Why hashes represent objects in Redis

Introduction

Hashes in Redis store multiple related pieces of information together, just like an object holds different properties about one thing.

Storing user profiles with fields like name, age, and email.

Keeping product details such as price, description, and stock count.

Saving settings or preferences for an application user.

Organizing data about a book with title, author, and year published.

Syntax

Redis

HSET key field value [field value ...]
HGET key field
HGETALL key

Use HSET to add or update fields inside a hash.

HGET retrieves the value of a specific field.

HGETALL returns all fields and values in the hash.

Examples

Adds multiple fields to the hash representing a user.

Redis

HSET user:1000 name "Alice" age 30 email "[e-mail]"

Gets the name field from the user hash.

Redis

HGET user:1000 name

Retrieves all fields and values for the user.

Redis

HGETALL user:1000

Sample Program

This stores details about a book as fields in a hash, then fetches all the details.

Redis

HSET book:1 title "Redis Basics" author "Sam" year 2024
HGETALL book:1

Important Notes

Hashes are efficient for storing small objects with multiple fields.

Each hash key is like an object name, and fields are its properties.

Summary

Hashes group related data like an object groups properties.

Use hashes to store and retrieve multiple fields easily.

They help organize data clearly and efficiently in Redis.