Add Redis cheatsheet

README.md

@@ -9,6 +9,7 @@
 
 - [Languages](#languages)
 - [Frameworks](#frameworks)
+- [Databases](#databases)
 - [Tools](#tools)
 
 
@@ -23,6 +24,11 @@
 - [Node.js](frameworks/node.js)
 
 
+## Databases
+
+- [Redis](databases/redis.sh)
+
+
 ## Tools
 
 - [Docker](tools/docker.sh)

databases/redis.sh

@@ -0,0 +1,153 @@
+##############################################################################
+# BASICS
+##############################################################################
+
+
+redis-server /path/redis.conf  # start redis with the related configuration file
+redis-cli                      # opens a redis prompt
+
+
+##############################################################################
+# STRINGS
+##############################################################################
+
+
+APPEND key value                  # append a value to a key
+BITCOUNT key [start end]          # count set bits in a string
+SET key value                     # set value in key
+SETNX key value                   # set if not exist value in key
+SETRANGE key offset value         # overwrite part of a string at key starting at the specified offset
+STRLEN key                        # get the length of the value stored in a key
+MSET key value [key value ...]    # set multiple keys to multiple values
+MSETNX key value [key value ...]  # set multiple keys to multiple values, only if none of the keys exist
+GET key                           # get value in key
+GETRANGE key value                # get a substring value of a key and return its old value
+MGET key [key ...]                # get the values of all the given keys
+INCR key                          # increment value in key
+INCRBY key increment              # increment the integer value of a key by the given amount
+INCRBYFLOAT key increment         # increment the float value of a key by the given amount
+DECR key                          # decrement the integer value of key by one
+DECRBY key decrement              # decrement the integer value of a key by the given number
+DEL key                           # delete key
+
+EXPIRE key 120                    # key will be deleted in 120 seconds
+TTL key                           # returns the number of seconds until a key is deleted
+
+
+##############################################################################
+# LISTS
+# A list is a series of ordered values
+##############################################################################
+
+
+RPUSH key value [value ...]           # put the new value at the end of the list
+RPUSHX key value                      # append a value to a list, only if the exists
+LPUSH key value [value ...]           # put the new value at the start of the list
+LRANGE key start stop                 # give a subset of the list
+LINDEX key index                      # get an element from a list by its index
+LINSERT key BEFORE|AFTER pivot value  # insert an element before or after another element in a list
+LLEN key                              # return the current length of the list
+LPOP key                              # remove the first element from the list and returns it
+LSET key index value                  # set the value of an element in a list by its index
+LTRIM key start stop                  # trim a list to the specified range
+RPOP key                              # remove the last element from the list and returns it
+RPOPLPUSH source destination          # remove the last element in a list, prepend it to another list and return it
+BLPOP key [key ...] timeout           # remove and get the first element in a list, or block until one is available
+BRPOP key [key ...] timeout           # remove and get the last element in a list, or block until one is available
+
+
+##############################################################################
+# SETS
+# A set is similar to a list, except it does not have a specific order
+# and each element may only appear once. 
+##############################################################################
+
+
+SADD key member [member ...]     # add the given value to the set
+SCARD key                        # get the number of members in a set
+SREM key member [member ...]     # remove the given value from the set
+SISMEMBER myset value            # test if the given value is in the set.
+SMEMBERS myset                   # return a list of all the members of this set
+SUNION key [key ...]             # combine two or more sets and returns the list of all elements
+SINTER key [key ...]             # intersect multiple sets
+SMOVE source destination member  # move a member from one set to another
+SPOP key [count]                 # remove and return one or multiple random members from a set
+
+
+##############################################################################
+# SORTED SETS
+# A sorted set is similar to a regular set, but now each value has an associated score.
+# This score is used to sort the elements in the set.
+##############################################################################
+
+
+ZADD key [NX|XX] [CH] [INCR] score member [score member ...]  # add one or more members to a sorted set, or update its score if it already exists
+
+ZCARD key                           # get the number of members in a sorted set
+ZCOUNT key min max                  # count the members in a sorted set with scores within the given values
+ZINCRBY key increment member        # increment the score of a member in a sorted set
+ZRANGE key start stop [WITHSCORES]  # returns a subset of the sorted set
+ZRANK key member                    # determine the index of a member in a sorted set
+ZREM key member [member ...]        # remove one or more members from a sorted set
+ZREMRANGEBYRANK key start stop      # remove all members in a sorted set within the given indexes
+ZREMRANGEBYSCORE key min max        # remove all members in a sorted set, by index, with scores ordered from high to low
+ZSCORE key member                   # get the score associated with the given mmeber in a sorted set
+
+ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT offset count]  # return a range of members in a sorted set, by score
+
+
+##############################################################################
+# HASHES
+# Hashes are maps between string fields and string values,
+# so they are the perfect data type to represent objects.
+##############################################################################
+
+
+HGET key field          # get the value of a hash field
+HGETALL key             # get all the fields and values in a hash
+HSET key field value    # set the string value of a hash field
+HSETNX key field value  # set the string value of a hash field, only if the field does not exists
+
+HMSET key field value [field value ...]  # set multiple fields at once
+
+HINCRBY key field increment  # increment value in hash by X
+HDEL key field [field ...]   # delete one or more hash fields
+HEXISTS key field            # determine if a hash field exists
+HKEYS key                    # get all the fields in a hash
+HLEN key                     # get all the fields in a hash
+HSTRLEN key field            # get the length of the value of a hash field
+HVALS key                    # get all the values in a hash
+
+
+##############################################################################
+# HYPERLOGLOG
+# HyperLogLog uses randomization in order to provide an approximation of the number
+# of unique elements in a set using just a constant, and small, amount of memory
+##############################################################################
+
+
+PFADD key element [element ...]  # add the specified elements to the specified HyperLogLog
+PFCOUNT key [key ...]            # return the approximated cardinality of the set(s) observed by the HyperLogLog at key's)
+
+PFMERGE destkey sourcekey [sourcekey ...]  # merge N HyperLogLogs into a single one
+
+
+##############################################################################
+# PUBLICATION & SUBSCRIPTION
+##############################################################################
+
+
+PSUBSCRIBE pattern [pattern ...]             # listen for messages published to channels matching the given patterns
+PUBSUB subcommand [argument [argument ...]]  # inspect the state of the Pub/Sub subsystem
+PUBLISH channel message                      # post a message to a channel
+PUNSUBSCRIBE [pattern [pattern ...]]         # stop listening for messages posted to channels matching the given patterns
+SUBSCRIBE channel [channel ...]              # listen for messages published to the given channels
+UNSUBSCRIBE [channel [channel ...]]          # stop listening for messages posted to the given channels
+
+
+##############################################################################
+# OTHER COMMANDS
+##############################################################################
+
+
+KEYS pattern  # find all keys matching the given pattern