如何从Redis缓存中获得定制的价值？

Question

I am working on Redis with spring boot. And I am new in Redis. I am stuck in a problem where I need customized data from Redis cache.

For example, the key is 1 and the object stored in Redis is

{
    name,
    age,
    DOB,
    ...    
}

and I want to retrieve only 2 two of them from Redis eg name and age But for a given key Redis returns the complete object. But I need only custom fields from that object.

I have no idea how to get over this problem and I cannot do like just to cache only 2 required fields. Caching of the complete object is required for other purposes.

Please help. Thanks in advance.

Answer 1

You can use hmget operation and specify fields what you need. Next example from official documentation :

redis> HSET myhash field1 "Hello"
(integer) 1
redis> HSET myhash field2 "World"
(integer) 1
redis> HMGET myhash field1 field2 nofield
1) "Hello"
2) "World"
3) (nil)

Edited: If you prefer use list it may look like this:

RPUSH mylist "name"
(integer) 1
redis> RPUSH mylist "age"
(integer) 2
redis> RPUSH mylist "DOB"
(integer) 3

Then you can use

LRANGE mylist 0 1
1) "name"
2) "age"

But if you need associate key with value for one object more elegant will be Hashes data structure