Redis fundamentals and cheatsheet.
Helloooo !! Everyone !!! . In this tutorial, I have compiled all the necessary commands and cheatsheets required for you to get started with Redis.
So, without any further ado let's get started.
What is Redis?
Redis is often referred to as a data structures server. What this means is that Redis provides access to mutable data structures via a set of commands, which are sent using a server-client model with TCP sockets and a simple protocol. So different processes can query and modify the same data structures in a shared way.
At first, download and install Redis.
For linux and max user visit here => https://redis.io/download
For windows, user visit here => Installing Redis on Windows
If you are still unable to install Redis there are a bunch of videos out there.
For more installation guides => visit here
Start the CLI by
Add a key to database
(it is in key-value pair)
SET name pramit
Get/ read the value in database
Deleting the value in redis
Check the existence of the keys
Display all the inserted keys
Delete everything inside the databases
( by flushing all)
Set an Expiration time to certain keys
EXPIRE name 10
name keys expire in 10 second
Add an expiration time immediately at the time of the creation of the key.
SETEX name 20 pramit
Check time to live for that key.
Redis also supports handling arrays in the form of Lists.
Adding item to start of the Lists.
(left push) => push to the left side of the array
LPUSH car Toyota
To print out the list you need to.
(lrange key startIndex endIndex)
LRANGE car 0 -1
Let's Add another key to the list.
LPUSH car tata
Adding item to the right of the array.
( right push) => push to the right side of the array.
RPUSH car tesla
POP / remove the item from the array(Lists).
LPOP to pop from the left side of array(Lists).
RPOP to pop from the right side of array(Lists).
Sets in Redis are the same as the array but it's every value is unique.
Add an item to sets.
(sadd) => It means sets+add
SADD games "forza horizon"
To list out all the items.
To remove the items from the sets.
(srem) => sets+remove
SREM games "forza horizon"
Redis also have Hashes to store JSON objects.
(NOTE: Hashes does not provide nesting)
Add an item to the hash.
(HSET key field value)
HSET games name forza
Print or get the item from that hash.
HGET games name
TO print/ get everything.
Adding another field for that same key.
HSET games release 2019
Print/get the individual properties.
HGET games name HGET games release
Deleting certain properties.
HDEL games release
checking the existence of a field in hashes.
HEXISTS games name HEXISTS games release