VB App & UML Use Case

[iwaters]

I am creating a web based application using ASP. I am writing the Data Layer and Buisness Layer in visual basic. I am trying to plan the classes using a UML Class Diagram. I am having real trouble though. Most of the functions the business layer will perform are simple read/writes to the database, there are hardly any associations/generalizations that I can see on the class diagram. Is this normal to have a set of objects that only exist on their own? If so do I just define the attributes and operations for each class and place them on the diagram without any associtations etc?
Also how do I determine the classes, should I have a class for each functional area? For example I need to track jobs that engineers are working on and what equipment they have used. Do I have one class that handles the job functionality and one for the equipment?
Any thoughts

 

[Ladyhawk]

Another way to view it is to put the read/writes into the data layer. This way your business layer doesn't have to know anything about how the data is read or written.

Ladyhawk.
** ASP/VB/Java Programmer **