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post_ajax's Introduction

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刚好要把坑填完了 整理一些同事的问题,以后做解答

Q1. post请求与ajax有什么区别?在springmvc开发上有什么异同?

听到的时候有点蒙蔽,ajax也可以发送post请求,具体的业务在写法上有些不同,在我当时看来,post请求是ajax的子集这类。有疑问后面再修改吧。[17.05.25]

Q2. oracle中in影响性能,建议用or,但是如果需要or 100乃至需要拼接更多or的时候需要如何解决呢?

Q3. 大数据再分页上如何解决?

今天项目遇到一个之前别人写的sql,发现速度巨慢无比。 select * from A a,B b where a.p=b.p and a.r=? and a.s=? group by createDate desc 外面再嵌套一层分页,这个明天需要解决,先丢在这里记录下。

Q3. where in() 这里的东西非常之多的时候,要怎么处理?暂时用left join来。。。

业务场景: 排行榜 取出按条件筛选的条目,与某表相关的条目,重新排名,取出数据。

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