A NoSQL database, a key-value store, a in memory database, a cache.
All keys must be unique.
//Add, get, delete
SET server:name "fido" //-> key: server:name; value: fido
GET server:name //-> fido
DEL server:name
SETNX server:name "bravo" //-> SET-if-not-exist
//Increment
SET connections 2
INCR connections // -> atomic increment (no collisions)
//Retention policy
SET resource:lock "Redis Demo"
EXPIRE resource:lock 120 //-> delete after 120 sec
TTL resource:lock //-> remaining lifetime: X is a number, -1 never expires, -2 is expires
//List
RPUSH || LPUSH friends "Alice"
RPUSH || LPUSH friends "Bob"
LPOP || RPOP friends
LRANGE 0 1 //-> return a subset: Alice, Bob
LLEN friends //-> length
//Set
SADD superpowers "flight"
SREM superpowers //-> remove a value
SISMEMBER superpowers "reflexes" //-> if in set: 0 no, 1 yes
SMEMBERS superpowers //-> return all members of a set
SUNION superpower birdpower //-> combine sets without duplicates and returns a list
//Ordered sets
// Each entry has a value and a score by with it will sort
//Hashes
HSET user:1000 name "John Smith" //-> map between string field and value
HSET user:1000 email "john.smith@example.com"
HSET user:1000 password "s3cret"
HGETALL user:1000 // -> get from hash
//there are a lot of hash commands