Five basic types of redis

redis Official website https://redis.io/commands All operation commands can be found

Redis Five basic types

Redis Five data types are supported ：string（ character string ）,hash（ Hash ）,list（ list ）,set（ aggregate ） And zset(sorted set： Ordered set )

1、String

String ( character string )

• string yes redis Most basic types , One individual key Corresponding to one value.
• string Type is binary safe . intend redis Of string Can contain any data . such as jpg Picture or serialized object .
• string The type is Redis Basic data types , One individual redis Middle string value At most 512M

 

 

Specific examples ：
 

127.0.0.1:6379> keys *
(empty list or set)
127.0.0.1:6379> set k1 v1
OK
127.0.0.1:6379> get k1
"v1"
127.0.0.1:6379> set k2 1234567
OK
127.0.0.1:6379> getrange k2 0 -1
"1234567"
127.0.0.1:6379> getrange k2 0 2
"123"
127.0.0.1:6379> setex k3 20 v3
OK
127.0.0.1:6379> ttl k3
(integer) 17
127.0.0.1:6379> ttl k3
(integer) 16
127.0.0.1:6379> get k3
"v3"
127.0.0.1:6379> ttl k3
(integer) 7
127.0.0.1:6379> get k3
(nil)
127.0.0.1:6379> ttl k3
(integer) -2
127.0.0.1:6379> setex k1 20
(error) ERR wrong number of arguments for 'setex' command
127.0.0.1:6379> setnx k4 v4
(integer) 1
127.0.0.1:6379> get k4
"v4"
127.0.0.1:6379> setnx k1 vvvv
(integer) 0
127.0.0.1:6379> get k1
"v1"
127.0.0.1:6379> 
127.0.0.1:6379> setrange k2 2 x
(integer) 7
127.0.0.1:6379> get k2
"12x4567"
127.0.0.1:6379> clear
127.0.0.1:6379> mset k6 v6 k7 v7 k8 v8
OK
127.0.0.1:6379> mget k6 k7 k8
1) "v6"
2) "v7"
3) "v8"
127.0.0.1:6379> msetnx k8 v8 k9 v9
(integer) 0
127.0.0.1:6379> get k9
(nil)
127.0.0.1:6379> msetnx k9 v9 k10 v10
(integer) 1
127.0.0.1:6379> mget k9 k10
1) "v9"
2) "v10"
127.0.0.1:6379> psetex k11 1000 v11
OK
127.0.0.1:6379> get v11
(nil)
127.0.0.1:6379> get k11
(nil)
127.0.0.1:6379> set k12 12
OK
127.0.0.1:6379> incr k12
(integer) 13
127.0.0.1:6379> incr k12
(integer) 14
127.0.0.1:6379> incr k12
(integer) 15
127.0.0.1:6379> incrby k12 5
(integer) 20
127.0.0.1:6379> incrby k12 5
(integer) 25
127.0.0.1:6379> set key 19.2
OK
127.0.0.1:6379> incrbyfloat key 10
"29.2"
127.0.0.1:6379> incrbyfloat key 10
"39.2"
127.0.0.1:6379> decr k12
(integer) 24
127.0.0.1:6379> decr k12
(integer) 23

127.0.0.1:6379> clear
127.0.0.1:6379> decrby k12 2
(integer) 21
127.0.0.1:6379> decrby k12 2
(integer) 19
127.0.0.1:6379> append k2 hhhhh
(integer) 12
127.0.0.1:6379> get k2
"12x4567hhhhh"
127.0.0.1:6379> setrange k2 2 ppppp
(integer) 12
127.0.0.1:6379> get k2
"12ppppphhhhh"
127.0.0.1:6379> 

// to k1 Set expiration time , front setex Set the expiration time when creating 
127.0.0.1:6379> expire k1 20
(integer) 1
127.0.0.1:6379> ttl k1
(integer) 16
127.0.0.1:6379> ttl k1
(integer) 15
127.0.0.1:6379> get k1
"v1"
127.0.0.1:6379> ttl k1
(integer) 1
127.0.0.1:6379> get k1
(nil)
127.0.0.1:6379> 

2、Hash

Hash ( Hash )            

• Redis hash It's a collection of key-value pairs .（ for example ：Student.name = xiaoming ,Student.age = 18 Student.gender = man）
• Redis hash It's a string Type of field and value Mapping table , hash Ideal for storing objects .（ for example ：Student.name = xiaoming ,Student.age = 18 Student.gender = man）
• similar Java Inside Map<String,Object>

