- What Redis is
- Why Redis is so popular
- How to use Redis
- How to use Redis to solve some common problems in Node.js
What you will need
- Node.js
- Upstash Redis account (free) https://upstash.com/
What is Redis?
- Key value store
- Can handle lots of different data structures: https://redis.io/docs/data-types/
- Has lots of features that you’d expect from a database:
- Pub/Sub https://redis.io/docs/interact/pubsub/
- Transactions https://redis.io/docs/interact/transactions/
- Persistence https://redis.io/docs/management/persistence/
- Programmability with Lua https://redis.io/docs/interact/programmability/
- Getting started with Upstash Redis
- Basic commands & data structures
- Problems Redis can solve
- Caching
- Rate limiting
- Pub/Sub
- Indexes
- Transactions
- Set
set mykey tom - Get
get mykey - Del
DEL mykey - Set with TTL
SETEX key seconds value - Check if key exists
EXISTS mykey - List keys
KEYS *
JSON
SET user:100 '{"name": "John", "age": 30, "email": "[email protected]"}'
GET user:100
Hash Hashes are used to store objects, represented by fields and values.
HSET user:101 name "Alice"
HSET user:101 age 24
HSET user:101 email "[email protected]"
HGET user:101 name
Sets Sets are collections of unique elements
SADD myset 1 2 3
SMEMBERS myset
SADD users tom
SADD users alice
SADD users tom
SMEMBERS users
Sorted Sets Sorted sets are similar to sets, but every member of a sorted set is associated with a score, that is used in order to take the sorted set ordered, from the smallest to the greatest score.
ZADD myzset 1 "one"
ZADD myzset 2 "two"
ZADD myzset 3 "three"
ZRANGE myzset 0 -1
Counters
INCR counter
INCRBY counter 10
DECR counter
DECRBY counter 5
GET counter