[Gambas-user] handling database nulls

[nando]

What about testing if it's null first as in...

IF IsNull(dbresult!rangeheight) THEN
  'it's null here, you might want to do something like
   dp.rangeheight=0
ELSE
   dp.rangeheight=$dbresult!rangeheight

ENDIF


---------- Original Message -----------
From: Bruce <bbruen at ...2090...>
To: gambas-user at lists.sourceforge.net
Sent: Wed, 15 Apr 2009 17:27:38 +1000
Subject: [Gambas-user] handling database nulls

> This has sort of been asked before. However, the answers I have found haven't 
> helped.
> 
> My database has a LOT of integer fields, arranged into sets of fieldwork 
> results.  The majority of them contain nulls, quite validly as the data for a 
> particular set may not have been entered or even collected yet.
> 
> My Gambas problem is creating the classes for the various plot types.  Within 
> Gambas the data items are integers. When I try and read the existing datum 
> point into the class (as in dp.rangeheight=$dbresult!rangeheight ) it is 
> complaining that the value is a null not an integer, as in "wanted integer, 
> got null instead").
> 
> Now, coercing the value of the object data to zero is NOT valid, as in the 
> above example, the rangeheight is null not zero, as zero means 0m above the 
> basepoint.  Similarly, coercing it to a negative value wont work either, as 
> that means meters below the base point.
> 
> Is there any way to set the value of an integer variable to an "uninitalised" 
> state?
> 
> bruce
> 
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------- End of Original Message -------