Interoperability and standards. The geometry_columns table provides metadata that is required for standards compliance and used by many client programs. Internally, it does nothing. The other thing that AddGeometryColumn() does that is valuable is to create constraints on the geometry column to make sure that all records are of the same geometry type and in the same srid.
On Tue, Aug 26, 2008 at 12:25 PM, Burgholzer,Robert < [EMAIL PROTECTED]> wrote: > OK, > > So, what advantage is conferred by the use of the geometry_columns table? > > > > Robert W. Burgholzer > > Surface Water Modeler > > Office of Water Supply and Planning > > Virginia Department of Environmental Quality > > [EMAIL PROTECTED] > > 804-698-4405 > > Open Source Modeling Tools: > > http://sourceforge.net/projects/npsource/ > > -----Original Message----- > *From:* [EMAIL PROTECTED] [mailto: > [EMAIL PROTECTED] *On Behalf Of *David > William Bitner > *Sent:* Tuesday, August 26, 2008 9:55 AM > *To:* PostGIS Users Discussion > *Subject:* Re: [postgis-users] schema name for a temp table? > > > > Nope, you don't have to use addgeometrycolumn at all. You just need to > create a table with a column declared as geometry. > > Create table foo (my_geom_column geometry, my_id serial, my_attribute > varchar); > > On Tue, Aug 26, 2008 at 8:20 AM, Burgholzer,Robert < > [EMAIL PROTECTED]> wrote: > > Kevin, > Thanks for the response. By spatially enabled, I mean, has a geometry > column, and I wish to use that column for comparison operators, such as > st_within(). Furthermore, since I am adding the column to a table of > data, then setting the geom column to table lat/lon values, I needed to > use addgeometrycolumn (at least I think that I need to do that). > > Anyhow, your query gives me just the information that I need. Thanks! > > > r.b. > > Robert W. Burgholzer > Surface Water Modeler > Office of Water Supply and Planning > Virginia Department of Environmental Quality > [EMAIL PROTECTED] > 804-698-4405 > Open Source Modeling Tools: > http://sourceforge.net/projects/npsource/ > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Kevin Neufeld > Sent: Monday, August 25, 2008 5:51 PM > To: PostGIS Users Discussion > Subject: Re: [postgis-users] schema name for a temp table? > > SELECT nspname FROM pg_namespace WHERE oid = pg_my_temp_schema(); > > But what exactly do you mean by "spatially enabled"? Any table with a > geometry column is "spatially enabled". It may not be registered with > the geometry_columns metadata table or have spatial constraints on it, > but it is capable of holding spatial data. > > ie. > CREATE TEMP TABLE test (id integer, the_geom geometry); > \d > Table "pg_temp_11.test" > Column | Type | Modifiers > ----------+----------+----------- > id | integer | > the_geom | geometry | > > Cheers, > Kevin > > > Burgholzer,Robert wrote: > > I have a temporary table that I would like to spatially enable. Thus, > I > > need to know the proper schema name, assuming that the schema name > would > > change if there were multiple temp tables with the same name (a > > possibility if several users are hitting the app simultaneously). > > > > > > > > Has anyone had any experience with this? > > > > > > > > Thanks! > > > > r/b/ > > > > > > > > Robert W. Burgholzer > > > > Surface Water Modeler > > > > Office of Water Supply and Planning > > > > Virginia Department of Environmental Quality > > > > [EMAIL PROTECTED] > > > > 804-698-4405 > > > > Open Source Modeling Tools: > > > > http://sourceforge.net/projects/npsource/ > > > > > > > > > > > > > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > postgis-users mailing list > > postgis-users@postgis.refractions.net > > http://postgis.refractions.net/mailman/listinfo/postgis-users > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > > > > > -- > ************************************ > David William Bitner > -- ************************************ David William Bitner
_______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
