Linux server development, detailed explanation of redis related commands and their principles

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MySql use B+ Tree organization data structure , and redis use dictionary Way to organize data structures .

command

• lpush liststr Mark Darren King King
• lrange liststr 0 -1 // It means from the first to the last
• set sayid 1000
• incr sayid
• incrby key 100
• decrby key 100
• setnx feng - // No, set successfully
• object encoding Mark
• setbit xxxx 9 1

application

• Record the number of likes of friends , Comments and hits .(hash)
• Record the circle of friends and talk about the list ( Sort ), Easy to display on the list page .(hash)
• Record the title of the article , Abstract , Sitting and cover , For list page display .(hash)
• Record the likes of users in the circle of friends ID list , Comment on ID list , For display and weight removal technology .(zset)
• Caching hot data , Reduce database pressure .(hash)
• If the circle of friends say ID Is an integer ID, have access to redis Let's allocate a circle of friends and talk about ID( Counter ).(string)
• Through set (set) Call and search set operation to record friends .(set)

string

set role:10001 ‘{[name]=“mark”,[age]=‘18’,[sex]=male}’
// Little change
//role:10001:recharge:10001

Distributed lock

• redis The implementation is an unfair lock , Block waiting
• setnx lock 1
• set lock uuid nx ex 30
• del lock

An operation

• setbit sign:10001:202106 1 1
• bitcount sign:10001:202106
• getbit sign:10001:202106 2

list

• LPUSH key value value value
• LPOP key
• LRANGE key start end
• LREM key count value
• BRPOP key timeout // Key features , The empty one is blocked here 0 For permanent blocking
• LTRIM say 0 49 // Get the leftmost 50 individual
• LRANGE say 0 49

hash

• HINCRBY key field increment
• HLEN key

set

• Disordered storage , Intersection and difference need to be sorted
• SADD key value1 value2 value3
• SMENBERS key
• SINSMENBER key value1
• SRANDMEMBER key 2 // Random access 2 individual
• SPOP key 1 // Kick one randomly
• SIDFF key
• SINTER key
• SUNION key

zset

• ZADD rank 100 MARK
• ZINCRBY rank 20 MARK
• ZCARD rank
• ZRANGE rank 80 100 byscore
• ZRANGE rank 80 100 byscore withscore
• ZREVRANGE rank 80 100 byscore withscore
  Typical applications ： Ranking List