Cqrs

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CQRS Explained in 5 MINUTES | What is CQRS?

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06.03.2023

CQRS stands for Command and Query Responsibility Segregation. The term was introduced by Greg Young in 2010 to describe a pattern that advocates for clear code separation between the state mutation and data retrieval. If we imagine a traditional layered architecture, CQRS slices our core application logic vertically, creating two models: one used for reads and the other used for writes. When compared to CRUD, Read operations map to Queries, while Create, Update and Delete operations are replaced by Commands. In its strict definition: a command is not data centric. It is not about creating, updating or deleting a single record on our database. A Command represents the intention to perform a task. It maps more closely to a complex business operation like generating an invoice, booking a hotel room, or provisioning a bare metal server. CQRS can also help satisfy high performance and scalability requirements, especially when combined with a microservices architecture and asynchronous processing. Greg Young himself describes CQRS more as a stepping stone towards event sourcing. It was a way to facilitate the necessary mental model switch that is required when working with an append only event log. If you are interested in the topic, you can watch the original clip 🤍 📝 *Subscribe to my newsletter!* 📝 🤍 🤝 *Do you want to connect with me? / Do you need help?* 🤝 Visit my website: 🤍 Add me on LinkedIn: 🤍 Add me on Twitter: 🤍 🙏 *Do you want to help me?* 🙏 🤍 #systemdesign #softwarearchitecture #softwaredevelopment

Event Sourcing 101: Command Query Responsibility Segregation (CQRS)

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11.01.2022

🤍 | CQRS (Command Query Responsibility Segregation) provides a solution for the delays that can accompany large chronological reductions in event-based systems. It accomplishes this by segregating systems into a write side and read side. Operations, such as reduces, are performed asynchronously on your events when they are written, as opposed to when they are queried for reads. This extensively reduces the latency of your queries. Use the promo code EVENTS101 to get $25 of free Confluent Cloud usage: 🤍 Promo code details: 🤍 LEARN MORE ► Event-Driven Architecture - Common Mistakes and Valuable Lessons ft. Simon Aubury: 🤍 ► "Commander: Better Distributed Applications through CQRS and Event Sourcing" by Bobby Calderwood: 🤍 ► CQRS: 🤍 ABOUT CONFLUENT Confluent is pioneering a fundamentally new category of data infrastructure focused on data in motion. Confluent’s cloud-native offering is the foundational platform for data in motion – designed to be the intelligent connective tissue enabling real-time data, from multiple sources, to constantly stream across the organization. With Confluent, organizations can meet the new business imperative of delivering rich, digital front-end customer experiences and transitioning to sophisticated, real-time, software-driven backend operations. To learn more, please visit 🤍confluent.io. #eventdrivenarchitecture #apachekafka #kafka #confluent

CQRS pitfalls and patterns - Udi Dahan - NDC Oslo 2023

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08.07.2023

As more developers apply Command/Query Responsibility Segregation to their projects, many find that it INCREASES the complexity of their systems rather than decreasing it, often without any performance benefits either. Join Udi for a look at where you should, and more importantly SHOULDN'T be using CQRS in your projects. Check out our new channel: NDC Clips: 🤍ndcclips Check out more of our featured speakers and talks at 🤍 🤍

CQS and CQRS: Command Query Responsibility Segregation

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The CQS and CQRS design principles explained. 00:00 CQS: Command Query Separation 01:29 CQRS: Command Query Responsibility Segregation 2:10 Separating reads and writes 2:37 Scaling independently

CQRS Doesn't Have To Be Complicated | Clean Architecture, .NET 6

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23.09.2022

📌 Accelerate your Clean Architecture skills: 🤍 🚀 Support me on Patreon to access the source code: 🤍 CQRS, which stands for Command Query Responsibility Segregation, is a popular design pattern. In this video, I will show you how to implement CQRS using the MediatR library. We are going to create custom Command and Query abstractions, to make our CQRS implementation more explicit. Join my weekly .NET newsletter: 🤍 Subscribe for more: 🤍 Chapters 0:00 What is CQRS? 3:00 CQRS With MediatR 5:27 Explicit Command Abstraction 9:47 Configuring MediatR 11:20 CQRS Command Side in Action 14:59 Explicit Query Abstraction 21:10 CQRS Query Side in Action 23:27 Awesome Outro

What is Event Sourcing and CQRS? (EDA - part 3)

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29.06.2021

As part of the Event Driven Architecture Series, in this video I explain Event Sourcing and CQRS. What is Event Sourcing? What is CQRS (or Command Query Segregation Pattern)? How do they relate? And what do they have to do with Event Driven Architecture and Microservices? In this video I try to cover all these questions in about 8 minutes using examples. Event Sourcing promotes to store data using Events, via an Event Log. This provides several features, allowing for greater scalability in the services but with some drawbacks like Eventual Consistency. CQRS combines really good with Event Sourcing to also offer more flexibility when scaling distributed services, but might be way more complex than typical/straightforward CRUD operations. #EventSourcing #CQRS #Microservices #EventDriven - 📘 Recommended books (incentivized): - Microservices Patterns: 🤍 - Building Microservices: 🤍 🔖 Relevant resources: - The many meanings of Event Driven Architecture: 🤍 - Event Sourcing: 🤍 - What they don't tell you about Event Sourcing: 🤍 - Pros and Cons: 🤍 - When to use CQRS: 🤍 - 🤓 If you are preparing for a technical interview, don't miss my playlist: 🤍 📚 I have also prepared FREE study guides available here (no subscription needed): 🤍 - Remember you can reach me here: - #️⃣ Twitter: 🤍 -⌨️ Github: 🤍 - In A Dev' Story I explain Software Development related topics from my point of view. I'll be explaining different topics in "Chapters" according to the stage of the story I think they belong. Hope is as entertaining for you as it's fun for me to create these videos Thanks again for watching! Feel free to like, comment, share and subscribe, it means a lot to me and helps the channel grow.

