Dealing with DB table-entries in ABAP OO

Question

Hi everybody,
in ABAP-Reports (normally) we have deal a lot with DB table entries.
Is there a "state of the art" for doing this with ABAP OO?
An easy example:
Asuming I want to select table  entries into an
internal table from BUT000.And than I want to write: the entries.
How would this look like in ABAP OO?
show the internal ZTable be my object?
or should every BUT000-Table-record be my object?
Regards Mario
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Message was edited by:
        Mario Müller

Answer 1

Hello Mario,
A very good question. This is what is called as modeling.
I shall give you an approach into this. There is no right and wrong way of doing it. Probably, only a more desriable or better way !!
How you model it depends on what your object is.
If you have an internal table of sales orders, still in real world the services or methods are on a single sales order. So the object here is a single sales order.
=> I would model the class to deal with one sales order. (this more or less answers your question)
2. Just to take this a little further.
What I would do is have 3 different layers of abstraction.
A UI class, a business layer class and a DB class.
UI class can only talk to business class, business can talk to DB class. And the DB class is a static class.
The UI class is only responsbile to do the display job.
The UI will display multiple sales orders for eg, so u have an internal table of instances to the business layer.
The business layer itself does validation, processing for each sales order.
The business layer can also have soem static methods (or class methods) to select multiple records from Database. This is static, as it is not acting on one sales order, but you are returning multiple. This method should simply call a method of the DB layer.
The DB layer is meant only to read from DB and write to DB.
Hope this helps. Remember to reward points, if it does.
For more highlights into this, refer to some material on design approach or design pattern.
Best Rgds,
Prashanth.
SAP.