Download Applying Domain-Driven Design and Patterns: With Examples in by Jimmy Nilsson PDF

By Jimmy Nilsson

Making use of Domain-Driven layout and styles is the 1st whole, useful consultant to leveraging styles, domain-driven layout, and test-driven improvement in .NET environments. Drawing on seminal paintings by means of Martin Fowler and Eric Evans, Jimmy Nilsson indicates how one can customise real-world architectures for any .NET program. you are going to the right way to arrange area versions for program infrastructure; help company ideas; supply endurance help; plan for the presentation layer and UI trying out; and layout for carrier orientation or point orientation. Nilsson illuminates each one precept with transparent, well-annotated code examples in keeping with C# 2.0, .NET 2.0, and SQL Server 2005. His examples could be invaluable either to C# builders and people operating with different .NET languages and databases -- or maybe with different systems, akin to J2EE.

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This certainly has its strengths, especially in environments when you have decent implementations for the Recordset pattern. One problem, though, is that it also has a tendency to introduce duplication between different Table Modules. Another drawback is that you typically can't use polymorphistic solutions to problems because the consumer won't see the object identities at all, only value-based identities. It's a bit like using the relational model instead of the object-oriented model. Domain Model instead uses object orientation for describing the model as close to the chosen abstractions of the domain as possible.

The way I did the bridging was to have one class per use case in the software. It did come to my attention that thanks to my way of applying use cases, I became pretty procedural in my thinking. I was designing a little bit like Transaction Script [Fowler PoEAA], but I tried to balance it by generalizing as much behavior as possible (or at least suitable). A few years ago I heard Ivar Jacobson talking about use cases, and I was pretty surprised when I realized that he didn't encapsulate the use cases in classes of their own as I had expected and had done for a long time.

In a relational model it is normally alright to have one table called People (plural is the de facto name standardat least among database peopleto make it obvious we are dealing with a set). Note If I'm picky, I should use the word "relation" instead of "table" when I'm talking about the relational model. The table has three columns (probably more, but so far we have only talked about the phone numbers) representing one primary key and two phone numbers. Perhaps there could be five columns, because we might want to break down the phone numbers into two columns each for area code and local number, or seven if we add country code as well.

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