CQRS & Event Sourcing Code Walk-Through

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17.11.2021

Want to see an example of how CQRS & Event Sourcing work together? Here's a code walk-through that illustrates sending commands to your domain that stores Events in an Event Store. The Events are then published to Consumers that updated Projections (read models) that are then consumed by Queries. This is the stereotypical set of patterns used when using CQRS and Event Sourcing together. 🔗 EventStoreDB 🤍 🔔 Subscribe: 🤍 💥 Join this channel to get access to source code & demos! 🤍 🔥 Don't have the JOIN button? Support me on Patreon! 🤍 📝 Blog: 🤍 👋 Twitter: 🤍 ✨ LinkedIn: 🤍 0:00 Intro 3:39 Command & Event Sourcing 7:11 Projection 10:26 Query #softwarearchitecture #eventsourcing #cqrs

Intro to MediatR - Implementing CQRS and Mediator Patterns

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05.04.2021

MediatR is a tool that makes implementing the mediator pattern much easier. It also allows us to conform more easily to the CQRS pattern. Now, if I have already lost you, never fear. I am going to briefly touch on what each of those patterns is, why they are important, and when we would use them. Then we will see an example of how to use MediatR in our projects in C#. 0:00 - Intro 1:01 - What is CQRS 3:49 - What is Mediator 9:00 - Mediator Pattern 12:00 - Create BlazorUI app 13:24 - Create DemoLibrary Class Library 15:25 - When should I implement MediatR? 19:22 - Setting up DataAccess class 25:10 - Setting up BlazorUI app 28:18 - Adding MediatR Package 28:48 - Build out MediatR Setup 29:08 - Setting up Queries 30:08 - Difference between Class and Record 30:51 - Setting up GetAll Query 33:33 - Setting up GetAll Handler 38:30 - Configure StartUp (BlazorUI) 43:21 - Inject and use MediatR in a Razor Page 49:30 - Create DemoApi Web API 50:44 - Configure StartUp 51:52 - Create Controller 52:58 - Inject MediatR 53:26 - Implement HttpGet all 54:16 - Run DemoApi 56:27 - Setting up GetById Query 58:05 - Setting up GetById Handler 1:03:11 - Implement HttpGet by Id 1:04:28 - Run DemoApi 1:05:25 - Setting up Insert Command 1:08:55 - Setting up Insert Handler 1:10:34 - Implement HttpPost 1:12:38 - Run DemoApi 1:13:59 - Recap Source Code: 🤍 Patreon: 🤍 Mailing List: 🤍 Purchase Courses: 🤍

CQRS is probably the cause of the Microservices madness

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Reads and Writes don’t have to live in the same database, data model or even the same service. Let us discuss CQRS no separation one service that does read/write partial separation You can keep one service but backend have multiple connections with different users same database full separation Read services / write services two databases OLAP / OLTP Pros scalability security Cons complex and very hard to follow, what we see with microservices.. resources 🤍 🤍 🎙️Listen to the Backend Engineering Podcast 🤍 🏭 Backend Engineering Videos 🤍 💾 Database Engineering Videos 🤍 🏰 Load Balancing and Proxies Videos 🤍 🏛️ Software Archtiecture Videos 🤍 📩 Messaging Systems 🤍 Become a Member 🤍 Support me on PayPal 🤍 Join our Thriving Backend Community on Discord 🤍 Stay Awesome, Hussein

How to Implement the CQRS Pattern in Clean Architecture (from scratch)

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24.11.2023

📌 Accelerate your Clean Architecture skills: 🤍 🚀 Support me on Patreon to access the source code: 🤍 CQRS, which stands for Command Query Responsibility Segregation, is a popular architectural pattern. In this video, I will show you how to implement CQRS. We'll create custom command and query abstractions required for CQRS. And I'll show you how to implement a use case with a command. I'll also discuss the importance of the CQS principle, which is the precursor to CQRS. Join my weekly .NET newsletter: 🤍 Read my Blog here: 🤍 CQRS Pattern With MediatR: 🤍 Chapters 0:00 What is CQRS? 1:05 CQS Principle 1:55 Logical CQRS architecture 4:03 Adding custom CQRS abstractions 9:09 Implementing a Command use case

Is a REST API with CQRS Possible?

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10.03.2021

If you're developing a HTTP API (what most would call REST) how does that fit along side a Task-Based UI and CQRS? How can you create a REST API with CQRS? For starters, resources don't need to map to Entities. Second, HTTP Methods don't need to map to CRUD. Resources can be whatever you want them to be. In which case, they can be commands and queries. 🔔 Subscribe: 🤍 💥 Join this channel to get access to source code & demos! 🤍 🔥 Don't have the JOIN button? Support me on Patreon! 🤍 📝 Blog: 🤍 👋 Twitter: 🤍 ✨ LinkedIn: 🤍 0:00 Intro 0:43 Entities & CRUD 3:35 Resources 8:12 Sample Application #cqrs #softwarearchitecture #api

CQRS Design pattern training on Saturday and Sunday | CQRS and Mediator Patterns

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26.05.2022

Get complete details from - 🤍 In this online live training we will be doing practical demos on C# Design Patterns & Software Architecture Patterns. - See our other Step by Step video series below :- For more such videos subscribe 🤍 30 Important C# Interview Questions : 🤍 25 Important ASP.NET Interview Questions : 🤍 25 Angular Interview Questions : 🤍 20+ SQL Server Interview Questions : 🤍 10+ Power BI Interview Questions : 🤍 20 PHP Interview Questions : 🤍 5 MSBI Interview Questions : 🤍 Learn Angular tutorial step by step 🤍 ASP.NET MVC Core Interview Questions with answers:- 🤍 C# tutorial for beginners(4 hrs):- 🤍 Learn SQL Server Step by Step 🤍 Learn Azure Step by Step:- 🤍 Azure AZ-900 fundamentals certification :- 🤍 AZ- 204 certification Azure:- 🤍 Learn MVC 5 step by step in 16 hours:- 🤍 Learn Design Pattern Step by Step 🤍 Learn MSBI Step by Step in 32 hours:- 🤍 Python Tutorial for Beginners:- 🤍 Learn Data Science in 1 hour :- 🤍 Learn Power BI Step by Step:- 🤍 - For more details :- 🌐 Website : 🤍questpond.com 📱 Mob. No. : +91-9967590707 / +91 7700975156 / +91-22-49786776 📧Email : questpond🤍questpond.com / questpond🤍gmail.com / questpond🤍yahoo.com Share, Support, Subscribe and Connect us on!!! YouTube: 🤍 Twitter: 🤍 Instagram : 🤍 Facebook : 🤍 #CQRS #CommandandQueryResponsibilitySegregation #designpatterns #softwarearchitecture #csharpdesignpattern #designpatternonlinetraining