127.0.0.1:6379[1]> hset student name xiaoming
(integer) 1
127.0.0.1:6379[1]> hget student name
"xiaoming"
127.0.0.1:6379[1]> hmset student age 18 gender man
OK
127.0.0.1:6379[1]> hget student name
"xiaoming"
127.0.0.1:6379[1]> hget student age
"18"
127.0.0.1:6379[1]> hmget student name age gender
1) "xiaoming"
2) "18"
3) "man"
127.0.0.1:6379[1]> hlen student
(integer) 3
127.0.0.1:6379[1]> hkeys student
1) "name"
2) "age"
3) "gender"
127.0.0.1:6379[1]> hexists student age
(integer) 1
127.0.0.1:6379[1]> hgetall student
1) "name"
2) "xiaoming"
3) "age"
4) "18"
5) "gender"
6) "man"
127.0.0.1:6379[1]> hincrby student age 2
(integer) 20
127.0.0.1:6379[1]> hincrby student age 2
(integer) 22
127.0.0.1:6379[1]> hset student english 98.5
(integer) 1
127.0.0.1:6379[1]> hincrbyfloat student english 1.0
"99.5"
127.0.0.1:6379[1]> hincrbyfloat student english 1.1
"100.6"
127.0.0.1:6379[1]> hsetnx student age 90
(integer) 0
127.0.0.1:6379[1]> hget student age
"22"
127.0.0.1:6379[1]> clear
127.0.0.1:6379[1]> hvals student
1) "xiaoming"
2) "22"
3) "man"
4) "100.6"
127.0.0.1:6379[1]> hdel student age
(integer) 1
127.0.0.1:6379[1]> hget student age
(nil)
127.0.0.1:6379[1]> 

3、List

• Redis List is a simple list of strings , Sort by insertion order . You can add a header to the element guide list ( On the left ) Or tail ( On the right ).
• Its bottom layer is actually a linked list

Serial number	Command and description
1	BLPOP key1 [key2 ] timeout Move out and get the first element of the list , If there are no elements in the list, it will block the list until the wait timeout or pop-up elements are found .
2	BRPOP key1 [key2 ] timeout Move out and get the last element of the list , If there are no elements in the list, it will block the list until the wait timeout or pop-up elements are found .
3	BRPOPLPUSH source destination timeout Pop up a value... From the list , Insert the pop-up element into another list and return it ; If there are no elements in the list, it will block the list until the wait timeout or pop-up elements are found .
4	LINDEX key index Get the elements in the list by index
5	LINSERT key BEFORE|AFTER pivot value Insert an element before or after a list element
6	LLEN key Get list length
7	LPOP key Move out and get the first element of the list
8	LPUSH key value1 [value2] Insert one or more values into the list header
9	LPUSHX key value Insert a value into the existing list header
10	LRANGE key start stop Get the elements in the specified range of the list
11	LREM key count value Remove list elements
12	LSET key index value Set the value of the list element through the index
13	LTRIM key start stop Trim a list (trim), That is to say , Let the list keep only the elements in the specified range , Elements that are not in the specified range will be removed .
14	RPOP key Remove the last element of the list , The return value is the removed element .
15	RPOPLPUSH source destination Remove the last element of the list , And add the element to another list and return
16	RPUSH key value1 [value2] Add one or more values... To the list
17	RPUSHX key value Add value to existing list

