Agile Database Techniques: Effective Strategies for the by Scott W. Ambler

By Scott W. Ambler

* Describes Agile Modeling pushed layout (AMDD) and Test-Driven layout (TDD) methods, database refactoring, database encapsulation recommendations, and instruments that aid evolutionary strategies* Agile software program builders usually use item and relational database (RDB) know-how jointly and therefore needs to conquer the impedance mismatch* the writer covers concepts for mapping gadgets to RDBs and for enforcing concurrency keep watch over, referential integrity, shared company common sense, safeguard entry regulate, reviews, and XML* An agile origin describes primary abilities that each one agile software program builders require, really Agile DBAs* comprises item modeling, UML facts modeling, information normalization, type normalization, and the way to accommodate legacy databases* Scott W. Ambler is writer of Agile Modeling (0471202827), a contributing editor with software program improvement (www.sdmagazine.com), and a featured speaker at software program meetings around the world

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Who knows? Perhaps this profile will become a “grass roots” defacto standard. 2 or simply as free-form text in a UML note. 3. 4. Class boxes that appear on conceptual and logical data models are by definition entities, so the stereotype is optional. Similarly, on a physical data model for a relational database, it is assumed that any class box without a stereotype is a table. 10, you see that views have dependencies on the table structures. 9: A logical data model. 10: A physical data model for a relational database.

As a result, I typically discard ORMs after I’m finished with them. I sometimes use ORMs to explore the domain with project stakeholders but later replace them with a more traditional artifact such as an LDM, a class diagram, or even a PDM. As a “generalizing specialist” (Ambler 2003b), someone with one or more specialties who also strives to gain general skills and knowledge, this is an easy decision for me to make; I know that this information that I’ve just “discarded” will be captured in another artifact — a model, the tests, or even the code — that I understand.

PK>> Physical Yes Indicates that a column is part of a primary key for a table. <> Physical No Indicates that a column is a surrogate key. 7). 11 you see that: ƒ The Order_ID column is the first element of the primary key. ƒ Order_Item_Sequence is the second element of the primary key. ƒ Order_ID is part of several keys: therefore, I needed to indicate additional information where appropriate. For example, Order_ID is the second element of the first alternate key. ƒ Because Order_Item_Sequence is part of a single key, I didn’t need to indicate the order.

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