Microservice | CQRS Design Pattern with SpringBoot & Apache Kafka | JavaTechie

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05.08.2023

In this tutorial, we will Implement CQRS Design pattern using Spring Boot & Kafka CQRS stands for Command and Query Responsibility Segregation, a pattern that separates read and update operations for a data store. Implementing CQRS in your application can maximize its performance, scalability, and security. 👉 What is CQRS 👉 Why CQRS Problem & Solution 👉 Use-case 👉 Hands on coding implementation #JavaTechie #Microservice #SpringBoot #DesignPattern Spring boot microservice Premium course lunched with 70% off 🚀 🚀 Hurry-up & Register today itself! COURSE LINK : 🤍 PROMO CODE : JAVATECHIE50 GitHub: 🤍 Blogs: 🤍 Facebook: 🤍 Join this channel to get access to perks: 🤍 guys if you like this video please do subscribe now and press the bell icon to not miss any update from Java Techie Disclaimer/Policy: Note : All uploaded content in this channel is mine and its not copied from any community , you are free to use source code from above mentioned GitHub account

Is CQRS Complicated? No, it's simple!

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09.04.2019

Blog: 🤍 Fat Controller CQRS Diet: 🤍 Talk: 🤍 🔔 Subscribe: 🤍 💥 Join this channel to get access to source code, demos, and slides! 🤍 📝 Blog: 🤍 📚 Book Recommendations Domain-Driven Design 🤍 Patterns of Enterprise Application Architecture 🤍 Refactoring: Improving the Design of Existing Code 🤍 Monolith to Microservices: Evolutionary Patterns to Transform Your Monolith 🤍 RESTful Web Clients: Enabling Reuse Through Hypermedia 🤍 CodeOpinon: 🤍 Twitter: 🤍

Implement CQRS Design Pattern with SpringBoot

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16.10.2021

Based on architectural principles, such as Domain-Driven Design (DDD) and Command-Query Responsibility Separation (CQRS), Axon Framework provides the building blocks that CQRS requires and helps to create scalable and extensible applications while maintaining application consistency in distributed systems. Github Link: 🤍 Axon Download Page: 🤍 Event Sourcing: 🤍 RECOMMENDED COURSES - ► Microservices using SpringBoot | Full Example - 🤍 ► Spring Data JPA Tutorial | Full In-depth Course - 🤍 ► Deploy Springboot Microservices to Kubernetes Cluster - 🤍 ► Automate Microservices deployment with Github Actions - 🤍 ► Go / Golang Full Course for Beginners - 🤍 ► Node JS Full Course for Beginners: Learn in 2 Hours - 🤍 ► Express.js Tutorial - Beginner | 2021 - 🤍 ► Redis CLI Tutorial | Complete Course - 🤍 Follow us on : Website: 🤍 Facebook: 🤍 Twitter: 🤍 Instagram: 🤍 GitHub: 🤍 My Laptop : ASUS ROG Zephyrus G14, 14" - 🤍 ASUS ROG Zephyrus G14, 14" (US) - 🤍 Audio Gear : Maono AU-A04 Condenser Microphone : 🤍 Maono AU-A04 Condenser Microphone (US) :🤍 Secondary Audio : Maono AU-100 Condenser Clip On Lavalier Microphone : 🤍 Recommended Books: Mastering Spring Boot 2.0 (Kindle): 🤍 Mastering Spring Boot 2.0 (US) : 🤍 Building Microservices(Kindle) : 🤍 Building Microservices(US) : 🤍 Spring Boot in Action : 🤍 Spring Boot in Action (US) : 🤍 Spring Microservices in Action : 🤍 Spring Microservices in Action(US): 🤍 Music: - Hear the Noise (Sting): 🤍 “Sound effects obtained from 🤍“ #EventDriven #CQRS #Microservices #DailyCodeBuffer

CQRS is simpler than you think with C#11 and .NET 7! - Oskar Dudycz

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16.02.2023

CQRS is often perceived as an over complex pattern with a lot of redundancy and ceremony. Too often it's explained as pushing towards multiple databases, eventual consistency, DDD, and Event Sourcing. In this talk, I will show that it's the opposite. During live coding, I will show how CQRS can help in tackling the layered architecture complexity. I'll build a simple but real WebAPI. Then I'll spice all of that with all the goodies from C#11 and .NET 7 to help achieve that. Records, Nullable Reference Types, Endpoints etc. The main focus will be on CQRS and pure .NET, not Event Sourcing, or DDD. Oskar is a developer, technical team leader, and architect. Oskar started a career before StackOverflow existed. For over 14 years, Oskar has been creating systems close to the business process. Oskar believes that Event-Driven Architectures and Event Sourcing are great ways to achieve that. Oskar is an active open-source developer and one of the Marten library maintainers. Sharing my journey and findings on my blog 🤍 and practical samples at 🤍 This session was recorded at Swetugg Stockholm 2023, Swetugg is run by a group of volunteers with different IT backgrounds with a common denominator: A passion for creating good software and better software developers, no matter if you are just starting your journey or have been writing code since the beginning of unix time.

