Redis
# pull the image from docker hub
$ docker run --name redis-learn -p 6370:6370 -d redis
# connect to container and redis shell
$ docker exec -it redis-learn redis-cli
docker exec -it redis-learn redis-benchmark -n 1000 -d 10000
# -d for bytes of data
redis-benchmark -n 1000 -d 10000
> config set maxmemory 128M
- set key value
- get key value
- check whether key exists, returns integer
- 0 - false | 1 - true
> set name "uday"
OK
> get name
"uday"
> exists name
(integer) 1
- Get all keys
- Delete all keys ( sync | async )
> keys *
1) "name"
> flushall
# options : async|sync
OK
# After 5 seconds, this key will be deleted
> set key "value" EX [expiry time in seconds]
> get key
> exists key
# expire after X seconds
> set key "value"
> get key
> expire key X
# to check time remaining
> ttl key
# Another way, to expire after 10 seconds
> setex key 10 "value"
> del name
(integer) 1
> mset first "uday" last "yadav"
> mget first last
1) "uday"
2) "yadav"
> set name "uday yadav"
# Specifies the range : from 0th char to 3rd char
> getrange name 0 3
"uda"
> strlen name
10
# Append to key
> set name "uday"
> append name " yadav"
> get name
"uday yadav"
> set count 1
> incr count
(integer) 2
> incrby count 10
(integer) 12
> decr count
(integer) 11
> decrby count 2
(integer) 9
> set pi 3.14
> incrbyfloat pi 0.1
"3.24"
# lpush adds value infront
> lpush country india
> lpush country USA
> lpush country UK
# get the element at index, start from 0
> lindex country 2
# to add values to the bottom
> rpush country Australia
# to get all values in list
> lrange country 0 -1
1) "UK"
2) "USA"
3) "india"
4) "Australia"
# to get first 2 values
> lrange country 0 1
# get list length
> llen country
# use lpop and rpop to remove the data from top and bottom
# and it returns the element
> lpop country
> rpop country
# to change a key's value
> lset country 0 germany
# to insert values before and after
> linsert country before "germany" "new zealand"
> linsert country after "germany" "UAE"
# use lpushx and rpushx to add key to list only if it exists
# else returns 0
# Alpha is needed only for strings, nothing for integers
> sort country ALPHA
> sort country desc ALPHA
> sadd tech golang
(integer) 1
# when you do it again
> sadd tech golang
(integer) 0
> sadd tech postgis python aws
> sadd tech1 aws python mysql nodejs
# to see all members
> smembers tech
# to get the length of set
> scard tech
# to search the set
> sismember tech aws
1
# to get the diff between to sets
> sdiff tech tech1
# to store the difference btw 2 sets to a new set
> sdiffstore tech tech1 [more set]
# to check intersection
> sinter tech tech1
# add key values
> zadd users 10 uday
> zadd users 5 uday1 8 uday2
# to get all users
> zrange users 0 -1
> zrange users 0 -1 withscores
# in reverse order
> zrevrange users 0 -1
# to get the length of the string
> zcard users
3
# to get key's value over a range
> zcount users 0 2
# to remove member
> zrem users uday
# add keys to a set
> hset myhash name uday
> hset myhash email [email protected]
# get all keys from hashset
> hkeys myhash
# to get all values
> hvals myhash
# get value
> hget myhash name
# to check for keys
> hexists myhash name
# check the length
> hlen myhash
# to set multiple values at once
> hmset myhash country india phone_no 9810039759 age 24
# to get multiple values
> hmget myhash country name email
# increment some value
> hincrby myhash age 2
# to delete key from set
> hdel myhash age
# to avoid over writting the values
> hsetnx myhash name Uday
# to go in transaction mode
> multi
(TX)> set key1 uday
(TX)> set key2 yadav
(TX)> set key3 dev117uday
(TX)> exec
1) OK
2) OK
3) OK
# to discard transaction
discard
Pub/Sub
# To listen to a channel
> subscribe my-chat
# To publish to a channel
> publish my-chat "hello world"
# to subscribe to channel with patterns in name
> psubscribe chats*
> psubscribe h?llo
- If no one is sub to the channel you specify in publish, it returns 0
# add geo spatial data in long : lat
> GEOADD maps 77.216721 28.644800 delhi
> GEOADD maps 72.877426 19.076090 mumbai
# data is tored in sorted set data structure
> zrange maps 0 -1
1) "mumbai"
2) "delhi"
# to get the geohash of city
> GEOHASH maps delhi
1) "ttnfvnes010"
# to get long:lat
> GEOPOS maps delhi
1) 1) "77.21672326326370239"
2) "28.64479890853065314"
# to get distance, in meter (default)
> GEODIST maps delhi mumbai
"1151873.1929"
> GEODIST maps delhi mumbai km
"1151.8732"
# within distance
> GEORADIUS maps 77.216721 28.644800 2000 km
1) "delhi"
2) "mumbai
> GEORADIUS maps 77.216721 28.644800 2000 km withcoord
1) 1) "delhi"
2) 1) "77.21672326326370239"
2) "28.64479890853065314"
2) 1) "mumbai"
2) 1) "72.87742406129837036"
2) "19.07608965708350723"
> GEORADIUS maps 77.216721 28.644800 2000 km withcoord withdist
1) 1) "delhi"
2) "0.0003"
3) 1) "77.21672326326370239"
2) "28.64479890853065314"
2) 1) "mumbai"
2) "1151.8732"
3) 1) "72.87742406129837036"
2) "19.07608965708350723"
> GEORADIUSBYMEMBER maps delhi 1300 km
1) "delhi"
2) "mumbai"
> GEORADIUSBYMEMBER maps delhi 1300 km withcoord withdist desc|asc
1) 1) "mumbai"
2) "1151.8732"
3) 1) "72.87742406129837036"
2) "19.07608965708350723"
2) 1) "delhi"
2) "0.0000"
3) 1) "77.21672326326370239"
2) "28.64479890853065314"
Last modified 7mo ago