127.0.0.1:6379[2]> lpush list01 1 2 3 4 5
(integer) 5
127.0.0.1:6379[2]> LRANGE list01 0 -1
1) "5"
2) "4"
3) "3"
4) "2"
5) "1"
127.0.0.1:6379[2]> rpush list02 1 2 3 4 5
(integer) 5
127.0.0.1:6379[2]> LRANGE list02 0 -1
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379[2]> LPOP list01
"5"
127.0.0.1:6379[2]> LPOP list02
"1"
127.0.0.1:6379[2]> RPOP list01
"1"
127.0.0.1:6379[2]> RPOP list02
"5"
127.0.0.1:6379[2]> LRANGE list01 0 -1
1) "4"
2) "3"
3) "2"
127.0.0.1:6379[2]> LRANGE list02 0 -1
1) "2"
2) "3"
3) "4"
127.0.0.1:6379[2]> LINDEX list01 2
"2"
127.0.0.1:6379[2]> LLEN list01
(integer) 3
127.0.0.1:6379[2]> LPUSH list03 1 1 1 1  1 1 1 
(integer) 7
127.0.0.1:6379[2]> LREM list03 3 1    // Delete three 1
(integer) 3
127.0.0.1:6379[2]> LRANGE list03 0 -1
1) "1"
2) "1"
3) "1"
4) "1"
127.0.0.1:6379[2]> RPUSH list04 0 1 2 3 4 5 6 7 8
(integer) 9
127.0.0.1:6379[2]> LRANGE list04 0 -1
1) "0"
2) "1"
3) "2"
4) "3"
5) "4"
6) "5"
7) "6"
8) "7"
9) "8"
127.0.0.1:6379[2]> LTRIM list04 3 5   // Intercept 3 to 5 The data of 
OK
127.0.0.1:6379[2]> LRANGE list04 0 -1
1) "3"
2) "4"
3) "5"
127.0.0.1:6379[2]>                     
127.0.0.1:6379[2]> LPUSH list05 1 2 3
(integer) 3
127.0.0.1:6379[2]> LRANGE list04 0 -1
1) "3"
2) "4"
3) "5"
127.0.0.1:6379[2]> LRANGE list05 0 -1
1) "3"
2) "2"
3) "1"
127.0.0.1:6379[2]> RPOPLPUSH list04 list05
"5"
127.0.0.1:6379[2]> LRANGE list04 0 -1
1) "3"
2) "4"
127.0.0.1:6379[2]> LRANGE list05 0 -1
1) "5"
2) "3"
3) "2"
4) "1"
127.0.0.1:6379[2]> 

127.0.0.1:6379[2]> LRANGE list04 0 -1
1) "3"
2) "4"
127.0.0.1:6379[2]> lset list04 1 x
OK
127.0.0.1:6379[2]> LRANGE list04 0 -1
1) "3"
2) "x"
127.0.0.1:6379[2]> 
127.0.0.1:6379[2]> LRANGE list05 0 -1
1) "5"
2) "3"
3) "2"
4) "1"
127.0.0.1:6379[2]> LINSERT list05 before 3 java
(integer) 5
127.0.0.1:6379[2]> LINSERT list05 after 3 mysql
(integer) 6
127.0.0.1:6379[2]> LRANGE list05 0 -1
1) "5"
2) "java"
3) "3"
4) "mysql"
5) "2"
6) "1"
127.0.0.1:6379[2]> 

Performance summary :

• It's a list of strings ,left、 right You can insert and add ;
• If the key doesn't exist , Create a new list ;
• If the key already exists , The new content ;
• If all values are removed , The corresponding bond disappears .
• The operation of linked list is very efficient both in head and tail , But if it is to operate on the intermediate elements , The efficiency is very poor .

4、Set

• Redis Of Set yes string Unordered collection of type . It's through HashTable Realized
• Reproduced in :https://www.runoob.com/redis/redis-sets.html
• Collection members are unique , This means that duplicate data cannot appear in the collection . And the above list Very close to , But it needs to be unique
• Redis The middle set is implemented through a hash table , So add the , Delete , The complexity of searching is O(1).
• The maximum number of members in the collection is 232 - 1 (4294967295, Each collection can store 40 More than 100 million members ).

Serial number	Command and description
1	SADD key member1 [member2] Add one or more members to the collection
2	SCARD key Get the number of members of the collection
3	SDIFF key1 [key2] Returns the difference between the first set and the others .
4	SDIFFSTORE destination key1 [key2] Returns the difference set of a given set and stores it in destination in
5	SINTER key1 [key2] Returns the intersection of a given set
6	SINTERSTORE destination key1 [key2] Returns the intersection of a given set and stores it in destination in
7	SISMEMBER key member Judge member Is the element a collection key Members of
8	SMEMBERS key Returns all members of the collection
9	SMOVE source destination member take member Elements from source The assembly moves to destination aggregate
10	SPOP key Remove and return a random element from the collection
11	SRANDMEMBER key [count] Returns one or more random numbers in a set
12	SREM key member1 [member2] Remove one or more members of the collection
13	SUNION key1 [key2] Returns the union of all given sets
14	SUNIONSTORE destination key1 [key2] The union of all given sets is stored in destination Collection
15	SSCAN key cursor [MATCH pattern] [COUNT count] Iterate over the elements in the collection

