[fdo-internals] primary key on views for rdbms providers?

[Bruno Scott]

I'm facing a problem in the PostGIS provider when mapping a view to a feature
class.
How to determine wich column will serves as primary key.
Is there a way in PostGIS to know wich one?

And on a more general perspective, what if there is more than one primary
key in the view's based tables? Is there a rule of thumb we could use?

How did you manage to resolve this question in providers like
Oracle,MySQL,SqlServer???

When there is no primary key on a feature class, the selection in mapguide
does not work!

Thanks
Bruno
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