[mapguide-users] MapGuide Selection and UniqueID Determination

[Crispin at 1Spatial]

Thanks Kenneth,

That helps if we have the definition of an "identity column".  ie how does
FDO determine this?  I assume (hope) it is not just having a FDO
"IsAutogenerated()" value as obviously a database could have a unique column
that is key but not from a sequence.

SHP and SDF generically get a "FeatId" autogenerated through the provider
but this is not the case for foreign database schemas.



Kenneth, GEOGRAF A/S wrote:
> 
> To be able to select items the layer must be selectable (set in the 
> MapDefinition).
> Secondly, the FeatureSource must have at least one identity column.
> If not, all features on the layer are selected.
> 
> Regards, Kenneth Skovhede, GEOGRAF A/S
> 
> 
> 
> Crispin @ 1Spatial skrev:
>> Hi,
>>
>> Can someone explain how the magic of MapGuide selection works...
>>
>> Of particular interest to me is a particular ArcSDE dataset that appears
>> fine in MapGuide but (despite correct settings in Studio) has a class of
>> points which when mapped as a layer do not 'select' in the map.
>>
>> Using a seperate direct FDO connection I can see the class has no
>> columns/proprttydefinitions that are "IsAutogenerated()" - is this a
>> requirement for a layer to be selectable or is there another criteria?
>>
>> Tooltips appear OK.
>>
>>  Crispin
>>
>>   
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> 

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