[V4RB] Does order in constructor make difference?

Christer Olsson christer at ljusaideer.se
Sat Jan 24 19:03:34 CST 2004


>on 1/23/04 8:21 PM, Christer Olsson at christer at ljusaideer.se wrote:
>
>> I've spent the last five hours to hunt down a problem I've never seen before.
>> We're adding two new tables ("Rabatter" and "Rabattrader") to our main app,
>> and when we tried to add data to the new tables the app crashed every time on
>> the second table.
>> 
>> It turned out that both tables were created just fine (i.e we could see and
>> read them just fine with VAPP and ViSQL), but the baseObject for the second
>> table ("Rabattrader"/"boRabattrader") had no fields...
>> 
>> After lot's of spellchecking, renamning and recreating of properties, methods
>> and objects I just switched the order of the new tables in the database
>> constructor - and suddenly everything worked just fine.
>> 
>> So, this didn't work:
>> mInstallningar = new boInstallningar(self)
>> mKunder = new boKunder(self)
>> mArtiklar = new boArtiklar(self )
>> mOrder = new boOrder(self)
>> mOrderrader = new boOrderrader(self)
>> mRabatter = new boRabatter(self)
>> mRabattrader = new boRabattRader(self)
>> 
>> But this did:
>> mInstallningar = new boInstallningar(self)
>> mKunder = new boKunder(self)
>> mArtiklar = new boArtiklar(self )
>> mOrder = new boOrder(self)
>> mOrderrader = new boOrderrader(self)
>> mRabattrader = new boRabattRader(self)
>> mRabatter = new boRabatter(self)
>> 
>> Any ideas?
>
>Hi Christer, 
>
>Yes, order does mater. When you use classes.
>It does not mater, if you simply use Vdatabase and SQL.
>
>This is why it is danger go to VAPP, add few tables with many  fields,
>Then jump to RB and write code.
>
>Most probably in this case you will not get the same order.
>
>This is why you need create db/tables programmatically.

Both db and tables are created in code. And "Rabatter" is created before "Rabattrader".

As order matters, please tell what rules to follow, as I can't find anything regariding this in the docs.
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