UsmanMERN / REDIS

Learning REDIS TO IMPLEMENT THIS WITH MONGODB

Redis Basic Commands

Strings

Basic Operations

SET key value: Sets the value of a key.
```
SET mykey "Hello"
```
GET key: Gets the value of a key.
```
GET mykey
```
SETNX key value: Sets the value of a key if it does not exist.
```
SETNX mykey "World"
```
MGET key1 key2 ... keyN: Gets the values of multiple keys.
```
MGET key1 key2 key3
```
MSET key1 value1 key2 value2 ... keyN valueN: Sets the values of multiple keys.
```
MSET key1 "value1" key2 "value2" key3 "value3"
```

Number Operations

INCR key: Increments the value of a key by 1.
```
INCR mycounter
```
INCRBY key increment: Increments the value of a key by a specified increment.
```
INCRBY mycounter 5
```

Bitwise Operations

GETBIT key offset: Returns the bit value at the specified offset.
```
GETBIT mykey 7
```
SETBIT key offset value: Sets or clears the bit at the specified offset.
```
SETBIT mykey 7 1
```
BITCOUNT key [start end]: Counts the number of set bits (population counting) in a string.
```
BITCOUNT mykey 0 7
```

Performance

SUBSTR key start end: Returns the substring of the string stored at a key.
```
SUBSTR mykey 0 4
```
GETRANGE key start end: Returns the substring of the string stored at a key (alias of SUBSTR).
```
GETRANGE mykey 0 4
```
SETRANGE key offset value: Overwrites part of the string stored at a key starting at the specified offset.
```
SETRANGE mykey 6 "Redis"
```

Lists

Stack Operations

LPUSH key value1 [value2]: Inserts values at the head of the list.
```
LPUSH mylist "world"
LPUSH mylist "hello"
```
RPUSH key value1 [value2]: Inserts values at the tail of the list.
```
RPUSH mylist "hello"
RPUSH mylist "world"
```

Queue Operations

LPOP key: Removes and returns the first element of the list.
```
LPOP mylist
```
RPOP key: Removes and returns the last element of the list.
```
RPOP mylist
```

Blocking Commands

BLPOP key [key2 ...] timeout: Removes and returns the first element of the list, or blocks until one is available.
```
BLPOP mylist 0
```
BRPOP key [key2 ...] timeout: Removes and returns the last element of the list, or blocks until one is available.
```
BRPOP mylist 0
```
LRANGE key start stop: Returns a range of elements from the list.
```
LRANGE mylist 0 -1
```

Miscellaneous

DEL key: Deletes a key.
```
DEL mykey
```

KEYS user:*

```sh KEYS user:* ```

Redis Sets

SADD key member1 [member2]: Adds members to a set.
```
SADD myset "Hello"
```
SREM key member1 [member2]: Removes members from a set.
```
SREM myset "Hello"
```
SISMEMBER key member: Checks if a member exists in a set.
```
SISMEMBER myset "Hello"
```
SMEMBERS key: Returns all members of a set.
```
SMEMBERS myset
```
SCARD key: Gets the number of members in a set.
```
SCARD myset
```

Redis Hashes

HSET key field value: Sets the value of a field in a hash.
```
HSET myhash field1 "Hello"
```
HGET key field: Gets the value of a field in a hash.
```
HGET myhash field1
```
HMGET key field1 [field2]: Gets the values of multiple fields in a hash.
```
HMGET myhash field1 field2
```
HINCRBY key field increment: Increments the value of a field in a hash by a specified increment.
```
HINCRBY myhash field1 5
```

Redis Sorted Sets

ZADD key score member [score member ...]: Adds members to a sorted set, or updates the score if it already exists.
```
ZADD myzset 1 "one"
```
ZRANGE key start stop [WITHSCORES]: Returns a range of members in a sorted set, by index.
```
ZRANGE myzset 0 -1
```
ZREVRANGE key start stop [WITHSCORES]: Returns a range of members in a sorted set, by index, with scores ordered from high to low.
```
ZREVRANGE myzset 0 -1
```

Redis Streams

XADD key * field value [field value ...]: Appends a new entry to a stream.
```
XADD mystream * field1 "value1"
```
XREAD COUNT count STREAMS key [key ...] ID [ID ...]: Reads data from one or multiple streams.
```
XREAD COUNT 2 STREAMS mystream 0
```
XRANGE key start end [COUNT count]: Returns a range of entries from a stream.
```
XRANGE mystream - +
```
XLEN key: Gets the length of a stream.
```
XLEN mystream
```

Redis Geospatial

GEOADD key longitude latitude member [longitude latitude member ...]: Adds geospatial items (latitude, longitude, name) to a key.
```
GEOADD mygeoset 13.361389 38.115556 "Palermo"
```
GEORADIUS key longitude latitude radius unit: Queries a sorted set representing a geospatial index to fetch members matching a given maximum distance from a point.
```
GEORADIUS mygeoset 15 37 200 km
```

Additional Commonly Used Commands

Keys

EXISTS key: Checks if a key exists.
```
EXISTS mykey
```
EXPIRE key seconds: Sets a timeout on a key.
```
EXPIRE mykey 10
```
TTL key: Gets the time to live for a key.
```
TTL mykey
```

Transactions

MULTI: Marks the start of a transaction block.
```
MULTI
```
EXEC: Executes all commands issued after MULTI.
```
EXEC
```
DISCARD: Discards all commands issued after MULTI.
```
DISCARD
```

Pub/Sub

PUBLISH channel message: Posts a message to a channel.
```
PUBLISH mychannel "Hello, Redis!"
```
SUBSCRIBE channel [channel ...]: Subscribes to a channel.
```
SUBSCRIBE mychannel
```
UNSUBSCRIBE [channel ...]: Unsubscribes from a channel.
```
UNSUBSCRIBE mychannel
```

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Learning REDIS TO IMPLEMENT THIS WITH MONGODB

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