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But the issue is that it’s a constant balancing act between reads and writes, and eventually one side will “win out”. 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 (often “document databases” are used for these patterns). This is a common setup for a relational database such as SQL Server or MySQL. We perform database normalization, add primary and foreign keys to enforce referential integrity, add indexes, and generally ensure the “write system” is optimized. Well, a common reason is often when we design a system, we start with the data storage. The key point being is that to create a CQRS system, we just need to split the reads from the writes. That decision would be based on factors such as scaling requirements and infrastructure, so we won’t go into that decision path today. It could be as simple as a separate class in the same application (as we’ll see shortly with MediatR), all the way up to separate physical applications on different servers. The CQRS pattern makes no formal requirements of how this separation occurs. The following image illustrates how this works:Īs we can see, the Application simply separates the query and command models. CQRS would instead have us split these operations into two models, one for the queries (aka “R”), and another for the commands (aka “CUD”). If we think about the commonly used CRUD pattern (Create-Read-Update-Delete), usually we have the user interface interacting with a datastore responsible for all four operations. As the acronym suggests, it’s all about splitting the responsibility of commands (saves) and queries (reads) into different models. CQRSĬQRS stands for “Command Query Responsibility Segregation”. Whilst similar, let’s spend a moment understanding the principles behind each pattern.
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The MediatR library was built to facilitate two primary software architecture patterns: CQRS and the Mediator pattern. Working with Commands that Return a Value.Setting up an ASP.NET Core API with MediatR.How MediatR facilitates CQRS and Mediator Patterns.This article is divided into the following sections:
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Professional multimedia authoring tool.The source code for this article can be found on the CQRS and MediatR in ASP.NET Core. You can also package your project as a SCORM course for upload to a SCORM-compliant server. Simply select Flash and your Flash project is ready. When creating Flash files no Action scripting is needed.
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