2024 09 19

2024-09-19¶

Redis Hashes¶

참고: https://redis.io/docs/latest/commands/hmset/ 참고: https://redis.io/docs/latest/commands/hmget/ 참고: https://blog.naver.com/wideeyed/221428664697 참고: https://redis.io/docs/latest/develop/data-types/

레디스의 자료구조 (다양함)
- String: sequence of bytes
- Lists: sorted by insertion order
- Sets: unordered collections of unique strings (Java HashSet)
- Hashes: field-value pairs (Java HashMap)
- Sorted Sets: maintain order of each string
- Stream: append-only log
- Geospatial Index: Location
- Bitmaps: bitwise operations
- 기타...
  - JSON
  - Time series

Hashes

field-value pairs
- Hash Key -> (KEY1)
  - Hash SubKey1 -> (Field1)
  - Hash SubKey2 -> (Field2)

예시

> HSET bike:1 model Deimos brand Ergonom type 'Endure bikes' price 4821
(integer) 4
> HGET bike:1 model
"Deimos"
> HGET bike:1 price
"4821"
> HGETALL bike:1
1) "model"
2) "Deimos"
3) "brand"
4) "Ergonom"
5) "type"
6) "Endure bikes"
7) "price"
8) "4821"
> HMGET bike:1 model price no-no
1) "Deimos"
2) "4821"
3) (nil)

hget
- 입력한 해시 키 밑 지정한 필드값 가져옴. 없으면 nil 반환

hmget

해시에 저장된 특정 키에 따른 필드와 연관된 값들을 반환

해시에 저장된 필드가 아니다 -> nil 반환

redis > HSET myhash field1 "Hello"
(integer) 1
redis > HSET myhash field2 "World"
(integer) 1
redis > HMGET myhash field1 field2 nofield
1) "Hello"
2) "World"
3) (nil)
redis >

hmset
- deprecated -> hset으로 대체 가능! (위의 예시처럼)

2024 09 19

2024-09-19¶

Redis Hashes¶

Redis pub/sub¶