Clean ASP.NET Core API using MediatR and CQRS | Setup

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02.12.2019

Become a Patreon and get source code access: 🤍 Check out my courses: 🤍 Hello everybody I'm Nick and in this ASP.NET Core tutorial I will show you how you can use CQRS and MediatR to clean up your applications. I will briefly explain what CQRS and the Mediator patterns are and how they apply in our use-case. The I will show you how you can use the MediatR package to decouple your API layer from your application layer, leading to more testable and manageable code. Don't forget to comment, like and subscribe :) Social Media: Follow me on GitHub: 🤍 Follow me on Twitter: 🤍 Connect on LinkedIn: 🤍 #aspnetcore #mediatr #cqrs #tutorial

Discovering The Truth About CQRS - No MediatR Required

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📌 Accelerate your Clean Architecture skills: 🤍 🚀 Support me on Patreon to access the source code: 🤍 CQRS, which stands for Command Query Responsibility Segregation, is the most misunderstood pattern. You don't need any of these things: - Separate read and write databases - Event sourcing - MediatR In this video, I'll show you why CQRS is really simple and how to implement it straightforwardly. Join my weekly .NET newsletter: 🤍 Read my Blog here: 🤍 Subscribe for more: 🤍 Chapters 0:00 In-Memory Repository + API 2:07 Before CQRS, there was just CQS 3:54 What CQRS actually is 8:03 Granular CQRS (without MediatR)

Greg Young — A Decade of DDD, CQRS, Event Sourcing

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11.04.2016

Domain-Driven Design Europe 2016 - Brussels, January 26-29, 2016 🤍 - 🤍 Gregory Young coined the term “CQRS” (Command Query Responsibility Segregation) and it was instantly picked up by the community who have elaborated upon it ever since. Greg is an independent consultant and serial entrepreneur. He has 15+ years of varied experience in computer science from embedded operating systems to business systems and he brings a pragmatic and often times unusual viewpoint to discussions. He’s a frequent contributor to InfoQ, speaker/trainer at Skills Matter and also a well-known speaker at international conferences. Greg also writes about CQRS, DDD and other hot topics on codebetter.com.

Should you use the Repository Pattern? With CQRS, Yes and No!

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27.10.2021

The repository pattern is polarizing. Some developers swear you should always use it to abstract data access logic while others think it's unnecessary if you're using an ORM. So should you use it? My answer is Yes and No! If you're applying CQRS and Vertical Slice Architecture you'll likely want a repository to build up Aggregates. However, for a Query, you may want to just get the data you need rather than an entire aggregate (or collection of aggregates) to build a view model. 🔗 EventStoreDB 🤍 🔔 Subscribe: 🤍 💥 Join this channel to get access to source code & demos! 🤍 🔥 Don't have the JOIN button? Support me on Patreon! 🤍 📝 Blog: 🤍 👋 Twitter: 🤍 ✨ LinkedIn: 🤍 0:00 Intro 0:56 CQRS & Vertical Slices 4:23 Query 7:16 Command #softwarearchitecture #domaindrivendesign #cqrs

Database Patterns: CQRS || What is CQRS? || Database Patterns for Microservices

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05.09.2020

👉What is CQRS - Command Query Responsibility Segregation 👉 Usecase of CQRS 👉 Detailed explanation with real time example Complete video playlist - 🤍 Github page for course plan & Other supporting Docs - 🤍 To get the notification of every upload on the channel hit the subscribe button and if you found the videos useful press like and share the video with your friends. - Other Videos on the channel that you may like - WireMock - EndToEnd API Testing - 🤍 Spring Boot Internals tutorial - 🤍 Serialization In Java tutorial - 🤍 RestApi Validation tutorial - 🤍 Redis Cache + SpringBoot tutorial - 🤍 Ehcache + SpringBoot tutorial - 🤍 Spring Boot Cache tutorial - 🤍 JSON tutorial - 🤍 Spring Cloud Netflix Ribbon - 🤍 Yaml and properties - 🤍 Service registry and discovery - 🤍 Distributed log tracing - 🤍 Communication among microservices using RestTemplate - 🤍 Spring cloud config server - 🤍 Spring cloud gateway - 🤍 Spring cloud OpenFeign - 🤍 Hystrix circuit breaker - 🤍 Resilience4j Circuit breaker - 🤍 Spring Data JPA - 🤍 Spring Boot actuators - 🤍 - Join Us on Social Media - Facebook - 🤍 LinkedIn - 🤍 Twitter - 🤍 Quora - 🤍 Instagram - 🤍 Medium - 🤍 #CQRS #DatabasePatternsForMicroservices #MicroservicesArchitecture #Microservices #DistributedSystems #MicroservicesInterviews #MicroservicesGuide #DemystifyingMicroservices #BreakingMicroservices #MicroservicesConcepts #AllAboutMicroservices Cheers!! Happy Coding!!

DDD, event sourcing and CQRS – theory and practice

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18.10.2018

Numerous software projects fail not only because of the chosen technologies, but above all because of the lack of interdisciplinary communication. Developers and domain experts speak different languages and do not understand each other. In recent years, domain-driven design (DDD) has increasingly established itself as an approach to solving the problem. But how does DDD work and how does it relate to event sourcing and CQRS? The three concepts are often mentioned together, but are in fact independent of each other – but under certain circumstances they can complement each other very well. In the session you unravel the weave together with Golo Roden. He will also show you how to develop a cloud application with JavaScript based on DDD, event sourcing and CQRS. Session by Golo Roden at iJS 2018 😊 Come, join us at the next International JavaScript Conference | 🤍 👉 Follow us on Twitter | 🤍 👍 Like us on Facebook | 🤍

.NET 7 💥 - Intro to CQRS and MediatR with ASP.NET Core Web Api

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In this video we will be going to learning about CQRS and MediatR with .NET Web API. Support me on Patreon to access the source code: 🤍 Base App: 🤍 Let us connect: 🌍 My website - 🤍 📸 Instagram - 🤍 🐦 Twitter - 🤍 ♯ Github - 🤍 🎫 LinkedIn - 🤍 💥 LinkTree - 🤍 Gear I use (affiliate link): 🤍 Support my work: 🤍 🤍 Hire Me: 🤍 WHO AM I: I'm Mohamad, a Enterprise Architect working in Manchester, UK. I make videos about web, cloud, desktop and mobile development. GET IN TOUCH: If you’d like to talk, I’d love to hear from you. Tweeting 🤍moe23 directly will be the quickest way to get a response, but if your question is very long, feel free to email me at hello🤍mohamadlawand.com. #dotnet #mediatr #cqrs