127.0.0.1:6379[3]> sadd set01 1 1 2 2 3 3
(integer) 3
(0.58s)
127.0.0.1:6379[3]> smembers set01
1) "1"
2) "2"
3) "3"
127.0.0.1:6379[3]> sismember set01 1
(integer) 1
127.0.0.1:6379[3]> sismember set01 x
(integer) 0
127.0.0.1:6379[3]> scard set01
(integer) 3
127.0.0.1:6379[3]> srem set01 1
(integer) 1
127.0.0.1:6379[3]> smembers set01
1) "2"
2) "3"
127.0.0.1:6379[3]> sadd set02 1 2 3 4 5 6 7 8 9
(integer) 9
127.0.0.1:6379[3]> srandmember 3
(nil)
127.0.0.1:6379[3]> srandmember set02 3
1) "6"
2) "3"
3) "2"
127.0.0.1:6379[3]> srandmember set02 3
1) "6"
2) "3"
3) "9"
127.0.0.1:6379[3]> srandmember set02 3
1) "5"
2) "8"
3) "7"
127.0.0.1:6379[3]> spop set02 2
1) "9"
2) "6"
127.0.0.1:6379[3]> smembers set02
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "7"
7) "8"
127.0.0.1:6379[3]> 
127.0.0.1:6379[3]> sadd set03 x y z
(integer) 3
127.0.0.1:6379[3]> sadd set04 1 2 3
(integer) 3
127.0.0.1:6379[3]> smove set03 set02 x
(integer) 1
127.0.0.1:6379[3]> smembers set03
1) "y"
2) "z"
127.0.0.1:6379[3]> smembers set04
1) "1"
2) "2"
3) "3"
127.0.0.1:6379[3]> 
127.0.0.1:6379[3]> sadd set5 1 2 3 4 5
(integer) 5
127.0.0.1:6379[3]> sadd set6 1 2 3 a b
(integer) 5
127.0.0.1:6379[3]> sdiff set5 set6
1) "4"
2) "5"
127.0.0.1:6379[3]> sinter set5 set6
1) "1"
2) "2"
3) "3"
127.0.0.1:6379[3]> sunion set5 set6
1) "a"
2) "1"
3) "b"
4) "3"
5) "5"
6) "4"
7) "2"
127.0.0.1:6379[3]> 

5、zset(sorted set: Ordered set )

 

• Redis zset and set The same is true. string Collection of type elements , And duplicate members are not allowed .
• The difference is that each element is associated with a double Score of type .
• redis It's the scores that sort the members of a collection from small to large .zset Members of are unique , But fractions (score) But it can be repeated .
   

stay set On the basis of , Add one more score Before it's worth it set yes k1 v1 v2 v3 Now? zset yes k1 score1 v1 score2 v2

127.0.0.1:6379[3]> zadd zset01 60 v1 70 v2 80 v3 90 v4 100 v5
(integer) 5
127.0.0.1:6379[3]> zrange zset01 0 -1
1) "v1"
2) "v2"
3) "v3"
4) "v4"
5) "v5"
127.0.0.1:6379[3]> zrange zset01 0 -1 withscores
 1) "v1"
 2) "60"
 3) "v2"
 4) "70"
 5) "v3"
 6) "80"
 7) "v4"
 8) "90"
 9) "v5"
10) "100"
127.0.0.1:6379[3]> zrangebyscore zset01 60 90
1) "v1"
2) "v2"
3) "v3"
4) "v4"
127.0.0.1:6379[3]> zrangebyscore zset01 60 (90
1) "v1"
2) "v2"
3) "v3"
127.0.0.1:6379[3]> zrangebyscore zset01 (60 90
1) "v2"
2) "v3"
3) "v4"
127.0.0.1:6379[3]> zrangebyscore zset01 (60 (90
1) "v2"
2) "v3"
127.0.0.1:6379[3]> zrangebyscore zset01 60 90 limit 2
(error) ERR syntax error
127.0.0.1:6379[3]> zrangebyscore zset01 60 90 limit 2 2
1) "v3"
2) "v4"
127.0.0.1:6379[3]> 
127.0.0.1:6379[3]> zrem zset01 v5
(integer) 1
127.0.0.1:6379[3]> zrange zset01 0 -1
1) "v1"
2) "v2"
3) "v3"
4) "v4"
127.0.0.1:6379[3]> zcard zset01
(integer) 4
127.0.0.1:6379[3]> zcount zset01 60 80
(integer) 3
127.0.0.1:6379[3]> zrank zset01 v4
(integer) 3
127.0.0.1:6379[3]> zscore zset01  v4
"90"
127.0.0.1:6379[3]> zrevrank zset01 v4
(integer) 0
127.0.0.1:6379[3]> zrevrange zset01 0 -1   // with re It means in reverse order 
1) "v4"
2) "v3"
3) "v2"
4) "v1"
127.0.0.1:6379[3]> zrevrangebyscore zset01 90 60
1) "v4"
2) "v3"
3) "v2"
4) "v1"