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Home Backend Development PHP Tutorial mysql比较难的一个字段排序的问题

mysql比较难的一个字段排序的问题

Jun 06, 2016 pm 08:52 PM
mysql php

某个字段的结果是json格式比如

["12312","我是我",0]

我希望按照12312这个值来进行排序,请问能实现么?

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某个字段的结果是json格式比如

["12312","我是我",0]

我希望按照12312这个值来进行排序,请问能实现么?

如果你的应用比较简单,数据量也不大,我的建议是,把需要排序的字段单拎出来,作为一个索引字段。也就是

"12312" | ["12312","我是我",0]
Copy after login

如果你觉得,你的应用场景会越来越复杂,或者需要索引的数据量非常大,那么可以考虑MongoDB,直接把 数据反序列化,以每个字段的方式存进去,也就是

"12312" | "我是我" | 0
Copy after login

使用NoSQL还是要谨慎。。。能用MySQL搞定的,尽量用MySQL

首先MySQL不支持BSON也不支持JSON,即使存储JSON也是序列化之后的。所以排序的话得自己实现。无论是从MySQL端排序还是从脚本端排序,这都不是很好的实现方式,因为需要一个反序列化的操作。
其次你这样的存储方式是类似文档数据库的存储方式(就是NoSQL的一种),而MySQL是关系型数据库,所以临建一张表再将数据移出去是最好的方式。或者改用文档型数据库比如Mongodb。

参考 @gaosboy
如果你的数据量不大,而且只是为了简单的实现这个功能(不考虑效率)
order by cast(mid(fname, 3) as unsigned)

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