redis key

1. Set
127.0.0.1:6379> set b 2
OK

2. Get
127.0.0.1:6379> get b
"2"

3. Set multiple, get multiple
127.0.0.1:6379> mset a 1 b 2 c 3
OK
127.0.0.1:6379> mget abc
1) "1"
2) "2"
3) "3"

4. Determine if there is and delete
127.0.0.1:6379> exists b
(integer) 1
127.0.0.1:6379> del b
(integer) 1
127.0.0.1:6379> exists b
(integer) 0
127.0.0.1:6379> get b
(nil)

5. Modify
127.0.0.1:6379> set b 3
OK
127.0.0.1:6379> get b
"3 "

6. Set time to live
127.0.0.1:6379> expire b 3
(integer) 1

7. Get the expiration time
127.0.0.1:6379> ttl b
(integer) 2
127.0.0.1:6379> ttl b
(integer) 1
127.0.0.1:6379> ttl b
(integer) -2
127.0.0.1:6379> get b
(nil)

8. Persistence (ttl -1 indicates that the key does not have a timeout set)
127.0.0.1:6379> set b 3
OK
127.0.0.1:6379> ttl b
(integer) -1
127.0.0.1:6379> expire b 30
(integer) 1
127.0 .0.1:6379> persist b
(integer) 1
127.0.0.1:6379> ttl b
(integer) -1