Redis data Type (string)

String

This is the simplest type of redis. If you only use this type, Redis is like a memcached server that can be persisted

127.0.0.1:6379> Set MyKey Somevalueok

127.0.0.1:6379> get MyKey "somevalue"

SET Command

Set key value [ex seconds] [px milliseconds] [nx|xx]

Ex: set key expiration time, unit seconds

PX: Set the expiration time of the key, in milliseconds

NX: The key cannot be set until it exists

XX: The value of key is set only when keys exist

127.0.0.1:6379> set MyKey newval NX (nil)

127.0.0.1:6379> Set MyKey newval Xxok

127.0.0.1:6379> set MyKey 30seconds ex 30ok127.0.0.1:6379> ttl MyKey (integer) 27

The TTL command is used to view the expiry time of key keys

Using set to implement lock mechanism

Set Resource-name anystring NX ex Max-lock-time

127.0.0.1:6379> set Stock-NX ex 3000OK

Atomic Increment

127.0.0.1:6379> Set Counter 100
Ok

(integer) 101
127.0.0.1:6379> Incrby Counter 50
(integer) 151
127.0.0.1:6379> DECR counter
(integer) 150

Set or store multiple values at once

127.0.0.1:6379> Mset a ten b c 30ok127.0.0.1:6379> mget a B C1) "10" 2) "20" 3 "30"

Mget returns an array of strings

Redis data Type (string)