In-depth intuition on Command Query Responsibility Segregation (CQRS) pattern

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12.11.2022

Command query responsibility segregation (CQRS) is a programming design pattern that treats retrieving data and changing data differently. This video explains about this pattern in-depth. Learn System Design with AWS: - 🤍 Check this playlist for more Data Engineering related videos: 🤍 Snowflake Complete Course from scratch with End-to-End Project with in-depth explanation 🤍 🙏🙏🙏🙏🙏🙏🙏🙏 YOU JUST NEED TO DO 3 THINGS to support my channel LIKE SHARE & SUBSCRIBE TO MY YOUTUBE CHANNEL

Ануар Нурмаканов — Event Sourcing и CQRS на конкретном примере

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11.07.2018

Ближайшая конференция: Joker 2023, 9–10 октября (Online), 13–14 октября (Offline, Санкт-Петербург) Подробности и билеты: 🤍 — — . . . . Что такое Event Sourcing и зачем нам CQRS? Все слышали об этих двух парадигмах — теперь пора разобраться конкретнее, как реализовать их. В докладе будет и мотивировано решение обратиться к Event Sourcing, и разобран небольшой конкретный пример, в котором это всё работает с PostgreSQL и ElasticSearch.

Clean Architecture With .NET 6 And CQRS - Project Setup

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11.08.2022

📌 Accelerate your Clean Architecture skills: 🤍 🚀 Support me on Patreon to access the source code: 🤍 You've heard about Clean Architecture before? In this video, I'm going to show you how to set up the Clean Architecture using .NET 6 and CQRS with MediatR. How I Approach Clean Architecture Folder Structure 🤍 Join my weekly .NET newsletter: 🤍 Subscribe for more: 🤍 Chapters 0:00 Introduction 0:19 What is the Clean Architecture? 2:51 Domain layer 5:01 Application layer 7:26 Infrastructure layer 8:25 Presentation layer 12:02 Outro

Building Event-Driven Microservices with Event Sourcing and CQRS - Lidan Hifi

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15.08.2018

Most systems today store only the current state of their business entities. However, you can look at the current state through a different lens, as a derivative of previous behaviors. Storing past behaviors as a sequence of events, instead of the current state of the entity, will gain you accurate audit logging, history revisions, flexible schemas and more. The current state is derived by replaying the events. Event Sourcing is a great way to implement event-driven applications, and it’s often combined with CQRS (Command Query Responsibility Segregation) which is a key part of an architecture that is based on event sourcing. In this talk, Lidan will cover the principles of Event Sourcing pattern, how to model your data accordingly and how you can improve your system by segregating reads and writes using specialized read models. You’ll learn how these concepts fit in with event-driven microservices through a real-life example - an invoice management app we built at Wix. NDC Conferences 🤍 🤍

Mini Course #1 Clean Architecture + CQRS

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08:42:40
15.11.2021

CQRS + Clean architecture in-depth, hopefully you're going to enjoy it! :) More content at: 🤍 Join our Discord: 🤍 Follow us: 🤍 🤍 🤍 Source Code: 🤍 Course Trailer: 🤍 = Timecodes 00:00:00 - Intro 00:01:10 - Why do we record this course? 00:04:39 - Layered architecture: Why I don't like it anymore? 00:27:27 - Clean architecture 00:38:16 - Course prerequisites (still can't pronounce it correctly) 00:42:30 - What do we build? 00:45:18 - *Domain Layer* 00:49:57 - Entity 01:00:20 - Primitive obsession code smell 01:03:20 - Value Object 01:10:54 - Custom exceptions 01:33:25 - Domain model validation 01:38:55 - Aggregate 01:50:50 - Domain event 02:14:30 - Factory 02:28:50 - Policy 02:43:50 - Repository 02:48:55 - Domain Layer: Summary 02:56:45 - CQS: Command Query Separation 03:07:46 - CQRS: Command Query Responsibility Segregation 03:29:48 - *Application Layer* 03:30:25 - Command/Command Handler/Command Dispatcher definitions 03:40:45 - Automatic command handlers registration 03:44:12 - Application & Domain registration 03:50:52 - Command 03:55:31 - Command Handler 04:01:11 - Where to put methods related to reading? 04:07:00 - Read Service 04:14:14 - Weather Service 04:28:25 - Overview of the other commands & command handlers 04:34:35 - Query/Query Handler/Query Dispatcher definitions 04:44:37 - Automatic query handlers registration (BONUS: example of copy/paste pattern) 04:52:50 - How to tackle reading on Query side? 05:06:30 - *Infrastructure Layer* 05:07:56 - Configuration of Entity Framework Core 05:15:15 - Read Models 05:19:05 - ReadDbContext & WriteDbContext 05:24:13 - EF Entity Configuration 05:42:37 - DbContexts registration 05:55:51 - Query Handlers 06:12:18 - Repository implementation on top of EF Core 06:16:45 - Read Service implementation on top of EF Core 06:19:00 - Dummy Weather Service implementation 06:23:20 - EF Migration 06:29:50 - Applying EF migrations automatically 06:39:38 - *Presentation Layer* 06:41:35 - Controller 06:50:43 - How to return ID of resource in CQRS approach? 07:00:02 - Testing API 07:09:29 - *Cross Cutting Concerns* 07:09:30 - Error Handling 07:20:49 - Logging 07:34:57 - *Unit Testing* 07:42:34 - Unit Test on Domain Layer 08:09:45 - Unit Test on Application Layer 08:34:00 - Summary

