Adventures in .NET
What is Command Query Responsibility Segregation (CQRS) with Derek Comartin - .NET 213
Jan 7, 2025
Derek Comartin, a developer at a Canadian transportation software startup, dives into the intricacies of Command Query Responsibility Segregation (CQRS). He outlines its benefits and potential downsides while sharing real-world applications. The discussion simplifies CQRS and domain-driven design, making it accessible to the audience. Derek also addresses the relationship between CQRS and event sourcing, emphasizing the importance of separating read and write operations. Plus, he shares personal favorites in media and activities, keeping the conversation lively and engaging.
50:14
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Quick takeaways
- CQRS separates data reading and writing, enhancing software architecture by allowing teams to focus on user intents rather than CRUD operations.
- Implementing CQRS encourages decoupling dependencies and makes migrating to new technologies easier through the use of a mediator pattern.
Deep dives
Understanding CQRS
CQRS, or Command Query Responsibility Segregation, is a software design pattern that separates the operations for reading data from those for writing data. At its core, it builds on the concept of CQS, which suggests that every method should either change state or return a value without side effects. The speaker outlines that many misconceptions surround CQRS, often due to overcomplicated visual representations found online which include unnecessary components like service buses and event stores. Instead, CQRS should be understood in its simplest form: dividing the ways the application processes commands (writing) from the ways it handles queries (reading).
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