Как использовать отсортированные списки Redis

Сортированный набор связывает ранг с каждым элементом в наборе.

Сортированные наборы работают так же, как и наборы, и используют аналогичные команды, за исключениемSсейчасZ, Например:

• SADD->ZADD
• SPOP->ZPOP

Но они немного другие.

ZADDпринимаетсчет:

ZADD names 1 "Flavio"
ZADD names 2 "Syd"
ZADD names 2 "Roger"
As you can see, values must still be unique, but now they are associated to a score.
The score does not have to be unique.
Items in a set are always sorted by the score.
This is very useful to implement some kind of data storage tool like (usual example) a leaderboard. Or to indicate the time some item was added, with a timestamp.
You can get the score of an item using ZRANK:
ZRANK names "Flavio"
List all items in a sorted set using ZRANGE, which works similarly to LRANGE in lists:
ZRANGE names 0 -1

Add WITHSCORES to also return the scores information:

You can increment the score of an item in the set using ZINCRBY.
See all the sorted sets commands here.
  

  


More redis tutorials:

Introduction to Redis

How to install Redis

First steps with Redis

Redis Lists

Using Redis Sets

How to use Redis Sorted Lists

How to use Redis Hashes

Redis Publish/subscribe