Shulou(Shulou.com)05/31 Report--

To lay the foundation of Redis, you need to learn which common commands. In order to solve this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible method.

First, background introduction

Redis is an open source, advanced key-value storage. It is often called the data structure server, because keys can contain strings, hashes, linked lists, collections and ordered collections, and support a variety of different ways of sorting, so commands are rich and easy to be confused.

Second, Redis common commands

1. Tool command

1), redis-server

Tool commands to start the redis service process

# specify configuration file startup service redis-server redis.conf # designated port startup service redis-server-- port 6379

2), redis-cli

Redis client tools

# using socket to connect to redis server redis-cli-s / tmp/redis.sock # connecting to redis server redis-cli without using socket

3), redis-benchmark

Performance testing tools of redis

# Test redis-benchmark with default parameters # Custom parameters Test redis-benchmark-n 1000000-- csv

4), redis-check-dump

Redis check repair local data file tool

# redis-check-dump dump.rdb

5), redis-check-aof

Redis check repair AOF log file tool

# redis-check-aof appendonly.aof

6), redis-sentinel

Redis cluster management tools

2. General command

Auth Redis authentication command, authentication must be performed before other commands are executed (provided that authentication parameters are set in the configuration file)

Ping tests the connection between the client and the server. The return value is PONG, indicating China Unicom.

Config get * get all configuration parameters

Config set config_name config_value sets configuration parameter values

Info returns server information

Exist to see if a key exists in the current library

Ttl gets the valid duration of the key

Expiration time of expire setting key

Persist key_name removes the expiration time of a key

Del deletes a key

Select n switches to n databases. The default database for redis is 0-15, with a total of 16 databases.

Move key_name n moves the keys of the current library to another database

Type key_name returns the data type of the key

Dbsize gets the number of all keys in the current library

Key * get all the current key (when the number of keys is large, hang will die, use with caution)

Flushdb deletes all key in the current library

Flushall deletes all key from all libraries

Save creates a backup of the current library

Bgsave is the same as save, but it is a background backup and does not block the main process.

Eval executes lua script

3. Type-related commands

1), STRING

Set adds a key-value pair. Multiple settings will overwrite the original value.

Get gets the value of the key

Incr/decr self-increasing / self-decreasing (provided the key value is an integer)

Incrby/decrby specifies an increase or decrease in step size (Q if the key value is an integer)

Strlen gets the length of the key

Append appends a value to the specified key and returns the string length

Setnx determines whether the key exists. If it exists, it returns 0. Otherwise, it returns 1, which will not overwrite the original value.

Getrange gets the value of the key according to the specified subscript

Demo:

127.0.0.1 > get number "20" 127.0.0.1 > incr number (integer) 21 127.0.1 > decr number (integer) 20 127.0.1 > incrby number 5 (integer) 25 127.0.1 > append number hello (integer) 7 127.0.1 > strlen number (integer) 7 127.0.1 > setnx number hello (integer) 0 127.0.1 > getrange number 0 5 "25hell"

2), LISTS

Lpush adds one or more values to the front of the list

Rpush adds one or more values to the end of the list

Lrange gets the elements in the list according to the specified subscript

Lpop gets and fetches * elements from the list

Llen gets the list length

Demo:

127.0.0.1 lpush mylists apple orange pear (integer) 3 127.0.0.1 llen mylists (integer) 3 127.0.0.1) lrange mylists 0-11) "pear" 2) "orange" 3) "apple" 127.0.0.1 integer > rpush mylists banana (integer) 4 127.0.1) lrange mylists 0-11) "pear" 2) "orange" 3) "apple" 4) "banana" 127.0.0.1 pear 6379 > lpop mylists "pear" 127.0.0.1 lpop mylists 6379 > lset mylists 0 four OK 127.0.1 lset mylists 0-11) "four" 2) "apple" 3) "banana"

3), SETS

Sadd adds values to the collection

Smembers views the values in the collection

Sismember determines whether an element is an element in a collection

Sunion returns the union of two sets

Sdiff returns the difference between the two sets (using the previous set as a reference)

