HSET & HGET — Field-Level Storage

Redis hashes store field-value pairs under a single key — like a nested dictionary.

Commands

• HSET key field value [field value ...] — set fields, return count of new fields added
• HGET key field — return field value as bulk string, or $-1 if missing

Multi-field HSET

HSET user name Alice age 30 city NYC sets three fields at once, returns :3 (all new).

Updating existing fields: HSET user age 31 returns :0 (no new fields, just updated).

Use Cases

Hashes are perfect for objects:

• User profiles: HSET user:123 name Alice email [email protected]
• Counters per category: HINCRBY stats page_views 1
• Configuration: HSET config max_retries 3 timeout 5000

Implementation

Store hashes as a map of maps: hashes = {key: {field: value, ...}}