Redis common commands

1. Basic operation of string

#  Writing data 
set  key values
set  name Tom

#  Set multiple keys 
mset x 1 y 2 z 3
mget x y z

#  Do not modify duplicate keys 
setnx name top
 In this way, no one else can modify it 

#  Set the validity period of the key 
setex key time value（ Grammar format ）
ep：setex name 10 wei（ Set up 10s Time validity ）

#  Get the length of the key value string 
strlen name

#  Set new key to get old value 
> GETSET db mongo
> nil        #  No old value returned nil
> get db
> mongo

> GETSET db redis
> mongo      #  Return old value 
> get db
> redis

2. Numeric type operation

set count 90
incr count          ##  Self increasing 1
decr count          ##  Self reduction 1
incrby count 10     ##  Self increasing 10