（一）Redis——String

以下是在Ubuntu上安装Redis的步骤：

1. 打开终端并输入以下命令以更新软件包列表：sudo apt update
2. 输入以下命令以安装Redis：sudo apt install redis-server

SET key value

GET key

key & value 区分大小写

127.0.0.1:6379> set name noritake
OK
127.0.0.1:6379> get name
"noritake"
127.0.0.1:6379> set Name Noritake
OK
127.0.0.1:6379> get Name
"Noritake"

value 默认是字符串

127.0.0.1:6379> set age 25
OK
127.0.0.1:6379> get age
"25"

DEL key

127.0.0.1:6379> del name
(integer) 1
127.0.0.1:6379> get name
(nil)

EXISTS key

127.0.0.1:6379> exists name
(integer) 0
127.0.0.1:6379> exists age
(integer) 1

KEYS *

* 是匹配，*me 匹配结尾为 me 的 key

127.0.0.1:6379> keys *
1) "age"
2) "Name"
127.0.0.1:6379> keys *me
1) "Name"
127.0.0.1:6379> flushall
OK
127.0.0.1:6379> keys *
(empty list or set)

支持中文

127.0.0.1:6379> set name 张三
OK
127.0.0.1:6379> get name
"\xe5\xbc\xa0\xe4\xb8\x89"127.0.0.1:6379> quit$ redis-cli --raw127.0.0.1:6379> get name
张三

TTL（Time to live）

127.0.0.1:6379> TTL name
-1

EXPIRE key

127.0.0.1:6379> expire name 10
1
127.0.0.1:6379> TTL name
3
127.0.0.1:6379> TTL name
2
127.0.0.1:6379> TTL name
1
127.0.0.1:6379> TTL name
0
127.0.0.1:6379> TTL name
-2
127.0.0.1:6379> TTL name
-2
127.0.0.1:6379> get name127.0.0.1:6379> keys name

SETEX key time value

127.0.0.1:6379> SETEX name 5 noritake
OK
127.0.0.1:6379> TTL name
-2

SETNX key value

只有当key存在时才有用

127.0.0.1:6379> SETNX name zz
1
127.0.0.1:6379> get name
zz
127.0.0.1:6379> SETNX age
ERR wrong number of arguments for 'setnx' command