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Marcello 2023-10-20 18:22:46 +02:00
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docs/databases/redis.md
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@ -10,14 +10,14 @@ Often Redis it is called a *data structure* server because it has outer key-valu
### Server Startup
```bash
```bash linenums="1"
redis-server # start the server
redis-cli
```
### [Key-Value Pairs](https://redis.io/commands#generic)
```sh
```sh linenums="1"
SET <key> <value> [ EX <seconds> ] # store a key-value pair, TTL optional
GET <key> # read a key content
EXISTS <key> # check if a key exists
@ -40,7 +40,7 @@ PERSIST <key> # make the key permanent
A list is a series of ordered values.
```sh
```sh linenums="1"
RPUSH <key> <value1> <value2> ... # add one or more values to the end of the list
LPUSH <key> <value1> <value2> ... # add one or more values to the start of a list
@ -55,7 +55,7 @@ RPOP # remove and return the last item fro the list
A set is similar to a list, except it does not have a specific order and each element may only appear once.
```sh
```sh linenums="1"
SADD <key> <value1> <value2> ... # add one or more values to the set (return 0 if values are already inside)
SREM <key> <value> # remove the given member from the set, return 1 or 0 to signal if the member was actually there or not.
SPOP <key> <value> # remove and return value from the set
@ -72,7 +72,7 @@ Sets are a very handy data type, but as they are unsorted they don't work well f
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.
```sh
```sh linenums="1"
ZADD <key> <score> <value> # add a value with it's score
ZRANGE <key> <start_index> <end_index> # return a subset of the sortedSet
@ -84,7 +84,7 @@ ZRANGE <key> <start_index> <end_index> # return a subset of the sortedSet
Hashes are maps between string fields and string values, so they are the perfect data type to represent objects.
```sh
```sh linenums="1"
HSET <key> <field> <value> [ <field> <value> ... ] # set the string of a hash field
HSETNX <key> <field> <value> # set the value of a hash field, only if the field does not exist