Critique of Robert C. Martin's "Agile Principles, Patterns, and Practices"
in [OOP]
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From: Robert Martin on 30 Jan 2007 00:09 On 2007-01-27 11:05:57 -0600, frebe73(a)gmail.com said: > If the database isn't availible for developers, I suggest solving that > problem instead of changing the way you design software. Installing a > full database on a laptop has not been a problem for the last 10 years. > Eclipse uses more memory and CPU on my laptop than my SQL Server, > Oracle, Postgres and MySQL instances together. ;-) You haven't talked to some of the DBAs that I've talked to. Some won't allow the developers do TOUCH the database, let alone have a copy on their laptops. But actually, I agree with you. If I'm developing an application I want a copy of the database on my laptop because, as a developer, nothing should be outside of my control. Still, I want to be able to run tests without the database running. -- Robert C. Martin (Uncle Bob)��| email: unclebob(a)objectmentor.com Object Mentor Inc.� � � � � ��| blog:��www.butunclebob.com The Agile Transition Experts��| web:���www.objectmentor.com 800-338-6716� � � � � � � � ��|
From: Robert Martin on 30 Jan 2007 00:09 On 2007-01-27 11:05:57 -0600, frebe73(a)gmail.com said: > But horizontal layers doesn't help. If you shut down the database or > presentation layer, you don't have very much application to run anyway. Says who? Unless your application is nothing but CRUD, you've got some things to test. -- Robert C. Martin (Uncle Bob)��| email: unclebob(a)objectmentor.com Object Mentor Inc.� � � � � ��| blog:��www.butunclebob.com The Agile Transition Experts��| web:���www.objectmentor.com 800-338-6716� � � � � � � � ��|
From: Daniel Parker on 30 Jan 2007 00:10 On Jan 29, 10:46 pm, Robert Martin <uncle...(a)objectmentor.com> wrote: > >> "an object is a relation" ??? A relation in relational theory, > >> consisting of a set of tuples, is roughly analogous to the idea of a > >> table, consisting of a list of rows. > An object is an instance of a relation. Not sure what that means. A relation is a value. How can something be an instance of a value? If you're looking for metadata, that's in the relation's type. > The relation itself is described by the class of the object. > A relation, which is a value, has a type, which is its metadata and describes the structure of its tuples. Daniel
From: Robert Martin on 30 Jan 2007 00:12 On 2007-01-27 23:56:27 -0600, frebe73(a)gmail.com said: > Mocking out a database ain't trivial. Maybe it is of you only use the > database for persistence, but otherwise... *Simulating* a database is not trivial. Mocking it is. When you mock a database you aren't doing any of the functions that the database performs, you are simply returning canned data that is built into the mock. It's absolutely trivial. -- Robert C. Martin (Uncle Bob)��| email: unclebob(a)objectmentor.com Object Mentor Inc.� � � � � ��| blog:��www.butunclebob.com The Agile Transition Experts��| web:���www.objectmentor.com 800-338-6716� � � � � � � � ��|
From: Robert Martin on 30 Jan 2007 00:13
On 2007-01-27 23:56:27 -0600, frebe73(a)gmail.com said: > Installning, maintaining an running a RDBMS on every development > machine is not a problem. Correction: It's not a *technical* problem. -- Robert C. Martin (Uncle Bob)��| email: unclebob(a)objectmentor.com Object Mentor Inc.� � � � � ��| blog:��www.butunclebob.com The Agile Transition Experts��| web:���www.objectmentor.com 800-338-6716� � � � � � � � ��| |