catalogue . 漏洞描述 . 漏洞触发条件 . 漏洞影响范围 . 漏洞代码分析 . 防御方法 . 攻防思考 1. 漏洞描述 MyBB's unset_globals() function can be bypassed under special conditions and it is possible to allows remote code execution. Relevant Link: https://cxsecurity.com/issue/WLB-2015120164
join on 与 where 条件的执行先后顺序: join on 条件先执行,where条件后执行:join on的条件在连接表时过滤,而where则是在生成中间表后对临时表过滤 left join.right join.full join.inner join区别: left join:以左表为基准,根据on条件过滤连接生成临时表,on后面的过滤条件对左表无效 right join:以右表为基准,根据on条件过滤连接生成临时表,on后面的过滤条件对右表无效 full join:以左表为基准