redis常见命令-阿里云开发者社区

redis常见命令

2022-12-09 150

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Redis 开源版，标准版 2GB

简介： redis常见命令

1、启动redis服务，redis-server 通过哪个配置文件启动

redis-server kconfig/redis.conf

2、客户端连接

redis-cli -p 6379

3、select

redis默认有16个数据库，相互切换用select，默认为第0个数据库，select 0

select 1

4、keys *，查看redis中的存储的key

127.0.0.1:6379> keys *
1) "myhash"
2) "mylist"
3) "name"
4) "counter:__rand_int__"
5) "key:__rand_int__"
127.0.0.1:6379>

5、flushdb和flushall清空当前表和清空所有

127.0.0.1:6379> keys *
1) "myhash"
2) "mylist"
3) "name"
4) "counter:__rand_int__"
5) "key:__rand_int__"
127.0.0.1:6379> keys *
1) "myhash"
2) "mylist"
3) "name"
4) "counter:__rand_int__"
5) "key:__rand_int__"
127.0.0.1:6379> flushdb
OK
127.0.0.1:6379> keys *
(empty array)
127.0.0.1:6379> <br><br>127.0.0.1:6379> flushall
OK<br>清空所有表

6、dbsize查看db大小

127.0.0.1:6379> dbsize
(integer) 0
127.0.0.1:6379> set name zhangsan
OK
127.0.0.1:6379> dbsize
(integer) 1
127.0.0.1:6379>

7、exists key判断该key是否存在

127.0.0.1:6379> exists name
(integer) 1
127.0.0.1:6379> get name
"zhangsan"

8、move key db 删除该db的key对应的值，db为1代表当前数据库

127.0.0.1:6379> move name 1
(integer) 1
127.0.0.1:6379> keys *
(empty array)

9、expire name second 在second 秒后key为name的值过期

127.0.0.1:6379> set name wang
OK
127.0.0.1:6379> get name
"wang"
127.0.0.1:6379> expire name 5
(integer) 1
127.0.0.1:6379> get name
(nil)
127.0.0.1:6379>

10、ttl查看当前key的过期时间

127.0.0.1:6379> ttl name
(integer) 6
127.0.0.1:6379> ttl name
(integer) 2
127.0.0.1:6379>

11、type key 查看key的数据类型

127.0.0.1:6379> set name zhangsan
OK
127.0.0.1:6379> type name
string
127.0.0.1:6379>

String类型常用方法

12、append 追加字符串

127.0.0.1:6379> get name
"zhangsan"
127.0.0.1:6379> append name 3333
(integer) 12
127.0.0.1:6379> get name
"zhangsan3333"
127.0.0.1:6379>

13、strlen查看字符串的长度

127.0.0.1:6379> strlen name
(integer) 12
127.0.0.1:6379> get name
"zhangsan3333"
127.0.0.1:6379>

14、incr自增1

127.0.0.1:6379> set views 0
OK
127.0.0.1:6379> incr views
(integer) 1
127.0.0.1:6379> get views
"1"
127.0.0.1:6379> incr views
(integer) 2
127.0.0.1:6379> get views
"2"

15、decr自减1

127.0.0.1:6379> get views
"3"
127.0.0.1:6379> decr views
(integer) 2
127.0.0.1:6379> get views
"2"

16、decrby key step与incrby key step 减少增加，可设置步长，指定增量

127.0.0.1:6379> get views
"2"
127.0.0.1:6379> incrby views 2
(integer) 4
127.0.0.1:6379> get views
"4"
127.0.0.1:6379> decrby views 3
(integer) 1
127.0.0.1:6379> get views
"1"

17、getrange key start end 截取字符串（end为-1，代表结尾）

127.0.0.1:6379> get name
"zhangsan3333"
127.0.0.1:6379> getrange name 3 5
"ngs"
127.0.0.1:6379> getrange name 3 8
"ngsan3"

18、setrange key start value 指定位置替换指定的值

127.0.0.1:6379> get name
"zhangsan3333"
127.0.0.1:6379> setrange name 2 KKKK
(integer) 12
127.0.0.1:6379> get name
"zhKKKKan3333"

19、setex(set with expire)　　#设置过期时间 setnx(set if not exist)　#不存在设置 (在分布式锁中常用)

127.0.0.1:6379> setex key1 50 ceshi
OK
127.0.0.1:6379> get key1
"ceshi"
127.0.0.1:6379> ttl key1
(integer) 39
127.0.0.1:6379> keys *
1) "views"
2) "key1"
3) "name"
127.0.0.1:6379> setnx key2 ceshi
(integer) 1
127.0.0.1:6379> setnx key2 ceshis
(integer) 0
127.0.0.1:6379> get key2
"ceshi"
127.0.0.1:6379>

20、mset,mget批量设置和获取值

127.0.0.1:6379> mset k1 v1 k2 v2 k3 v3
OK
127.0.0.1:6379> mget k1 k2 k3
1) "v1"
2) "v2"
3) "v3"

21、msetnx 为原子性操作，失败的话全部失败。

127.0.0.1:6379> msetnx k1 v1 k6 v6 k8 v8
(integer) 0

22、getset 先get后set 　　#如果不存在，返回nil，如果存在，返回之前的值，并设置新的值

127.0.0.1:6379> get k1
"v1"
127.0.0.1:6379> get m2
(nil)
127.0.0.1:6379> getset m2 hello
(nil)
127.0.0.1:6379> getset k1 java
"v1"
127.0.0.1:6379> get k1
"java"
127.0.0.1:6379>

list型常用方法

23、lpush 将一个值或者多个值插入到列表头部

127.0.0.1:6379> lpush lists test
(integer) 4
127.0.0.1:6379> lrange lists 0 -1
1) "test"
2) "three"
3) "two"
4) "one"
127.0.0.1:6379>

