An Elegant C# Data Access Layer using the Template Pattern and Generics. The GOF Template pattern coupled with . NET 2. 0 Framework generics provides an awesome synergistic alliance. The Template pattern deals with repetitive coding within a class. Template Pattern + Generics = Mapping Synergy.
Where is the one place where we all do the same thing over- and- over (and over) again? I won't bore you with it here). There are two things we do repeatedly when accessing data. Let's look at the mapping part first because it's the easier one of the two. Building a Glitterhouse. Note from Editor: Howard Lamey, in Jacksonville, Florida, has retired from a full-time job in advertising that included designing window. An alternative method of creating garments to using patterns constructed in standard sizes, is to construct a pattern using custom measurements - this results in a. We will now explain the Template Method Pattern. Like the Strategy Pattern, this pattern is part of the behavioral design patterns. As the name Template suggests, we. Welcome to Objects on Rails. This text is a step-by-step walkthrough following the construction of a simple web application using Ruby on Rails. Let's move it to My. SQL! Here is our mapper base object. Template Pattern + Generics = Data. Access Synergy. The other thing we have to do is actually hit the database with a request and get the IData. Reader back. We'll put this in an abstract object implementing the Object. Reader. Base< T>. Object. Reader. With. Connection< T> : Object. Reader. Base< T>. Mapping Synergy + Data. Access Synergy = Elegant Code. The important thing to realize is that we have completely separated out normally repetitive code which will make for much easier maintenance because of a smaller code base. Conclusion. So now you have the general idea you can use it as a base to build a DAL. There are many places to improve upon this approach such as using an identity map (yet another awesome Fowler pattern) to avoid unnecessary database hits or a better way to get the IDb. Connection, such as using the strategy pattern and maybe using a factory, or how about a facade pattern to expose all of this functionality through one object... Hyde Park Group Food Innovation. We are a strategic consulting company providing product and menu development, market research and content marketing services to packaged food companies and restaurant chains.
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