HSET and HGET for fields in Redis

Introduction

HSET and HGET let you store and get small pieces of information inside a bigger group, like putting notes in labeled folders.

You want to save user details like name and age under one user ID.

You need to update or read a specific setting in a configuration without changing others.

You want to keep track of scores for different players in a game.

You want to store product details like price and stock count under one product ID.

Syntax

Redis

HSET key field value
HGET key field

HSET adds or updates a field with a value inside a key that holds many fields.

HGET retrieves the value of a specific field inside the key.

Examples

Stores the name 'Alice' in the 'name' field under the key 'user:1'.

Redis

HSET user:1 name "Alice"

Gets the value stored in the 'name' field under 'user:1', which is 'Alice'.

Redis

HGET user:1 name

Sets the price field to 29.99 for the product with key 'product:100'.

Redis

HSET product:100 price 29.99

Retrieves the price of the product 'product:100'.

Redis

HGET product:100 price

Sample Program

This example stores age and city for user 42, then retrieves both values.

Redis

HSET user:42 age 30
HSET user:42 city "New York"
HGET user:42 age
HGET user:42 city

Important Notes

If the field does not exist, HGET returns nil (no value).

HSET creates the key if it does not exist already.

You can update a field by calling HSET again with the same field name.

Summary

HSET stores or updates a field inside a key.

HGET retrieves the value of a specific field.

They help organize related data under one key like a mini-database.