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

This article mainly introduces "what are the commands commonly used in Redis". In daily operation, I believe many people have doubts about the commands commonly used in Redis. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "what commands are commonly used in Redis?" Next, please follow the editor to study!

Check to see if redis is started

[redis@cjcos01 src] $ps-ef | grep redisredis 2156 1 0 17:47? 00:00:00. / redis-server 0.0.0.0 ef 6379

Two, start redis

[redis@cjcos01 src] $pwd/usr/local/redis/src [redis@cjcos01 src] $. / redis-server.. / conf/redis.conf

Triple connection redis

[redis@cjcos01 ~] $redis-cli-- help [redis@cjcos01 ~] $redis-cli [redis@cjcos01 ~] $redis-cli-h 192.168.30.100-p 6379 [redis@cjcos01] $redis-cli-h 192.168.30.100-p 6379-- raw

Four choose the database

After installing redis, 16 databases (0-15) are created by default, and database 0 is logged in by default.

192.168.30.100 select 15OK192.168.30.100:6379 6379 > select 0OK192.168.30.100:6379 > select 1OK192.168.30.100:6379 [1] > select 5OK192.168.30.100:6379 [5] > select 15OK192.168.30.100:6379 [15] > select 16ERR DB index is out of range

Five string operation methods

Commands related to the Redis string data type are used to manage redis string values

5.1 New

192.168.30.100Suzhou 6379 > set name cjcOK

5.2 query

192.168.30.100Suzhou 6379 > get namecjc

5.3 Modification

192.168.30.100Suzhou 6379 > set name chenjch

5.4 modify and return old values at the same time

192.168.30.100 6379 > getset name chenjchcjc192.168.30.100:6379 > get namechenjch

5.5 returns the string length

192.168.30.100Suzhou 6379 > strlen name7

Add one to the numeric value stored in key (can be used for like counting, etc.)

192.168.30.100 get age18192.168.30.100:6379 > incr age19192.168.30.100:6379 > incr age20192.168.30.100:6379 > incr age21192.168.30.100:6379 > incr age22192.168.30.100:6379 > incr age23

5.7 add the numeric value stored in key to the specified value

192.168.30.100 incrby age 6379 > 198.30.100

5.8 subtract the numeric value stored in key by one

192.168.30.100 decr age22192.168.30.100:6379 > decr age21192.168.30.100:6379 > decr age20

5.9 subtract the specified value from the numeric value stored in key

192.168.30.100 decrby age 6379 > 198.30.100

5.10 if the key already exists and is a string, the APPEND command appends the specified value to the end of the original value of the key (value).

192.168.30.100 get namechenjch192.168.30.100:6379 > append name cjc10192.168.30.100:6379 > get namechenjchcjc

5.11 Delete

192.168.30.100Suzhou 6379 > del name1

5.12 View all key of the current database (used cautiously in production environment)

192.168.30.100 6379 > keys * nameage

5.13 clear the current database (used with caution in the production environment)

192.168.30.100Suzhou 6379 > flushdbOK

5.14 clear all databases (use with caution in production environment)

192.168.30.100Suzhou 6379 > flushallOK

5.15 set value and worthwhile expiration time

192.168.30.100 setex name 6379 > 10 chenjchOK

5.16 View expiration time (default-1, which means never expire)

192.168.30.100Suzhou 6379 > ttl name3

5.17 modify expiration time

192.168.30.100 expire name 6379 > ttl name96 1001192.168.30.100 purl 6379

5.18 batch add value

192.168.30.100 keys 6379 > mset name cjc age 18 sex maleOK192.168.30.100:6379 > keys * namesexage

5.19 batch query value

192.168.30.100Suzhou 6379 > mget age sex name18malecjc

Six hash (Hash) operation method

Https://www.runoob.com/redis/redis-hashes.html

Redis hash is a mapping table for field and value of type string, and hash is particularly suitable for storing objects.

Each hash in Redis can store 2 ^ 23-1 key-value pairs (more than 4 billion).

Seven Redis list (List)

Https://www.runoob.com/redis/redis-lists.html

The Redis list is a simple list of strings sorted in the order in which they are inserted. You can add an element to the head (left) or tail (right) of the list.

A list can contain up to 2 ^ 32-1 elements (4294967295, each list has more than 4 billion elements).

7.1Creating list data

192.168.30.100 lpush ckey redis1192.168.30.100:6379 > lpush ckey mongodb2192.168.30.100:6379 > lpush ckey mysql3192.168.30.100:6379 > lpush ckey oracle4192.168.30.100:6379 > lpush ckey db25

7.2 query list data

192.168.30.100 lrange ckey 6379 > lrange ckey 0 100db2oraclemysqlmongodbredis192.168.30.100:6379 > lrange ckey 1 2oraclemysql

7.3 get the list length

192.168.30.100Suzhou 6379 > llen ckey5

7.4 insert one or more values into the list header

192.168.30.100 lpush ckey sqlserver6192.168.30.100:6379 > lrange ckey 0 100sqlserverdb2oraclemysqlmongodbredis

7.5 remove the last element of the list and return the removed element

192.168.30.100 rpop ckeyredis192.168.30.100:6379 > lrange ckey 0 100sqlserverdb2oraclemysqlmongodb

Eight Redis sets (Set)

Https://www.runoob.com/redis/redis-sets.html

The Set of Redis is an unordered collection of type String. Collection members are unique, which means that there can be no duplicate data in the collection.

Collections in Redis are implemented through hash tables, so the complexity of adding, deleting and searching is O (1).

Add, automatic weight removal

192.168.30.100 sadd cjckey redis1192.168.30.100:6379 > sadd cjckey mongodb1192.168.30.100:6379 > sadd cjckey mysql1192.168.30.100:6379 > sadd cjckey oracle1192.168.30.100:6379 > sadd cjckey oracle192.168.30.100:6379 > sadd cjckey mysql0

View collection, de-duplicate, out of order

192.168.30.100Suzhou 6379 > smembers cjckeymysqlredismongodboracle

Nine Redis ordered sets (sorted set)

Redis ordered collections, like collections, are collections of elements of type string, and duplicate members are not allowed.

The difference is that each element is associated with a score of type double. Redis sorts the members of the collection from small to large by scores.

The members of an ordered set are unique, but the score can be repeated.

192.168.30.100 zadd chenjchkey 1 redis1192.168.30.100:6379 > zadd chenjchkey 2 mongodb1192.168.30.100:6379 > zadd chenjchkey 3 mysql1192.168.30.100:6379 > zadd chenjchkey 4 db21192.168.30.100:6379 > zadd chenjchkey 5 oracle1192.168.30.100:6379 > zadd chenjchkey 6 redis192.168.30.100:6379 > zadd chenjchkey 6 tidb1192.168.30.100:6379 > zadd chenjchkey 6 gbase1

View

192.168.30.100 zrange chenjchkey 6379 > zrange chenjchkey 0 100mongodbmysqldb2oraclegbaseredistidb192.168.30.100:6379 > zrange chenjchkey 0100 withscoresmongodb2mysql3db24oracle5gbase6redis6tidb6, this is the end of the study on "which commands are commonly used in Redis". I hope I can solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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