I occasionally get some stick for being a dinosaur, so I decided my next

app would be properly oop.

I have trouble deciding the build order of the layers (based on what an

object could/should know about other objects, and in particular how to map

n-tier design onto the vfp world view.

So I resorted to the web - only to find (again) that there seems to be no

consensus on what *practically* to do, all discussions seem to degenerate

into angels-on-a-pin abstract navel gazing.

Several bods (some eminent) having a tired heresy-fest here:

http://fox.wikis.com/wc.dll?Wiki~FourTierArchitecture~softwareEng

Who can fit the pegs into the holes?

Holes:

UI layer

Businees [Rules] layer

Data Management layer

Data Layer

Pegs (for this game):

main.prg

oApp / App Class

Class Libs

Proc/ Fn libs

Bizobj(s)

DataObj(s)

Cursors

CursorAdapters

Data Environment

Datasession(s)

Top Level Forms

Forms

Controls

rdbms

tables

relations, constraints, SP's

The_Programmer

Use your skill and experience to build an understandable, functional,

maintainable design using some or all of the objects provided !!!

The addition of themes, alpha transparency, voice recognition/ response,

email, braille and AI is left as an exercise for the more seriously

deranged reader <s>.

Andrew Davies  MBCS CITP

  - AndyD        8-)#

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