ASP.NET Dynamic Data Unleashed (Tim Cox's Library) by Oleg Sych

Author:Oleg Sych
Language: eng
Format: epub
Publisher: Sams Publishing
Published: 2012-04-30T04:00:00+00:00

Entity Design

Entities are abstractions of things in the business domain. They are implemented as classes in the application and as tables in the database. Although some similarities exist (class properties are similar to table columns for instance), the object-oriented and relational models are very different. The ADO.NET Entity Framework, LINQ to SQL, and other frameworks attempt to bridge the gap between these two radically different ways of representing information by implementing object-relational mapping.

Good entity design requires application of both object-oriented and relational design principles. It would be foolish to try addressing both of these vast topics in this chapter, or even in this book. It is assumed that you already know how to create a class that represents a real-world object or person and use encapsulation and abstraction principles to expose its key attributes as properties. It is also assumed that you know how to create a table to store this information in the database and use normalization techniques to reduce duplication. With these assumptions in mind, this section focuses on practical application of the object-oriented and relational design principles and some of the common pitfalls developers encounter with the Entity Framework.

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