redis命令(2)--字符串类型

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本文详细介绍了Redis中针对键值的各种操作，包括赋值、取值、数值递增与递减、字符串追加及长度获取等实用命令，并通过具体实例展示了每种命令的使用方法。

1.赋值

set key value

如果key已存在，则value被新值覆盖

localhost:6379> set name yanlei
OK

2.取值

get key value

localhost:6379> get name
"yanlei"

3.递增数值

incr key (key的value必须为数字)

localhost:6379> get name
"yanlei"
localhost:6379> set index 1
OK
localhost:6379> get index
"1"
localhost:6379> incr index
(integer) 2
localhost:6379> incr index
(integer) 3
localhost:6379> get index
"3"
localhost:6379> set name yanlei
OK
localhost:6379> incr name
(error) ERR value is not an integer or out of range//非数字报错

4.增加指定整数

incrby key num

localhost:6379> set index 1
OK
localhost:6379> incrby index 5
(integer) 6

5.递减数值

decr key

localhost:6379> set index 10
OK
localhost:6379> decr index
(integer) 9

6.减少指定整数

decrby key num

localhost:6379> set index 10
OK
localhost:6379> decrby index 6
(integer) 4

7.增加指定的浮点数

incrbyfloat key floatvalue

127.0.0.1:6379> set price 7.7
OK
127.0.0.1:6379> incrbyfloat price 1.1
"8.8"

8.向尾部增加字符串

append key value

localhost:6379> set city shengyang
OK
localhost:6379> append city ' of china'
(integer) 18
localhost:6379> get city
"shengyang of china"

9.获取字符串长度

strlen key

localhost:6379> set money 123456
OK
localhost:6379> strlen money
(integer) 6

10.设置（获取）多个键值

mset key1 value1 key2 value2 ....

mget key1 key2 ...

localhost:6379> mset brand focus color block price 120000
OK
localhost:6379> mget brand color price
1) "focus"
2) "block"
3) "120000"