On Saturday 27 January 2007 07:55, Paul McNett wrote:
> johnf wrote:
> > In Dabo I don't know how to sub-class
> > the BizObj and have access to my class within Dabo.
>
> "within Dabo": You wouldn't have access to your class from within Dabo,
> because it wouldn't be part of Dabo.
>
> To subclass dBizobj you just:
>
> #-- begin sample
> import dabo
>
> class MyBiz(dabo.biz.dBizobj):
> def initProperties(self):
> # set things like the the keyfield, table name, etc.
> def mySpecialFunction(self):
> # do stuff
> #-- end sample
>
> So then you save it somewhere within your application directory
> structure as MyBiz.py, and when you want to instantiate it you:
>
> #-- begin sample
> import dabo
> import MyBiz
> conn = dabo.db.dConnection(User="blah"...)
> biz = MyBiz.MyBiz(conn)
> #-- end sample
Perfect. That is what is happening in ClassDesigner when you add from the
data environment (QuickLayoutWizard is run) and it creates:
def createBizobjs(self):
class ArcustBizobj(dabo.biz.dBizobj):
def afterInit(self):
self.DataSource = "public.arcust"
#self.UserSQL="Select * from public.arcust where custno
like 'BRS'"
self.KeyField = "pkid"
self.addFrom("public.arcust")
self.addField("arcust.city")
self.addField("arcust.fax").....
arcustBizobj = ArcustBizobj(self.Connection)
self.addBizobj(arcustBizobj)
So now I have to figure out to call my special methods (in my BizObj) to
provide the special handling of postgres datatypes when doing an Update. Of
course I'm looking for a hint here because I'm really fuzzy as how to:
How to control the update statement that is needed. Do I sub-class
the "_sqlMgrCursor"? Would I provide my own "Form.new", "Form.save" which
would call my special BizObj methods? As you can see I again don't have an
idea of what I speak - but I'm learning very fast.
BTW speaking of learning I have realized that I'm learning by doing and not
reading. I don't believe I have done that in the past. What is surprising
is what I'm able to produce - my forms are working.
--
John Fabiani
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