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UI seperation from DB-access

Posted on 1998-10-13
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Last Modified: 2010-04-06
Hi,

We are at the start from a new project. For the maintenance of the system we decided that the coupling between the user interface and the database access should be as low as possible.
A database module written to access a certain kind of data like customer information should easy be transferable to another part of the application. How do you setup this, how do you get all your business logic in the database modules and how do you avoid database logic in forms!!

What tips can you guys give me on this topic?
What about OO in database modules?


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Question by:castelli
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4 Comments
 

Author Comment

by:castelli
ID: 1342744
Edited text of question
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dwwang earned 160 total points
ID: 1342745
You can just do any OO programming in data-modules, no problem.
For your question, below is an example(I usually use in our project):

type TMyDataModule=class(TDataModule)
public
function myBusinessfunc(...):retType;
end;

var
myDm:TMyDataModule;

impementation
function myBusinessfunc(...):retType;
begin
     //Access Database ....
end;

In other forms, just call myDM.myBusinessfunc;

That will enclose all your Data Logic in DM.

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Expert Comment

by:dwwang
ID: 1342746
Are you still there?
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Author Comment

by:castelli
ID: 1342747
Thanks , We were working out different scenario's, Sorry about the long waiting time...
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