将一个表a的字段aField更新到另一个表b的字段bField上，
两个表通过 a.b_id = b.id 关联

mac技巧之截屏 修改报文文件格式

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有一个组织表 org， 子组织的 parent_id = 父组织的 id
想实现递归查找某个组织下的所有自组织

Philosophy

Markdown is intended to be as easy-to-read and easy-to-write as is feasible.
Readability, however, is emphasized above all else. A Markdown-formatted document should be publishable as-is, as plain text, without looking like it's been marked up with tags or formatting instructions.
Markdown's syntax is intended for one purpose: to be used as a format for writing for the web.