Course Content

Introduction to Redis

1. Redis Fundamentals

What is Redis?Uses of Redis Installing Redis on Windows Installing Redis on MacOS Connecting to and Starting Redis

2. The Essential Redis Commands

SET Command GET Command EXISTS Command Challenge: Basic Commands INCR and DECR Commands Challenge: INCR and DECR Data Deletion

3. Data Types in Redis

String List Challenge: Task Management System Set Challenge: Managing User Interests Sorted Set Hash Table Challenge: Managing User Profiles

4. Advanced Features and Security

Managing Key Expiration Transactions PubSub Security RDB Persistence AOF Persistence

5. Caching with Redis and Spring Boot

Introduction to Caching Integration with Spring Boot Annotations for Working with Cache Practical Use of Hashes

Challenge: INCR and DECR

You are working with a platform where users can like or dislike various posts. Each post has a unique identifier, such as post:1, post:2, post:3.

The task is to build a system to track reactions on multiple posts by randomly adding likes and dislikes, and then displaying the total count of reactions for each post.

Create 3 posts, each with two counters: one for likes and one for dislikes. For example: post:1:likes, post:1:dislikes, and so on;
Use the INCR or INCRBY command to add likes and dislikes to each post. Add 3 likes and 2 dislikes to post:1, and 5 likes and 1 dislike to post:2;
Use the DECR or DECRBY command to decrease reactions for some posts. Remove 1 like from post:1 and 2 dislikes from post:2;
Use the GET command to retrieve the current number of likes and dislikes for each post.

The expected result should look like this:

Post 1: 2 likes, 2 dislikes
Post 2: 5 likes, 0 dislikes
Post 3: 0 likes, 0 dislikes

Create counters for likes and dislikes for each post:

SET post:1:likes 0
SET post:1:dislikes 0
SET post:2:likes 0
SET post:2:dislikes 0
SET post:3:likes 0
SET post:3:dislikes 0

Add 3 likes and 2 dislikes to post:1:

INCRBY post:1:likes 3
INCRBY post:1:dislikes 2

Add 5 likes and 1 dislike to post:2:

INCRBY post:2:likes 5
INCRBY post:2:dislikes 1

Remove 1 like from post:1 and 2 dislikes from post:2:

DECRBY post:1:likes 1
DECRBY post:2:dislikes 2

Retrieve the current number of likes and dislikes for each post:

GET post:1:likes
GET post:1:dislikes
GET post:2:likes
GET post:2:dislikes
GET post:3:likes
GET post:3:dislikes

Everything was clear?

Thanks for your feedback!

Section 2. Chapter 6

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