Delphi DataModule Usage - Single or Multiple?

Question

I am writing an application, there are various forms and their corresponding datamodules.
I wrote in a way that they are using each other by mentioning in uses class(one in implementation and another in interface to avoid cross reference) Is this approach is wrong? why or why not i should use in this way?

Answer 1

I have to agree with Ldsandon, IMHO it's way better to have more than one datamodule in your project. If you look at it as a Model - View - Controller thingie, your DB is the model, your forms would be the Views and your datamodules would be the controllers.

Personally I always have AT LEAST 2 datamodules in my project. One datamodule is used to share Actions, ImageLists, DBConnection, ... and other stuff throughout the project. Most of the time this is my main datamodule.

From there on I create a new datamodule for each 'Entity' in my application. For example If my application needs to proces or display orders, cursomters and products, then I will have a Datamodule for each and everyone of those.

This way I can clearly separate functionality and easily reuse bits and pieces without having to pull in everything. If I need something related to Customers, I simple use the Customers Datamodule and just that.

Regards,

Stefaan