[mapguide-internals] MapTips fail when properties have nullvalues?

[Traian Stanev]

Oh I meant that one way I can think of to work around this right now is
to replace the values in the data source by empty string. I know that's
not the right thing to do.

The right thing to do is to call IsNull() somewhere in
RSMgFeatureReader::GetAsString(), which is used to convert property
values to strings for tooltips and selection.


Traian


-----Original Message-----
From: mapguide-internals-bounces at lists.osgeo.org
[mailto:mapguide-internals-bounces at lists.osgeo.org] On Behalf Of Paul
Spencer (External)
Sent: Wednesday, February 21, 2007 8:49 AM
To: MapGuide Internals Mail List
Subject: Re: [mapguide-internals] MapTips fail when properties have
nullvalues?

Traian, do you mean that the NULLs should be replaced by empty  
strings in the data source (not always feasible/desirable, esp if the  
data drives other apps that accomodate the NULL correctly)? or is  
there some way to do that in an expression?

Paul

On 20-Feb-07, at 2:39 PM, Traian Stanev wrote:

> I would say it's a bug in the expression evaluation code. Using empty
> string would likely work around the problem.
>
> Traian
>
>
> -----Original Message-----
> From: mapguide-internals-bounces at lists.osgeo.org
> [mailto:mapguide-internals-bounces at lists.osgeo.org] On Behalf Of Jason
> Birch
> Sent: Tuesday, February 20, 2007 11:09 AM
> To: MapGuide Internals Mail List
> Subject: RE: [mapguide-internals] MapTips fail when properties have
> nullvalues?
>
> I can't say that I have much insight into why this is happening.
>
> This does mirror expected functionality in most DBMS systems, so it's
> not necessarily a bad thing, but these systems also provide  
> functions to
> work around the null values, such as NVL, ISNULL, etc...
>
> Jason
>
> -----Original Message-----
> From: mapguide-internals-bounces at lists.osgeo.org
> [mailto:mapguide-internals-bounces at lists.osgeo.org] On Behalf Of Paul
> Spencer
> Sent: Tuesday, February 20, 2007 05:59
> To: MapGuide Internals Mail List
> Subject: [mapguide-internals] MapTips fail when properties have null
> values?
>
> Hi all ... I filed this as an issue in Trac but I haven't seen any
> comments on it :) Maptips fail to appear when the expression  
> references
> a property that is null for the current feature. Another feature that
> does not have null values in the properties will produce a map tip.
>
> Is this behaviour by design or a potential bug? Is there a way to work
> around null values in the data by replacing them with an empty string?
>
>
> Trac ticket is:
>
> http://mapguide.osgeo.org/trac/mapguide/ticket/3
>
> I'm not looking for resolution, just a quick answer on whether this is
> by design, a potential bug, or a configuration problem.
>
> Cheers
>
> Paul
>
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> |Paul Spencer                          pspencer at dmsolutions.ca    |
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> |Chief Technology Officer                                         |
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+-----------------------------------------------------------------+
|Paul Spencer                          pspencer at dmsolutions.ca    |
+-----------------------------------------------------------------+
|Chief Technology Officer                                         |
|DM Solutions Group Inc                http://www.dmsolutions.ca/ |
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