Working with Hashes

1. Setting Hash Fields

Command	Description
`HSET key f v [f v ...]`	Returns count of new fields
`HMSET key f v ...`	DEPRECATED use HSET

Command	Returns
`HGET key field`	Value or `nil`
`HMGET key f1 f2 ...`	Array (preserves order)

Command	Returns
`HEXISTS key field`	`1` or `0`

Command	Description
`HDEL key f [f ...]`	Returns removed field count; deletes hash if empty

Command	Returns
`HLEN key`	Number of fields

Command	Returns
`HSETNX key field value`	`1` set, `0` exists

Command	Description
`HINCRBY key field n`	Integer increment
`HINCRBYFLOAT key field amt`	Float increment

Command	Returns
`HSTRLEN key field`	Byte length, `0` if missing

Command	Options
`HRANDFIELD key [count [WITHVALUES]]`	+count unique, -count with repetition 6.2+

Command	Options
`HSCAN key cursor [MATCH p] [COUNT n] [NOVALUES]`	`NOVALUES` returns only fields 7.4+

Command	Description
`HEXPIRE key seconds [NX\|XX\|GT\|LT] FIELDS n f1 ...`	Per-field TTL 7.4+
`HPEXPIRE key ms ... FIELDS n f1 ...`	Millisecond resolution
`HEXPIREAT` / `HPEXPIREAT`	Absolute timestamps
`HTTL` / `HPTTL`	Get field TTL
`HPERSIST key FIELDS n f1 ...`	Remove field TTL

HSET session:42 token "abc" csrf "xyz"
HEXPIRE session:42 600 FIELDS 1 csrf
HTTL session:42 FIELDS 1 csrf