redis 的 string 数据类型

1. set，get，mset，mget 赋值取值

set，get 单个赋值和单个取值

127.0.0.1:6379> set liang 123456
OK
127.0.0.1:6379> get liang
"123456"
127.0.0.1:6379>

mset，mget 批量赋值和批量取值

127.0.0.1:6379> mset one 123 two 456
OK
127.0.0.1:6379> mget one two
1) "123"
2) "456"
127.0.0.1:6379>

2. incr，decr，incrby，decrby 用于递减和递减

当存储的字符串为数字时，可使用 incr，decr，incrby，decrby 递增递减

incr，decr 递增递减 1

127.0.0.1:6379> set age 20
OK
127.0.0.1:6379> incr age
(integer) 21
127.0.0.1:6379> get age
"21"
127.0.0.1:6379> decr age
(integer) 20
127.0.0.1:6379> get age
"20"
127.0.0.1:6379>

incrby，decrby 递增递减指定的步长

127.0.0.1:6379> set age 20
OK
127.0.0.1:6379> incrby age 5
(integer) 25
127.0.0.1:6379> get age
"25"
127.0.0.1:6379> decrby age 5
(integer) 20
127.0.0.1:6379> get age
"20"
127.0.0.1:6379>