目录
set/
get(
setnx)
mset/mget
incr/decr/incrby/decrby/incrbyfloat
append
strlen
setnx命令格式
SET key value [EX seconds] [PX milliseconds] [NX|XX]
summary: Set the string value of a key
since: 1.0.0
group: string
可以通过EX seconds 设置key有效期，单位是秒。例如： Ex 60 表示设置的key在60s后失效
可以通过PX milliseconds 设置key有效期，单位是毫秒。例如： PX 60000 标识设置key在60s后失效
通过since发现，该命令自从1.0.0 版本就存在了
group标识该命令属于string组
SETNX key value
summary: Set the value of a key, only if the key does not exist
since: 1.0.0
group: string
GET key
summary: Get the value of a key
since: 1.0.0
group: string
对比set和setnx发现，set k v 每次更新都会成功，而setnx k v 只有k不存在时候才能set成功
2、mset/mget命令格式
MSET key value [key value ...]
summary: Set multiple keys to multiple values
since: 1.0.1
group: string
MGET key [key ...]
summary: Get the values of all the given keys
since: 1.0.0
group: string
Mset可以同时为多个k v 赋值，MGET可以对多个K取数值
3、incr/decr/incrby/decrby/incrbyfloat命令格式
3.1、每执行一次key对应的value数值自动加1
INCR key
summary: Increment the integer value of a key by one
since: 1.0.0
group: string
3.2、每执行一次key对应的value数值自动减1
DECR key
summary: Decrement the integer value of a key by one
since: 1.0.0
3.3、每执行一次key对应的value数值自动加increment
INCRBY key increment
summary: Increment the integer value of a key by the given amount
since: 1.0.0
3.4、每执行一次key对应的value数值自动减increment
DECRBY key decrement
summary: Decrement the integer value of a key by the given number
since: 1.0.0
4、append命令格式
4.1、每次执行对key对应的value都会添加
APPEND key value
summary: Append a value to a key
since: 2.0.0
group: string
4.2、计算key对应的value长度
STRLEN key
summary: Get the length of the value stored in a key
since: 2.2.0
group: string
5、strlen命令格式
计算key对应的value长度
STRLEN key
summary: Get the length of the value stored in a key
since: 2.2.0
group: string