24、lrange遍历list数组

127.0.0.1:6379> lrange lists 0 -1 　　　　#获取list中的所有值
1) "test"
2) "three"
3) "two"
4) "one"
127.0.0.1:6379> lrange lists 2 5　　　　　　#通过区间获取具体的值
1) "two"
2) "one"

25、rpush在列表的尾部插入值

127.0.0.1:6379> lrange lists 0 -1
1) "test"
2) "three"
3) "two"
4) "one"
127.0.0.1:6379> rpush lists end
(integer) 5
127.0.0.1:6379> lrange lists 0 -1
1) "test"
2) "three"
3) "two"
4) "one"
5) "end"

26、lpop rpop 移除列表的值

127.0.0.1:6379> lrange lists 0 -1
1) "test"
2) "three"
3) "two"
4) "one"
5) "end"
127.0.0.1:6379> lpop lists
"test"
127.0.0.1:6379> lrange lists 0 -1
1) "three"
2) "two"
3) "one"
4) "end"

27、lindex 获取下标值

127.0.0.1:6379> lrange lists 0 -1
1) "three"
2) "two"
3) "one"
4) "end"
127.0.0.1:6379> lindex lists 2
"one"

28、llen获取数组的长度

127.0.0.1:6379> llen lists
(integer) 4

29、lrem 移除指定的值，移除list集合中指定个数的value，精确匹配

127.0.0.1:6379> lrange lists 0 -1
1) "three"
2) "two"
3) "one"
4) "end"
127.0.0.1:6379> lpush lists one
(integer) 5
127.0.0.1:6379> lrange lists 0 -1
1) "one"
2) "three"
3) "two"
4) "one"
5) "end"
127.0.0.1:6379> lrem lists 2 one
(integer) 2
127.0.0.1:6379> lrange lists 0 -1
1) "three"
2) "two"
3) "end"
127.0.0.1:6379> lrem lists 2 two
(integer) 1
127.0.0.1:6379> lrange lists 0 -1
1) "three"
2) "end"

30、ltrim通过下标截取指定的长度

127.0.0.1:6379> lrange lists 0 -1
1) "two"
2) "one"
3) "three"
4) "end"
127.0.0.1:6379> ltrim lists 0 2
OK
127.0.0.1:6379> lrange lists 0 -1
1) "two"
2) "one"
3) "three"

31、rpoplpush移除列表的最后一个元素，将他移动到新的列表中

127.0.0.1:6379> lrange lists 0 -1
1) "two"
2) "one"
3) "three"
127.0.0.1:6379> rpoplpush lists otherlists
"three"
127.0.0.1:6379> lrange lists 0 -1
1) "two"
2) "one"
127.0.0.1:6379> lrange otherlists 0 -1
1) "three"

32、lset将列表中指定下标替换为指定的值（更新）不存在下标报错，存在更新

127.0.0.1:6379> lrange lists 0 -1
1) "two"
2) "one"
127.0.0.1:6379> lset lists 0 test
OK
127.0.0.1:6379> lrange lists 0 -1
1) "test"
2) "one"
127.0.0.1:6379> lset lists 3 hello
(error) ERR index out of range

33、linsert 将某个具体的value插入到列表某个元素之前或之后

127.0.0.1:6379> lrange lists 0 -1
1) "test"
2) "one"
127.0.0.1:6379> linsert lists before one  adds
(integer) 3
127.0.0.1:6379> lrange lists 0 -1
1) "test"
2) "adds"
3) "one"
127.0.0.1:6379> linsert lists after one  addss
(integer) 4
127.0.0.1:6379> lrange lists 0 -1
1) "test"
2) "adds"
3) "one"
4) "addss"
127.0.0.1:6379>

set型常用方法

34、sadd 给set中添加元素

127.0.0.1:6379> clear
127.0.0.1:6379> sadd keys one
(integer) 1
127.0.0.1:6379> sadd keys two
(integer) 1
127.0.0.1:6379> sadd keys hello

35、smembers 查看set中的元素

127.0.0.1:6379> smembers keys
1) "one"
2) "hello"
3) "two"
127.0.0.1:6379>

36、sismember 查看set元素中是否存在该元素

127.0.0.1:6379> smembers keys
1) "one"
2) "hello"
3) "two"
127.0.0.1:6379> sismember keys one
(integer) 1
127.0.0.1:6379> sismember keys test
(integer) 0
127.0.0.1:6379>

37、scard 获取set集合中元素的个数

127.0.0.1:6379> scard keys
(integer) 3

38、srem 移除set中的指定元素

127.0.0.1:6379> smembers keys
1) "one"
2) "hello"
3) "two"
127.0.0.1:6379> srem keys one
(integer) 1
127.0.0.1:6379> smembers keys
1) "hello"
2) "two"

39、srandmember 随机获取set中的值

127.0.0.1:6379> srandmember keys
"hello"
127.0.0.1:6379> srandmember keys
"two"
127.0.0.1:6379> srandmember keys
"two"
127.0.0.1:6379> srandmember keys 2
1) "hello"
2) "two"

40、spop 随机删除元素

127.0.0.1:6379> spop keys
"two"
127.0.0.1:6379> spop keys
"hello"
127.0.0.1:6379>

redis常见命令

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