Re: [Geotools-devel] OGC Features ID

[Chris H. <ch...@op...>]

Quoting st...@re...:

> [ intentionally moved to geotool-devel only as for Jody proposal ]
> [ postgis-devel included for obvious reasons ]
>
> On Fri, Mar 25, 2005 at 03:24:49AM -0500, Chris Holmes wrote:
> > FID stuff is super annoying, since all they say is that you have to
> have
> > one, it has to be unique, and has to be persistant.  Different
> > implementors do different things.  Leveraging primary keys when
> > available to me is the most sensible solution.  But basically we
> try to
> > deal with whatever the user may have set up in reasonable default
> ways,
> > and then allow users control as much as possible in setting it up
> other
> > ways.  The oid used to work great as the fid, since it was hidden
> for
> > the most part.  Put Paul said it was going away in the future or
> > something.
>
> Oid is not a mandatory field:
>
> 	CREATE TABLE test (id serial) WITHOUT OIDS;
>
> In the future of postgresql the WITHOUT OIDS will be the default,
> and users will have to explicitly request oids:
>
> 	CREATE TABLE test (id serial) WITH OIDS:
>
> My suggestion is to consider *this* issue in the postgis side.
> PostGIS has broader then OGC required feature, but OGC things
> are done using OGC-specified function. One of this is
> AddGeometryColumn(), which makes a table an OGC features table.
>
> This function *might* ensure there's a primary key defined
> for the table, being it either oid or 'gid' or whatever, and
> eventually store this information in the geometry_columns
> table. This would be yet another untracked dependency to be
> aware of, which means users will easily break it, but could
> be worth the effort.
Storing in the geometry_columns table would be great.  GeoTools would be
able to just look it up.  Indeed it would be nice to also have it say
whether the fid attributes should show up as attributes or not.  This
could allow users to exactly customize their fids as they like (though
should check that the columns are always unique).

Chris

>
> --strk;
>
>
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