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BIZ Class Design
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À
09/03/2011 22:30:51
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Versions des environnements
Visual FoxPro:
VFP 9 SP1
Divers
Thread ID:
01503016
Message ID:
01503156
Vues:
47
>>>So far I have been creating one BIZ object for one table. But I am wondering if there is a better design for cases of parent/child tables and ancillary tables. For example, P.O. Header table and P.O. Item table. One approach I am considering is to instantiate P.O. items BIZ object in the INIT of the P.O. Header BIZ object. And then "deal" with any updates for P.O. Items within P.O. Header BiZ object. How do you design your BIZ objects for the cases of parent/child tables?
>>>
>>>Right now, I am tinkering with the DataEnvironment (DE) as my BIZ Object, then use CursorAdapters (CA) as 'representations' of each table. Since the DE is a container, it would be easy to handle its CA members.
>>>
>>>Just my two cents. =)
>>>
>>Very interesting approach. I will think about it. Thank you.
>
>The problem with that approach is that ONLY the DE can have child objects. Similar to your approach I have child objects where necessary, but not all children are data children - sometimes they are added to provide biz functionality. Data children have a CA associated in a property, as custom cannot addobject them. But this way modelling becomes easier for my way of thinking
>
>regards
>
>thomas.

Thank you for your input, Thomas.
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham
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