Redis

Application pour gérer Redis: RedisInsight

Utilisation sans docker

sudo apt install redis
redis-server  # starts redis

Utilisation du CLI:

redis-cli

Commands

Basic values (string): SET, GET
HashMaps: HSET, HGET, HMGET (Get multiple keys)

Keys and Scan

KEYS somekey:*

L'utilisation de KEYS peut ne pas être recommendé.

SCAN 0 COUNT 50 MATCH somekey:*

HashMaps

Example:

> HSET loggedUser:123 name "John Doe" url "https://url" role "Developer"
(integer) 3
> HMGET loggedUser:123 name role
1) "John Doe"
2) "Developer"

Exemple d'un panier:

> HSET cart:123 prod:1:name "Oranges" prod:1:price "2,23" prod:1:amount "1" prod:2:name "Apples" prod:2:price "1,50" prod:2:amount "4"
(integer) 5
> HINCRBY cart:123 prod:1:amount 3
(integer) 4
> HGETALL cart:123
 1) "prod:1:name"
 2) "Oranges"
 3) "prod:1:price"
 4) "1,50"
 5) "prod:1:amount"
 6) "4"
 7) "prod:2:name"
 8) "Apples"
 9) "prod:2:amount"
10) "4"
> HLEN cart:123
(integer) 5

Listes

LPUSH: Left push
RPUSH: Right push

> LPUSH mylist "one" "two" "three" "last element"
> LPOP mylist
"last element"
(integer) 4
> LPOP mylist 3
1) "three"
2) "two"
3) "one"

FIFO Queue: using RPUSH with LPOP
LIFO Queue: using LPUSH with LPOP

> LPUSH mylist "one" "two" "three" "last element"
(integer) 4
> LRANGE mylist 0 1
1) "last element"
2) "three"
> LRANGE mylist 0 -1
1) "last element"
2) "three"
3) "two"
4) "one"

INSERT

> LINSERT mylist AFTER "two" "four"
(integer) 5
> LRANGE mylist 0 -1
1) "last element"
2) "three"
3) "two"
4) "four"
5) "one"

Sets

Set est une liste non ordonnée.

SADD: Add to a set
SPOP: Retrieve random element from set
SREM: Remove element from set
SMEMBERS [queuename]: list elements

SADD thequeue "Element1" "Element2" "Element2"
SMEMBERS thequeue

Utilisation comme Message Broker

SUBSCRIBE <channel name>

Sur un client Consumer:

SUBSCRIBE notifications

Sur un autre client Producer:

PUBLISH notifications "Ici un message important"

Le message apparaîtra sur le client subcriber.

Leaderboard

ZADD leaderboard 200 "Player 2"
ZADD leaderboard 240 "Player 3"
ZADD leaderboard 100 "Player 1"
ZADD leaderboard 180 "Player 5"
ZADD leaderboard 320 "Player 4"
ZRANGE leaderboard 0 5

Par défaut, c'est ordonné dans un sens ascendant. Pour le top score en haut, on peut faire ceci:

ZREVRANGE leaderboard 0 5

Mise à jour des points:

ZINCRBY leaderboard 440 "Player 3"