Lori,
The reason that some people discourage the use of a query object as a return
type is due to the fact that it binds whatever uses that query object
directly to the database (more specifically, to the columns in the
database).

The use of setter/getter beans should be familiar to your boss; under the
java design pattern "Transfer Object", and are used as a mechanism to
transfer the data in an encapsulated fashion.  Return types are used in CFCs
to create a strongly typed system.  There are many debates on strong typing
variables within CF (see duck typing), so you will have decide what best
fits your team and development style.

"Gateway objects" refer to a design pattern that has grown within the CF
community, and refers to an object that manages all aggregate database
interaction, while a DAO (data access object) manages persisting a single
object.

Many of the problems that come up in traditional java OO application
development apply directly to CF and many can be solved using the same
solutions and design patterns.  Conversly, there are also new prolbems that
are introduced using CF that must be solved in much different ways.  A
concrete example would be in java it is typical to create large object
graphs (nested sets of objects), where in CF you must limit the depth of the
graph as there are high object instantiation costs.

Good luck!

Rich Kroll


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