Chris Pietschmann

husband, father, hacker, entrepreneur, futurist, innovator, autodidact

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CQRS: Command Query Responsibility Segregation Design Pattern

I was recently turned onto the Command Query Responsibility Segregation (CQRS) design pattern by a co-worker. One of the biggest benefits of CQRS is that is aids in implementing distributed, highly scalable system. This notion can be intimidating, but at the heart of CQRS there are rather simple guidelines to follow. Now let's dive in and explore what this pattern is and some way of implementing it. Purpose of Command Query Responsibility Segregation (CQRS) The main purpose of CQRS is to assist ... [More]

‘SQL Query’ Micro Design Pattern

There are a few programming practices, that I like to call Micro Design Patterns, that I use over and over again on various software projects I work on. One pattern that I call SQL Query, and use quite frequently when I need to write ad-hoc SQL queries for use within a Data Access Layer. This pattern lends itself to easier testability and a cleaner separation of concerns. What is the ‘SQL Query’ Micro Pattern? Basically, the SQL Query micro pattern involves using a Factory Method to return an ... [More]

Design Patterns: Basics of Dependency Injection

Dependency Injection and Inversion of Control (IoC) have become popular buzz words in the .NET development world over the last couple years. However, It seems that not very many developers really know what they are. Like most design patterns they are rather simple in idea, but the various implementations can become complex to someone new to them. Also, it seems that these two are often considered that they must go together or even mistaken as the same thing. This prompted me to write up this sho... [More]