What Is CQRS? | Microservice CQRS Explained In 1 Minute | #Shorts | Simplilearn

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*Note: 1+ Years of Work Experience Recommended to Sign up for Below Programs⬇️ 🔥Explore our FREE Courses: 🤍 When it comes to creating software architecture at scale, understanding common architectural patterns is crucial. They not only save time but also ensure that your concept is implemented correctly. When an architectural pattern exists that corresponds to the architecture you're constructing, there's no need to recreate the wheel. So here is a short video on What is CQRS, and why it’s popular to give you an overview of this interesting concept. ✅Subscribe to our Channel to learn more about the top Technologies: 🤍 ⏩ Check out the Design Thinking training videos: 🤍 #WhatIsCQRS #MicroserviceCQRSExplainedIn1Minute #MicroserviceCQRS #CQRSMicroservices #DataBaseMicroservices #commandQueryResponsibilitySegragation #DBMSTutorialForBeginners #Shorts #Simplilearn SQL Certification Training Course: Master SQL and improve your career prospects with Simplilearn’s SQL Database Training Course. Functional knowledge of SQL (Structured Query Language), the leading programming language for relational database management systems, is in high demand and can set you apart in the job market. This SQL certification course gives you all of the information you need to successfully start working with SQL databases and make use of the database in your applications. Learn how to correctly structure your database, author efficient SQL statements, and clauses, and manage your SQL database for scalable growth. Key Features: ✅ In-depth coverage of SQL fundamentals ✅ Covers all of the important query tools and SQL commands ✅ Industry-recognized course completion certificate ✅ Lifetime access to self-paced learning Benefits: SQL, though an old language, is highly significant today as companies across the world are gathering massive amounts of data for their growth. SQL consistently ranks high in the most-requested tech skills and learning it will add great value to your array of skills. Eligibility: This online SQL certification course is ideal for freshers, programmers, software developers, and testing professionals who want to learn SQL. It’s also ideal for marketing professionals and salespeople who want to better understand their company’s data. Pre-requisites: There are no prerequisites for this database training course. This course can be taken up by anyone who wants to learn SQL. 👉Learn more at: 🤍 For more updates on courses and tips follow us on: - Facebook: 🤍 - Twitter: 🤍 - LinkedIn: 🤍 - Website: 🤍 Get the Android app: 🤍 Get the iOS app: 🤍 🔥🔥 Interested in Attending Live Classes? Call Us: IN - 18002127688 / US - +18445327688

Learn CQRS Design Pattern | CQRS Pattern C# | CQRS Design Pattern Tutorial | CQRS Design Pattern C#

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Learn CQRS Design pattern Design & Architecture Pattern in Mumbai offline 🤍 For more such videos visit 🤍 Buy Full Design Pattern course from 🤍 See our other Step by Step video series below :- JavaScript Interview Questions: 🤍 Learn Design Pattern Step by Step 🤍 C# interview questions and answers:- 🤍 ASP.NET MVC Interview Questions with answers:- 🤍 Angular Interview Questions and Answers :- 🤍 C# tutorial for beginners(4 hrs):- 🤍 Learn Azure Step by Step:- 🤍 Azure AZ-900 fundamentals certification :- 🤍 AZ- 204 certification Azure:- 🤍 Learn Angular tutorial step by step 🤍 Learn MVC 5 step by step in 16 hours:- 🤍 Learn MSBI Step by Step in 32 hours:- 🤍 Learn SQL Server Step by Step 🤍 Python Tutorial for Beginners:- 🤍 Learn Data Science in 1 hour :- 🤍 Learn Power BI Step by Step:- 🤍 PHP Interview Questions : 🤍 Preparing for C# / .NET interviews start here 🤍 Lab 1:- Design pattern step by step with a project(Factory pattern,Lazy Pattern and RIP Pattern).(60 minutes). 🤍 Lab 2:- Unity, Stratergy, IOC, SRP and SOC design pattern. (30 minutes) trailer video 🤍 Lab 3 :- Generic repository pattern and Template pattern ( 1 hour) trailer video 🤍 Lab 4: - Adapter Pattern and Repository with EF (1 hour) trailer video 🤍 Lab 5: - UOW(Unit of Work)(30 minutes) trailer video 🤍 Lab 6:- Decorator Pattern (30 Minutes) trailer video 🤍 Lab 7 :- Iterator Pattern (30 Minutes) trailer video 🤍 Lab 8 :- Prototype and Memento Pattern (30 Minutes) Trailer video 🤍 Lab 9:- Implementing complex object creation using Factory Method(1 Hour)Trailer video 🤍 Lab 10 :- Implementing NULL Design Pattern and Mediator Pattern.(34 Minutes)Trailer Video 🤍 Lab 1:- Design pattern step by step with a project(Factory pattern,Lazy Pattern and RIP Pattern).(60 minutes) Lab 2:- Unity, Stratergy, IOC, SRP and SOC. (30 minutes) Lab 3:- Template pattern and Repository pattern with ADO.NET.(60 minutes) Lab 4: - Adapter Pattern and Repository with EF(60 minutes) Lab 5: - UOW(Unit of Work)(30 minutes) Lab 6:- Decorator Pattern (30 Minutes) Lab 7 :- Iterator Pattern(25 Minutes) Lab 8:- Prototype and Memento Pattern(25 Minutes) Lab 9:- Implementing complex object creation using Factory Method(1 Hour) Lab 10 :- Implementing NULL design pattern and Mediator pattern. Explain SOLID? Introduction Factory and Abstract Factory pattern. Builder Pattern Prototype Pattern Singleton Pattern Adapter Pattern Bridge Pattern Composite Pattern Decorator Pattern Facade Pattetrn Flyweight Pattern Proxy Pattern Mediator Pattern Memento Pattern Interpreter Pattern Iterator Pattern COR Pattern Command Pattren State Pattern Strategy Pattern Observer Pattern Template Pattern Visitor Pattern Explain IOC(Inversion of Control)? Dependency Injection Fluent interface and method chaining Lazy Loading Explain RIP(Replace IF with Polymorphism) Pattern? Immutable object design pattern Explain Null Design Pattern and its usage. What is Microservices Architecture? Design pattern Source Code Happy Learnings from Questpond. - For more details :- 🌐 Website : 🤍questpond.com 📱 Mob. No. : +91-9967590707 / +91 7700975156 / +91-22-49786776 📧Email : questpond🤍questpond.com / questpond🤍gmail.com / questpond🤍yahoo.com Share, Support, Subscribe and Connect us on!!! YouTube: 🤍 Twitter: 🤍 Instagram : 🤍 Facebook : 🤍 #LearnCQRS #CQRSDesignPattern #CQRSDesignPatternTutorial #CQRSDesignPatternTraining #DesignPatternsCSharp #DesignPatternTraining #LearnDesignpatternStepbyStep

