Caffeinated Wisdom

Most Domain Driven Design articles and books teach you to develop your business logic in such a way that there is no trace of a database or other dependency that would make your business logic (also known as Core code or Domain Logic) impure. That is great advice if you are developing your core business logic in a programming language that is not SQL . But what if all you know if SQL or SQL is your strong skill? The answer is yes, you can develop your domain logic in SQL in a domain driven way, if you try to adhere to the spirit of the DDD concepts. Objects or Tables? One of the main arguments for developing Domain Logic in Object-Oriented languages is that “real” world things are objects and thus is easier to model those real-world things in classes. But if you are in an organization and you start talking to Business Units about the logic they need, you would find that the concept of “spread sheets” are actually very familiar to them. It is so familiar, that countless of Business Unit

HTTP-based APIs have become a very popular way of exposing functionality to external entities outside an organization. For example, in order to support certain features of their products, some Vendors require integrating with your data real-time by calling HTTP APIs to get the information they need. Or maybe you have a very tech-savy customer that would like to get their data via APIs your organization exposes. Typically, a Development Team spins up those APIs using programming languages and platforms such as .NET and Java. But what if your organization only has Microsoft SQL developers? In this series of posts, I would like to propose that they are able to encapsulate the needed logic into T-SQL stored procedures and/or views without the need of the work of a typical development team. This is great for those “multiple hats” DBAs who might not be strong enough in regular languages, but with good enough skills to do some basic managing in Azure. Here is an overview of the process: Desig