redis key 键名称中的冒号 : 命名空间层次的表示

刺骨的言语ヽ痛彻心扉 2023-02-11 04:46 18阅读 0赞

## 结论 ##

redis中key的命名，用`:`分隔不同的层次|命名空间，如：`user:id12345:contact`  
如果某个对象有`字段的字段`，用`.`连接。如`user:id12345:contact.mail`。

以及一款redis的可视化操作工具：[Redis Desktop Manager][]。

## Links ##

redis官网文档：[https://redis.io/topics/data-types-intro][https_redis.io_topics_data-types-intro]  
SO社区问答：[https://stackoverflow.com/questions/6965451/redis-key-naming-conventions][https_stackoverflow.com_questions_6965451_redis-key-naming-conventions]  
国内社区问答：[https://answer-id.com/51740587][https_answer-id.com_51740587]

原文：

Very short keys are often not a good idea. There is little point in writing "u1000flw" as a key if you can instead write "user:1000:followers". The latter is more readable and the added space is minor compared to the space used by the key object itself and the value object. While short keys will obviously consume a bit less memory, your job is to find the right balance.
    Try to stick with a schema. For instance "object-type:id" is a good idea, as in "user:1000". Dots or dashes are often used for multi-word fields, as in "comment:qq12345:reply.to" or "comment:qq12345:reply-to".

即下图中的第`2、3`点：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d1eXVqaW4xOTk3_size_22_color_222222_t_70_pic_center]

## 其他分隔符 ##

读过文首三个链接会发现以下格式的ID：  
`user:id12345:contact` 表示`user`表的ID为`id12345`的记录的字段`contact`。(那这个key的值就是对应的字段的值了)  
`user::id12345::contact`或`user:::id12345:::contact`，即多层冒号分隔。  
`user/id12345/contact`  
使用多层冒号分隔、使用`/`分隔，我测试过后，都可以正常获取key的值。但是：  
在`RedisDesktopManager`这款Redis可视化管理工具中，只有使用`单个:分隔`的key名称，层次看起来最舒服【图不贴了，有兴趣自己试试看】。  
另外redis官网也是介绍的`:`，所以**key名称的层次分隔符就推荐单个冒号`:`**

最后一个字段`contact`，如果联系方式包含三种：`tel, mail, qq`，怎么命名？  
官网说可以使用`.`或`-`连接，如：`user:id12345:contact.mail`或`user.id12345.contact-mail`表示*用户表中ID为id12345的记录的contact属性中的mail属性值*。

[Redis Desktop Manager]: https://redisdesktop.com/
[https_redis.io_topics_data-types-intro]: https://redis.io/topics/data-types-intro
[https_stackoverflow.com_questions_6965451_redis-key-naming-conventions]: https://stackoverflow.com/questions/6965451/redis-key-naming-conventions
[https_answer-id.com_51740587]: https://answer-id.com/51740587
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d1eXVqaW4xOTk3_size_22_color_222222_t_70_pic_center]: https://img-blog.csdnimg.cn/20200523114634443.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d1eXVqaW4xOTk3,size_22,color_222222,t_70#pic_center