Introduction to Redis

EXISTS Command

EXISTS Command

If you simply need to check whether a key exists in Redis without retrieving its value, you can use the EXISTS command.

Example Usage

If you provide a single key, the result will be 1 if the key exists, or 0 if it does not.

In this case, the result will be 1 since the key mykey exists.

When multiple keys are specified, the command will return the number of keys that exist in Redis. If we also have keys key1 and key3 in the database, this query will return 2, since only key1 and key3 exist in the database.

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Introduction to Redis

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1. Redis Fundamentals

This section provides an introduction to Redis, highlighting its core features and common use cases. You’ll learn how to install Redis on different platforms, including Windows and macOS, and get familiar with the basics of connecting to and starting the Redis server.

Installing Redis on Windows

Installing Redis on MacOS

Connecting to and Starting Redis

2. The Essential Redis Commands

Here, we explore the essential Redis commands for managing and manipulating data effectively. You'll learn how to set, retrieve, increment, and delete data using commands like SET, GET, EXISTS, INCR, DECR, and tackle practical tasks to apply these concepts in real-world scenarios.

EXISTS Command

Challenge: Basic Commands

INCR and DECR Commands

Challenge: INCR and DECR

3. Data Types in Redis

Here, you will learn about key Redis data types, including Lists, Sets, Sorted Sets, and Hashes. You will explore their functionality and practical applications through focused exercises designed to reinforce your understanding of each data type.

Challenge: Task Management System

Challenge: Managing User Interests

Challenge: Managing User Profiles

4. Advanced Features and Security

You'll explore advanced features of Redis, including managing key lifecycles, executing transactions, and leveraging the Pub/Sub messaging system. Additionally, you'll learn essential security practices to safeguard your Redis environment against unauthorized access.

Managing Key Expiration

RDB Persistence

AOF Persistence

5. Caching with Redis and Spring Boot

This section introduces the fundamentals of caching and demonstrates how to configure Redis as a cache in a Spring application. It covers key caching annotations and practical examples of caching queries in web applications, concluding with a summary of the main concepts.

Introduction to Caching

Integration with Spring Boot

Annotations for Working with Cache

Practical Use of Hashes