Redis之-字符串类型

1，set key value ex秒数/px 毫秒 nx/xx
127.0.0.1:6379> set name z2 px 1000
OK
127.0.0.1:6379> ttl name
(integer) -2
nx:表示key不存在时执行操做
xx：表示key存在时操做

如：
127.0.0.1:6379> flushdb
OK
127.0.0.1:6379> set jiaxiao dfss
OK
127.0.0.1:6379> set jiaxiao gjjx nx
(nil)
127.0.0.1:6379> get jiaxiao
"dfss"
127.0.0.1:6379> set jiaxiao hdjx xx
OK
127.0.0.1:6379> get jiaxiao
"hdjx"

2，get key
获取键值

3，获取多个key
mget key

4，偏移字符value
127.0.0.1:6379> set suixingpay niubi
OK
127.0.0.1:6379> get suixingpay
"niubi"
127.0.0.1:6379> setrange suixingpay 2 ll
(integer) 5
127.0.0.1:6379> get suixingpay
"nilli"
注意：若是偏移>字符长度，该字符自动补0x00

127.0.0.1:6379> setrange suixingpay 6 c
(integer) 7
127.0.0.1:6379> get suixingpay
"nilli\x00c"

5，附加值
127.0.0.1:6379> append suixingpay @
(integer) 8
127.0.0.1:6379> get suixingpay
"nilli\x00c@"

6，获取字符串中某个值的范围
注意：对于字符串的下标，左数从0开始，右数从-1开始
127.0.0.1:6379> set area beijing
OK
127.0.0.1:6379> getrange area 2 5
"ijin"
127.0.0.1:6379> getrange area 0 -5
"bei"

7，增长或者减小
127.0.0.1:6379> set ages 20
OK
127.0.0.1:6379> get ages
"20"
127.0.0.1:6379> incr age
(integer) 1
127.0.0.1:6379> get ages
"20"
127.0.0.1:6379> incr ages
(integer) 21
127.0.0.1:6379> get ages
"21"
127.0.0.1:6379> decr ages
(integer) 20
127.0.0.1:6379> get ages
"20"