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The controller and view can both be considered as part of the presentation layer,
while the model could be considered as a fusion between the business logic and
data-access layers.
Chapter 4
[ 69 ]
There is a similar pattern to the MVC called 3-tier architecture. It
is important that we do not confuse the two. 3-tier architecture is
more concerned with the data layer; the MVC focuses more on the
presentation layer. It is quite likely that we will find ourselves using a
combination of the two. For more information about 3-tier architecture,
refer to
http://en.wikipedia.org/wiki/Multitier_architecture.
Each part of the MVC is represented in Joomla! by an abstract class: JModel, JView,
and JController. These classes are located in the joomla.applictaion.component
library. This diagram shows how the classes relate to one another:
The model is used to handle data. In most cases, the data will be sourced from the
database; however, we can use any data source. A single model is designed to work
with multiple records; in other words a model does not represent a single record.


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