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From: Nananana on 26 Sep 2005 05:07
Hi.
I have a class diagram of Entity classes.
How can I create an ERD?
TIA

From: H. S. Lahman on 26 Sep 2005 12:20
Responding to Nananana...

> I have a class diagram of Entity classes.
> How can I create an ERD?

Assuming these are Entity classes in the Jacobson sense and the Class
Diagram is well-formed:

(1) strip off any Operations (there shouldn't be a lot besides
getters/setters)
(2) strip off any Interfaces (the "lollipop" element in UML).
(3) provide identity and referential attributes as needed for the
relationships.
(4) convert any exotic relationships (dependency, composition, etc.) to
simple bi-directional associations.

Note that (1) may result in collapsing subclassing trees to a single
Entity (i.e., there may no longer be a basis for distinguishing subclasses).

Now for a push back: why do you want an ERD if you have a Class Diagram?
If it is simply to map your objects into persistence the conversion is
likely to be more complicated. That is, you want to create and ERD
directly from an optimal RDB schema rather than trying to convert a
Class Diagram for a specific problem solution.

*************
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H. S. Lahman
hsl(a)pathfindermda.com
Pathfinder Solutions -- Put MDA to Work
http://www.pathfindermda.com
blog: http://pathfinderpeople.blogs.com/hslahman
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From: Nananana on 26 Sep 2005 16:38
Thanks.

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