Redis字符串数据类型的实践

01：设置单个key-value对和查看单个key-value对

172.16.1.31:6379> set key1 "lili"
OK
172.16.1.31:6379> get key1
"lili"

## PS：当添加key1时,若key1存在,则会修改key1之前对应的值

172.16.1.31:6379> set key1 "binbin"
OK
172.16.1.31:6379> get key1
"binbin"

02：设置多个key-value对和查看多个key-value对

172.16.1.31:6379> mset key01 "chenliang" key02 "lanlan"
OK
172.16.1.31:6379> mget key01 key02
1) "chenliang"
2) "lanlan"

## PS：若key01和key01存在,则会修改key01和key02之前对应的值

172.16.1.31:6379> mset key01 "chenliang666" key02 "lanlan666"
OK
172.16.1.31:6379> mget key01 key02
1) "chenliang666"
2) "lanlan666"

03：向某个key中追加内容（不能同时对多个key追加内容）

172.16.1.31:6379> get key01
"chenliang666"
172.16.1.31:6379> append key01 "111111"
(integer) 18
172.16.1.31:6379> get key01
"chenliang666111111"

04：判断某个key对应值的长度

172.16.1.31:6379> get key01
"chenliang666111111"
172.16.1.31:6379> strlen key01
(integer) 18