>>>I am thinking about how to create business objects (to paraphrase William Hunt, “I don’t have a formal computer training” <g>) and would like to know if I am on the right track.
>>>
>>>The following is a very simplified example.
>>>
>>>Say, I want to create a business object for conference room reservation program. One business object I will need is Reservation Class/Object.
>>>
>>>I think I will need to create a class (in VFP, based on a form class so that it would have private data session) with custom properties such as:
>>>Room No
>>>Reservation Date
>>>Time From
>>>Tim To
>>>Reserved For
>>>Etc.
>>>
>>>The class would also have methods, such as:
>>>Check if room already booked
>>>Save reservation.
>>>
>>>Here how the business object will be used:
>>>1. User enters information into a data entry form.
>>>2. Data entry form creates an object of the Reservation Class.
>>>3. Reservation Class object properties are then set with values from data entry form controls.
>>>4. Reservation Class method “Check if room already booked” is called.
>>>5. Reservation Class method “Save reservation” is called.
>>>
>>>Would the above description be “in line” with how to create business objects with VFP?
>>>
>>>Thank you for any comments. Also, if someone wants to recommend a basic/beginners book or a white paper on creating business objects, I would appreciate very much.
>>
>>Dmitry,
>>
>>Let me add to what Craig told you.
>>
>>It appears that you're using the form class in order to have access to the dataenvironment and private datasession. However, in a typical n-tier design, is something like this:

UI < -- > BO < -- > Data

The double headed arrows show the communication path.
>>
>>You can achieve a private datasession via the session class, and, in VFP 8.0 have the ability to sub-class a dataenvironment independently of a form.
>
>George,
>I understand what you are saying. Since I am making just baby steps in n-rier application I thought, at this phase, I would combine BO and DATA in one tier. Basically, I want to keep all code in the same place rather than all over the UI methods. And since I still work with VFP 6 (even though I have VFP 8) I didn't know of the private datasession independent of the form feature.
>
>Thank you very much for your help.

Dmitry,

You're welcome. The session object was introduced in VFP 6.0 SP3, I believe, so you at least should have access to that.

Good Luck,