Redis-数据类型和基础命令

数据类型：
Key：
1、查看所有key

localhost:6379> keys *
1) "k1"

2、设置key，获取key值，删除key

localhost:6379> set k1 v1			#设置单个key
OK	
localhost:6379> mset K1 V1 K2 V2 K3 V3		#设置多个key
OK
localhost:6379> get k1				#获取单个key
"v1"
localhost:6379> mget K1 K2 K3			#获取多个key
1) "V1"
2) "V2"
3) "V3"
localhost:6379> del k1				#删除key
(integer) 1
localhost:6379> get k1
(nil)

3、查看key类型

localhost:6379> keys *
1) "k1"
localhost:6379> type k1
string

4、判断key是否存在

localhost:6379> keys *
1) "k1"
localhost:6379> exists k1
(integer) 1
localhost:6379> exists k2
(integer) 0

5、移除当前key

localhost:6379> move k1 1	       #move key db编号
(integer) 0

6、设置和查看 key 的过期时间，单位是秒（-1 永不过期；-2 没有这个key）

localhost:6379> EXPIRE k2 10	       #设置过期时间
(integer) 1
localhost:6379> ttl k2		       #查看过期时间
(integer) 8
localhost:6379> ttl k2
(integer) 7
localhost:6379> ttl k2
(integer) 4
localhost:6379> ttl k2
(integer) 1
localhost:6379> ttl k2
(integer) -2

7、取消过期时间

localhost:6379> set k2 v2
OK
localhost:6379> expire k2 10	       #设置过期时间
(integer) 1
localhost:6379> ttl k2		       #查看过期时间
(integer) 8
localhost:6379> ttl k2
(integer) 6
localhost:6379> persist k2	       #取消过期时间
(integer) 1
localhost:6379> ttl k2
(integer) -1 #-1 永不过期

8、计算器

localhost:6379> set k3 1
OK
localhost:6379> incr k3		       #每次执行一次就+1
(integer) 2
localhost:6379> incr k3
(integer) 3
localhost:6379> incr k3
(integer) 4
localhost:6379> incrby k3 100	       #设置key加多少
(integer) 104

String：

localhost:6379> set key1 v1
OK
localhost:6379> get key1
"v1"
localhost:6379> append key1 "hello"	#追加字符串
(integer) 7
localhost:6379> get key1
"v1hello"
localhost:6379> strlen key1		#查看key值长度
(integer) 7
localhost:6379> append key1 ",world!"
(integer) 14
localhost:6379> strlen key1
(integer) 14

List：

#LPUSH可向list的左边（头部）添加一个新元素
#RPUSH可向list的右边（头部）添加一个新元素
#LRANGE可从list中取出一定范围的元素
localhost:6379> lpush list1 A
(integer) 1
localhost:6379> lpush list1 B
(integer) 2
localhost:6379> rpush list1 0
(integer) 3
localhost:6379> rpush list1 1
(integer) 4
localhost:6379> llen list1
(integer) 4
localhost:6379> lrange list1 0 -1	#输入不存在的从而到达查看list中全部的值
1) "B"
2) "A"
3) "0"
4) "1"
localhost:6379> lrange list1 1 1	#查看1-1这个范围
1) "A"
localhost:6379> lrange list1 1 3	#查看1-3这个范围
1) "A"
2) "0"
3) "1"
localhost:6379> rpop list1		#从右边开始删除
"1"
localhost:6379> lrange list1 1 3
1) "A"
2) "0"
localhost:6379> lpop list1		#从左边开始删除
"B"
localhost:6379> lrange list1 0 -1
1) "A"
2) "0"

Hash：

localhost:6379> hmset user:1000 name cai age 20 job it
OK
localhost:6379> hmget user:1000 name	#查看这个哈希某个字段
1) "cai"
localhost:6379> hmget user:1000 age
1) "20"
localhost:6379> hmget user:1000 job
1) "it"
localhost:6379> hgetall user:1000	#查看这个哈希全部字段
1) "name"
2) "cai"
3) "age"
4) "20"
5) "job"
6) "it"

Set：

localhost:6379> sadd set1 1 2 3 4 5	#创建集合
(integer) 5
localhost:6379> sadd set2 3 6 2 10
(integer) 4
localhost:6379> SMEMBERS set1		#查看集合
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
localhost:6379> SMEMBERS set2
1) "2"
2) "3"
3) "6"
4) "10"
localhost:6379> sadd set2 3 6 2 10 11 3 5 6	
(integer) 2
localhost:6379> SMEMBERS set2		#不允许出现重复
1) "2"
2) "3"
3) "5"
4) "6"
5) "10"
6) "11"
localhost:6379> sdiff set1 set2		#以第一个为基准，找二个没有的
1) "1"
2) "4"
localhost:6379> SMEMBERS set1
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
localhost:6379> SMEMBERS set2
1) "2"
2) "3"
3) "5"
4) "6"
5) "10"
6) "11"
localhost:6379> sdiff set2 set1		#以第二个为基准，找第一个没有的
1) "6"
2) "10"
3) "11"
localhost:6379> sinter set1 set2	#以第一个为准，求共有的
1) "2"
2) "3"
3) "5"
localhost:6379> sunion set1 set2	#去重后，按顺序排
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "6"
7) "10"
8) "11"