CQRS and MediatR In ASP.NET Core

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There were some changes in the newest version of MediatR, so we strongly recommend reading our article: 🤍 to see how to fix some issues that you will face following this video. Want to learn more about building APIs and getting a six-figure income? Check out: ►► OUR BOOK: 🤍 ►► OUR BLAZOR WEBASSEMBLY COURSE: 🤍 ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ DESCRIPTION: In this video, we are going to provide a brief introduction to the CQRS pattern, and how the .NET library MediatR helps us build software with this architecture. 0:00 Introduction 4:19 MediatR Implementation 11:58 Requests With MediatR 16:29 MediatR Commands 27:58 MediatR Notifications 34:30 MediatR Behaviors ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ LINKS MENTIONED IN THE VIDEO: To visit the whole article, mentioned in the video ►► 🤍 For the mentioned videos Handling GET requests: ►► 🤍 Handling POST, PUT, and DELETE Requests: ►► 🤍 ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ FOLLOW US ON SOCIAL MEDIA! ►► 🤍 ►► 🤍 ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ VIDEO SUMMARY: CQRS and the Mediator Pattern The MediatR library was built to facilitate two primary software architecture patterns: CQRS and the Mediator pattern. Whilst similar, let’s spend a moment understanding the principles behind each pattern. CQRS. CQRS stands for “Command Query Responsibility Segregation”. As the acronym suggests, it’s all about splitting the responsibility of commands and queries into different models. If we think about the commonly used Create-Read-Update-Delete pattern, usually we have the user interface interacting with a datastore responsible for all four operations. CQRS would instead have us split these operations into two models, one for the queries - read operations, and another for the commands - create update and delete operations. The CQRS pattern makes no formal requirements of how this separation occurs. It could be as simple as a separate class in the same application, all the way up to separate physical applications on different servers. That decision would be based on factors such as scaling requirements and infrastructure, so we won’t go into that decision path today. The key point being is that to create a CQRS system, we just need to split the reads from the writes. So, what problems do we solve with it? Well, when we design a system, we start with data storage. We perform database normalization, add primary and foreign keys to enforce referential integrity, add indexes, and generally ensure the “write system” is optimized. This is a common setup for a relational database such as SQL Server or MySQL. Other times, we think about the read use cases first, then try and add that into a database, worrying less about duplication or other relational DB concerns. Neither approach is wrong. But the issue is that it’s a constant balancing act between reads and writes, and eventually one side will “win out”. All further development means both sides need to be analyzed and often one is compromised. CQRS allows us to “break free” from these considerations, and give each system the equal design and consideration it deserves, without worrying about the impact of the other system. This has tremendous benefits on both performance and agility, especially if separate teams are working on these systems. Mediator Pattern After CQRS, let’s talk a bit about the Mediator pattern. The Mediator pattern is simply defining an object that encapsulates how objects interact with each other. Instead of having two or more objects take a direct dependency on each other, they instead interact with a “mediator”, who is in charge of sending those interactions to the other party. We can see that SomeService sends a message to the Mediator, and the Mediator then invokes multiple services to handle the message. There is no direct dependency between any of the blue components. The reason the Mediator pattern is useful is the same reason a pattern like Inversion of Control is useful. It enables “loose coupling”, as the dependency graph is minimized and therefore code is simpler and easier to test. In other words, the fewer considerations a component has, the easier it is to develop and evolve. Now that we’ve been over some theory, let’s talk about how the MediatR package makes all these things possible.

CQRS Myths | 3 Most Common Misconceptions

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Here are the 3 most common myths I constantly see about CQRS when it's explained in blog posts or videos. This video explains exactly what CQRS is, as well as what it is not. 🔔 Subscribe: 🤍 💥 Join this channel to get access to source code & demos! 🤍 🔥 Don't have the JOIN button? Support me on Patreon! 🤍 📝 Blog: 🤍 👋 Twitter: 🤍 ✨ LinkedIn: 🤍 Greg Young Archived Posts: 🤍 🤍 0:00 Intro 0:50 CQRS Definition by Greg Young 3:06 Myth #1: Multiple Databases 3:55 Myth #2: Event Sourcing 4:40 Myth #3: Async Messaging 5:20 CQRS is NOT 6:10 Feedback/Comments #cqrs #softwarearchitecture #softwardesign

CQRS + Event Sourcing: A introdução que você precisava

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23.11.2022

Nesse vídeo vamos falar sobre CQRS (Command Query Responsibility Segregation) e Event Sourcing. Entre os dias 06 a 13 de Fevereiro vai rolar a Imersão Full Stack & Full Cycle, um evento online e 100% gratuito onde eu vou te mostrar como trabalhar com aplicações de grande porte e ter um dos perfis mais desejados e bem pagos do mercado. → Inscreva-se gratuitamente aqui: 🤍

CQRS com Rodrigo Branas + Sobre o Curso Full Cycle 3.0

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12.02.2022

Reserve sua matrícula no Curso Full Cycle: 🤍

CQRS & MediatR | ASP.NET 6 REST API Following CLEAN ARCHITECTURE & DDD Tutorial | Part 6

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10.07.2022

Link to the full playlist: 🤍 Become a Patreon & get the source code: 🤍 Follow me on 'em socials: Twitter: 🤍 LinkedIn: 🤍 GitHub: 🤍 What is this series? We'll build a REST API following Clean Architecture & Domain-Driven Design principles completely from scratch. We will use .NET 6, EF Core, and common patterns such as CQRS, unit of work, repository, mediator, and more 💪🏽 We'll also use some awesome open-source libraries such as MediatR, FluentValidation, ErrorOr, Throw, Mapster, and more. The developing environment will be visual studio code & dotnet CLI only. We will use awesome vscode plugins for everything from sending HTTP requests to connecting to our SQL database, debugging, and peeking at JWT tokens. We will code and refactor multiple times to tackle the many concepts I want to teach. When the series will be over, you'll have a good understanding and intuition on how to use these patterns & libraries in your industry-level applications. How often will a new part come out? Once or twice a week. What are we doing today? Today we'll split our application logic following the CQRS Design Pattern. Then, we'll introduce the package MediatR which will play nicely with this Design Pattern and help us split our logic by feature, which will make the use cases in our application layer clear. Give MediatR a ⭐: 🤍 #dotnet 00:00. CQS (Command Query Separation) 01:40. CQRS (Command Query Responsibility Segregation) 02:27. CQS & CQRS Misconceptions 03:18. Implementing CQRS 06:57. The Problem with CQRS in large systems 07:33. Splitting the logic by Feature 09:07. MediatR NuGet package 10:02. Implementing MediatR Command 11:35. Implementing MediatR Command Handler 13:07. Implementing MediatR Query 13:36. Implementing MediatR Query Handler 14:30. MediatR Dependency Injection 16:12. Using the Mediator object 16:34. Mediator pro tip 18:00. Domain Models with CQRS Query path

