏要拆开来通过多个方法传参，然后再组装成 SQL 指令
你能说他会提高效率吗？只不过是看上去像，自欺欺人罢了
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