A simple Redis-like in-memory database that can perform the following operations:
| Command & Usage | Use |
|---|---|
| SET key value | Set the string value of a key to the specified value |
| GET key | Get the value of a specified key |
| DEL key | Delete the specified key |
| COUNT value | Return the number of times a value occurs |
| EXISTS key | Determine if a key exists |
| INCR key [increment] | Increment the integer value of a specified key by 1. Optionally takes in an increment value |
| DECR key [decrement] | Decrement the integer value of a specified key by 1. Optionally takes in a decrement value |
| GETSET key value | Sets the string value of a key and return its old value |
| MSET key value [key value] | Sets multiple keys to multiple values |
>> SET a '1'
OK
>> GET a
'1'
>> SET a foo
OK
>> GET a
foo
>> DEL a
1
>> GET a
NULL
>>SET a foo
OK
>> SET b foo
OK
>> COUNT foo
2
>>
>> EXISTS key
0
>> SET key value
OK
>> EXISTS key
1
>> SET age 27
OK
>> GET age
27
>> INCR age
28
>> GET age
28
>> SET year 2022
OK
>> INCR year 7
2029
>> SET seconds 60
OK
>> GET seconds
60
>> DECR seconds
59
>> DECR seconds 30
29
>> DECR minutes
The provided key does not exist
>> SET month August
OK
>> GET month
August
>> GETSET month November
August
>> GET month
November