CQRS بالعربي with Mohammed Yahia & Ahmed Elemam - Tech Podcast بالعربي

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What is CQRS in Event Sourcing Patterns? CQRS - Command and Query Responsibility Segregation

4. HLD SAGA Pattern | Strangler Pattern | CQRS | Microservices Design Patterns | System Design

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18.07.2022

Hi, This is the PART-2 video of Microservices Architecture and its Design patterns. Its a very important Hight level design topic #saga #systemdesign In this video we have explained : - what is Strangle Pattern - What is SAGA Pattern - What is CQRS pattern - Checkout the others series: 👉Interview Experiences : 🤍 👉Low Level Design: 🤍 👉High Level Design: 🤍 👉Interview Coding Questions: 🤍 👉Talk with Employees: 🤍 LIKE | SHARE | SUBSCRIBE 😊

شرح CQRS بالعربي

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15.04.2020

لو انت بتطور انظمة وساعات كتير بتواجهك مشاكل في الاداء سواء في الكتابة او الاستعلام فاليك احد الوسائل اللي ممكن تساعدك على تحسين الاداء بشكل كبير وهي ال CQRS كمان في الفيديو هنتكلم عن بعض التحديات اللي بتقابلها في انظمة بتستخدم ال Event Sourcing استكمالا ففيديو السابق الخاص بال Event Sourcing

CQRS em 10 minutos // Dicionário do Programador

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09.11.2021

🚀 𝗛𝗢𝗦𝗧𝗚𝗔𝗧𝗢𝗥 → 🤍 Alterar e consultar dados ao mesmo tempo pode até parecer "simultâneo" em alguns casos, mas quando se aumenta o número de usuários isso pode ser uma dor de cabeça gigante. Não caia mais nos mesmos problemas que muitos outros projetos de software já passaram. Por isso existem os patterns. A CQRS é um pattern arquitetural já consolidado há muito tempo criado justamente para resolver essa situação. Entenda nesse vídeo qual é a ideia por trás dela. 📰 𝗖𝗼𝗺𝗽𝗶𝗹𝗮𝗱𝗼: 𝗡𝗼𝘀𝘀𝗮 𝗡𝗲𝘄𝘀𝗹𝗲𝘁𝘁𝗲𝗿 → 🤍 📡 𝗦𝗶𝗴𝗮 𝗮𝘀 𝗿𝗲𝗱𝗲𝘀 𝗱𝗼 𝗖𝗗𝗙𝗧𝗩 → 🤍 📸𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 → 🤍 ☕ 𝗖𝗹𝘂𝗯𝗲 𝗱𝗼𝘀 𝗖𝗗𝗙𝘀 𝗻𝗼 𝗬𝗼𝘂𝘁𝘂𝗯𝗲 → 🤍 ▸ 𝗛𝗢𝗦𝗧𝗚𝗔𝗧𝗢𝗥 📢 Vagas e Oportunidades: 🤍 𝑵ó𝒔 ❤️ 𝒓𝒆𝒄𝒆𝒃𝒆𝒓 𝒑𝒓𝒆𝒔𝒆𝒏𝒕𝒆𝒔, 𝒄𝒂𝒓𝒕𝒂𝒔, 𝒃𝒓𝒊𝒏𝒅𝒆𝒔 𝒆 𝒎𝒊𝒎𝒐𝒔. Caixa Postal: 91735 - Cep: 25620-972 Petrópolis / RJ 💻 Edição e Áudio: RW Studio 🔗 Um vídeo do site Código Fonte #CQRS #Pattern #ArquiteturaDeSoftware

Aprende CQRS en 10 minutos!

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CQRS es un patrón de Arquitectura muy popular en implementaciones de Microservicios. En este video podrás aprender CQRS en 10 minutos, además de otros conceptos como Event Sourcing, Event Driven Design y Event Store. Aprende CQRS en 10 minutos ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 💥ME ENCUENTRAS TAMBIÉN AQUÍ 👇 Sitio Web ►🤍 Twitter ► 🤍 Discord ► 🤍 ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 💻 CURSOS PREMIUM 👇 🚀Curso Completo de C# desde Cero ► 🤍 🚀Curso de C# Práctico en 15 Proyectos ► 🤍 🚀Curso de C# en el Backend - API Mastery ► 🤍 🔥 Curso Completo de Blazor desde Cero ► 🤍 🔥 Blazor Ultimate: Domina Blazor en 4 Proyectos ► 🤍 👉Curso Práctico de SQL para principiantes ►🤍 📚 Curso de GIT y Github para Principiantes ► 🤍 Descuento del 60% en todos mis cursos 👉 🤍 ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 📚 RECURSOS RECOMENDADOS 👇 ¿QUIERES APRENDER INGLÉS?👇 Italki ► $10 de regalo con tu primera compra 👉 🤍 Busuu ► App gratis con descuento para su sección Premium 👉🤍 Dominios ► Namecheap: 👇 👉 🤍 Hosting ► Bluehost: 👇 👉 🤍 Nota: Los links en la descripción son links de afiliado, lo que significa que recibiré una pequeña comisión si te registras usando esos links sin ningún costo extra para ti. Todos los links de afiliados son productos o servicios en los que creo y uso personalmente. Music from 🤍 "Blippy Trance" by Kevin MacLeod (🤍) License: CC BY (🤍

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