Sinter returns the intersection of two sets

Scard returns the number of elements in the collection

Srem deletes the specified value from the collection

Demo:

127.0.0.1 sadd myset one two three (integer) 3 127.0.0.1 sadd myset1 two redis mysql (integer) 3 127.0.0.1 sadd myset1 two redis mysql > smembers myset1) "three" 2) "two" 3) "one" 127.0.0.16379 > smembers myset1 1) "two" 2) "mysql" 3) "redis" 127.0.0.1) "three" 2) "one" 127.0.0.1 sinter myset myset1 > sinter myset myset1 1) "two" 127.0.0.1 > sunion myset myset1 1) "two" 2) "three" 3) "mysql" 4) "one" 5) "redis" 127.0.1 > scard myset (integer) 3 127.0.0.1 > sismember myset redis (integer) 0 127.0.0.1: 6379 > srem myset two (integer) 1 127.0.0.1 smembers myset 1) "three" 2) "one"

4), SORTED SETS

Zadd inserts keys into the ordered collection and specifies the order

Zrange takes out the elements in the specified order

Zscore returns the order in the collection

Zcount returns the number of score in the set in a given interval

Zrem deletes the specified element in the collection

Zrank returns the ranking of elements in the name key

Demo:

127.0.0.1 two 3 three (integer) 3 127.0.0.1 three (integer) 3 127.0.1 integer > zadd sset 3 three (integer) 0 127.0.1 one 0-1 withscores 1) "one" 2) "1" 3) "two" 4) "2" 5) "three" 6) "3" 127.0.0.1 > zrank sset one (integer) 0 127.0.0 .1zincrby sset 6379 > zrank sset two (integer) 1 127.0.0.1 > zcard sset (integer) 3 127.0.0.1 > zincrby sset 2 two "4" 127.0.0.1 > zrange sset 0-1 withscores 1) "one" 2) "1" 3) "three" 4) "3" 5) "two" 6) 4 "127.0.1 > zrem sset three (integer) 1 127.0.1 withscores 6379 > one 0-1 withscores 1) "one" 2) "1" 3) "two" 4) "4"

5), HASHES

Hset returns the hash field as the specified value. If key does not exist, create it first.

Hget gets the key value specified in the hash domain

Hmset sets multiple domains in batch at the same time

Hincrby specifies the hash field plus the given value

Hexists specifies whether field exists. If so, it returns 1, otherwise it returns 2.

Hlen returns the quantity in the field in the specified hash table

Demo:

127.0.0.1 hget user name 6379 > hget user name "jack" 127.0.0.1 > hsetnx user name jack (integer) 0 127.0.0.1 > hmset user1 name bob sex man age 11 OK 127.0.0.1 > hmget user1 name sex age 1) "bob" 2) "man" 3) "11" 127.0.0.1 > hexists user1 score (integer) 0 127.0.0.1 integer > hincrby user1 age 5 (integer) 16 127.0.1 integer > hkeys user1 1) "name" 2) "sex" 3) "age" 127.0.0.1 integer > hgetall user1 1) "name" 2) "bob" 3) "age" 4) "16"

4. Other commands

1), transaction

Multi starts a transaction

Exec executes transaction

Discard undo transaction

Watch monitors the database key. If changed, null is returned.

Demo:

127.0.0.1 OK 6379 > watch "csdn" OK 127.0.0.1 Freund 6379 > multi OK 127.0.0.1 OK 6379 > set csdn blob QUEUED 127.0.0.1 OK 6379 > get csdn QUEUED 127.0.1 OK 6379 > exec 1) OK 2) "blob"

2), copy

Info replication gets replication information

Slaveof establishes replication relationship

Sync synchronization

3), subscribe to publish

Subscribe subscribes to one or more channels

Publish sends messages to a channel

On the foundation of Redis need to learn which common command questions to share the answers here, I hope the above content can be of some help to you, if you still have a lot of doubts to solve, you can follow the industry information channel to learn more related knowledge.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.