Redis 字符串操作

redis 127.0.0.1:6379> set name wwl 设置key对应的值为String类型的value

OK

redis 127.0.0.1:6379> get name

"wwl"

redis 127.0.0.1:6379> get name

"wwl"

redis 127.0.0.1:6379> del name

(integer) 1

redis 127.0.0.1:6379> exists name

(integer) 0

redis 127.0.0.1:6379> set name Pengdi

OK

redis 127.0.0.1:6379> get name

"Pengdi"

redis 127.0.0.1:6379> setnx name Jenny  设置key对应的值为string类型的value。如果key已经存在则返回0,nx是not exist的意思。

(integer) 0

redis 127.0.0.1:6379> get name

"Pengdi"

redis 127.0.0.1:6379> setex color 5 red

OK

redis 127.0.0.1:6379> get color

(nil)

redis 127.0.0.1:6379> setex color 5 red  设置key对应的值为string类型的value,并指定此键值对应的有效期.这里指定有效期为5秒.

OK

redis 127.0.0.1:6379> get color

"red"

redis 127.0.0.1:6379> get color

"red"

redis 127.0.0.1:6379> get color

(nil)

redis 127.0.0.1:6379> set mail [email protected]

OK

redis 127.0.0.1:6379> get mail

"[email protected]"

redis 127.0.0.1:6379> setrange mail 9 gmail.com 设置指定key的value值的子字符串

(integer) 21

redis 127.0.0.1:6379> get mail

"[email protected]"

redis 127.0.0.1:6379> get name

"Pengdi"

redis 127.0.0.1:6379> mset key1 ppd1 key2 ppd2 一次设置多个key的值,成功返回ok表示所有的值都设置了,失败返回0表示没有任何值被设置。

OK

redis 127.0.0.1:6379> get key1

"ppd1"

redis 127.0.0.1:6379> get name

"Pengdi"

redis 127.0.0.1:6379> getset name Wilian 设置key的值,并返回key的旧值。

"Pengdi"

redis 127.0.0.1:6379> get name

"Wilian"

redis 127.0.0.1:6379> get mail

"[email protected]"

redis 127.0.0.1:6379> getrange name 0,9

(error) ERR wrong number of arguments for 'getrange' command

redis 127.0.0.1:6379> getrange name 0 9  获取指定key的value值的子字符串

"Wilian" 

redis 127.0.0.1:6379> getrange mail 0 9

"pengdi11@g"

redis 127.0.0.1:6379> mget key1 key2 一次获取多个key的值,如果对应key不存在则对应返回nil

1) "ppd1"

2) "ppd2"

redis 127.0.0.1:6379> set age 20

OK

redis 127.0.0.1:6379> incr age 对key的值做加加操作,并返回新的值。

(integer) 21

redis 127.0.0.1:6379> get age

"21"

redis 127.0.0.1:6379> incrby age 5 指定加数

(integer) 26

redis 127.0.0.1:6379> get age

"26"

redis 127.0.0.1:6379> get name

"Wilian"

redis 127.0.0.1:6379> append name .peng 给指定key的字符串值追加value,返回新字符串值的长度

(integer) 11

redis 127.0.0.1:6379> get name

"Wilian.peng"

redis 127.0.0.1:6379> strlen name 取指定key的value值的长度

(integer) 11

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