引言
Redis中每个键值对都是由对象组成:
- 键总是一个字符串对象（string）
- 值可以是字符串对象（string）、列表对象（list）、哈希对象（hash）、集合对象（set）、有序集合对象（zset）。
介绍
redis官方网站中对其数据类型的简单介绍:
An introduction to Redis data types and abstractions
摘抄一段关于redis key的介绍：
Redis keys
Redis keys are binary safe, this means that you can use any binary sequence as a key, from a string like "foo" to the content of a JPEG file. The empty string is also a valid key.
A few other rules about keys:
- Very long keys are not a good idea. For instance a key of 1024 bytes is a bad idea not only memory-wise, but also because the lookup of the key in the dataset may require several costly key-comparisons. Even when the task at hand is to match the existence of a large value, hashing it (for example with SHA1) is a better idea, especially from the perspective of memory and bandwidth.
- 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
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