Redis-数据结构(字符串String)

字符串(String)类型：

赋值

127.0.0.1:6379> set name java1234

OK

取值

127.0.0.1:6379> get name

"java1234"

获取并设置值

127.0.0.1:6379> getset name open1111

"java1234"

127.0.0.1:6379> get name

"open1111"

删除

127.0.0.1:6379> del name

(integer) 1

127.0.0.1:6379> get name

(nil)

incr 自增（默认为0）

127.0.0.1:6379> incr n

(integer) 1

127.0.0.1:6379> incr n

(integer) 2

127.0.0.1:6379> get n

"2"

非数字类型会报错

127.0.0.1:6379> set n2 java4321

OK

127.0.0.1:6379> incr n2

(error) ERR value is not an integer or out of range

decr 自减 同上

127.0.0.1:6379> get n

"2"

127.0.0.1:6379> decr n

(integer) 1

127.0.0.1:6379> get n

"1"

incrby 指定增量值

127.0.0.1:6379> get n

"1"

127.0.0.1:6379> incrby n 9

(integer) 10

127.0.0.1:6379> get n

"10"

decrby 指定减量值

127.0.0.1:6379> get n
"10"
127.0.0.1:6379> decrby n 9
(integer) 1
127.0.0.1:6379> get n
"1"

append 追加字符串

127.0.0.1:6379> get name

"java1234"

127.0.0.1:6379> append name 4321

(integer) 12

127.0.0.1:6379> get name

"java12344321"