Redis

How to install redis

Windows

• You need to install a distros(distribution) for Linux lets take Ubuntu
• First you need wsl (Also disable your antivirus, because sometimes it cries. This is 100% safe)
  • Open cmd or powershell as admin
    • wsl --install
  • List out all distros
    • wsl --list --online
  • Install Ubuntu
    • wsl --install -d Ubuntu
  • Open Ubuntu from search bar
    • For the first time it will ask you to set name and password
    • Then install package universe sudo add-apt-repository universe, this will allow you to install all the open-source package like Redis which do not come under Ubuntu
    • Finally install Redis sudo apt-get intall redis
• Congratulations 🎉 You have installed Redis, now to start Redis Server on you local machine type redis-server in your Ubuntu terminal.
• Now open another Ubuntu terminal and type redis-cli, now you can communicate with your redis server
• Remember not to close your Redis Server

Basic Commands

Note - < abc > needs to be replaced by appropriate data KV - Key-Value

• SET <KEY_NAME> <VALUE>🔸Set a key-value in redis volitile storage
• GET <KEY_NAME>🔸Get the value for given KEY_NAME
• KEYS *🔸 Get all keys
• EXISTS <KEY_NAME>🔸Check if a key exists
• FLUSHALL🔸Removes all saved up key-value pairs
• CLEAR🔸Clear's the console
• EXPIRE <KEY_NAME> <SECONDS>🔸For existing key set expiration time
• SETEX <KEY_NAME> <SECONDS> <VALUE>🔸Set a new key with expiration time

Array

• LPUSH <KEY_NAME> <VALUE>🔸Add's KV at the start
• RPUSH <KEY_NAME> <VALUE>🔸Add's KV at the end
• LPOP <KEY_NAME>🔸Remove's KV from start
• RPOP <KEY_NAME>🔸Remove's KV from end
• LRANGE <KEY_NAME> <START> <END>🔸 Log's all the KV's from range start to end

Set (Does not contain duplicates)

• SADD <KEY_NAME> <VALUE>🔸Add KV in set
• SMEMBERS <KEY_NAME>🔸Log's all the KV pair's in set
• SREM <KEY_NAME> <VALUE>🔸Remove's KV from set

Hashes

Why even need Hash, as Redis is already built upon key-value pairs?

Hash in Redis gives user's a way to store multiple field's and value's for a key. Additionally it allow user to store complex data.

• HSET <KEY> <FIELD> <VALUE>🔸 Add's key-{field, value} in hash
• HGET <KEY> <FIELD>🔸Get the value for a key's field
• HGETALL <KEY>🔸Get all Field and Values for a Key
• HDEL <KEY> <FIELD>🔸Removes Field and Value for a given field
• HEXISTS <KEY> <FIELD>🔸Check if a field exists