<div dir="ltr">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.<br>
<br><div class="gmail_quote">On Tue, Aug 26, 2008 at 12:25 PM, Burgholzer,Robert <span dir="ltr"><<a href="mailto:rwburgholzer@deq.virginia.gov">rwburgholzer@deq.virginia.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">OK,</span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">So, what advantage is conferred by the use
of the geometry_columns table? </span></font></p><div class="Ih2E3d">
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
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<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Robert W. Burgholzer</span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Surface Water Modeler</span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Office of Water Supply and Planning</span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Virginia Department of Environmental
Quality</span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"><a href="mailto:rwburgholzer@deq.virginia.gov" target="_blank">rwburgholzer@deq.virginia.gov</a></span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">804-698-4405</span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Open Source Modeling Tools:</span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"><a href="http://sourceforge.net/projects/npsource/" target="_blank">http://sourceforge.net/projects/npsource/</a></span></font></p>
</div>
</div><div><div></div><div class="Wj3C7c"><p style="margin-left: 0.5in;"><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;">-----Original Message-----<br>
<b><span style="font-weight: bold;">From:</span></b> <a href="mailto:postgis-users-bounces@postgis.refractions.net" target="_blank">postgis-users-bounces@postgis.refractions.net</a>
[mailto:<a href="mailto:postgis-users-bounces@postgis.refractions.net" target="_blank">postgis-users-bounces@postgis.refractions.net</a>] <b><span style="font-weight: bold;">On Behalf Of </span></b>David William Bitner<br>
<b><span style="font-weight: bold;">Sent:</span></b> Tuesday, August 26, 2008
9:55 AM<br>
<b><span style="font-weight: bold;">To:</span></b> </span></font><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;">PostGIS Users
Discussion</span></font><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;"><br>
<b><span style="font-weight: bold;">Subject:</span></b> Re: [postgis-users]
schema name for a temp table?</span></font></p>
<p style="margin-left: 0.5in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;"> </span></font></p>
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<p style="margin-right: 0in; margin-bottom: 12pt; margin-left: 0.5in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">Nope,
you don't have to use addgeometrycolumn at all. You just need to create a
table with a column declared as geometry.<br>
<br>
Create table foo (my_geom_column geometry, my_id serial, my_attribute varchar);</span></font></p>
<div>
<p style="margin-left: 0.5in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">On Tue, Aug 26, 2008 at 8:20 AM, Burgholzer,Robert
<<a href="mailto:rwburgholzer@deq.virginia.gov" target="_blank">rwburgholzer@deq.virginia.gov</a>>
wrote:</span></font></p>
<p style="margin-left: 0.5in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">Kevin,<br>
Thanks for the response. By spatially enabled, I mean, has a geometry<br>
column, and I wish to use that column for comparison operators, such as<br>
st_within(). Furthermore, since I am adding the column to a table of<br>
data, then setting the geom column to table lat/lon values, I needed to<br>
use addgeometrycolumn (at least I think that I need to do that).<br>
<br>
Anyhow, your query gives me just the information that I need. Thanks!</span></font></p>
<div>
<p style="margin-right: 0in; margin-bottom: 12pt; margin-left: 0.5in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;"><br>
r.b.<br>
<br>
Robert W. Burgholzer<br>
Surface Water Modeler<br>
Office of Water Supply and Planning<br>
Virginia Department of Environmental Quality<br>
<a href="mailto:rwburgholzer@deq.virginia.gov" target="_blank">rwburgholzer@deq.virginia.gov</a><br>
804-698-4405<br>
Open Source Modeling Tools:<br>
<a href="http://sourceforge.net/projects/npsource/" target="_blank">http://sourceforge.net/projects/npsource/</a></span></font></p>
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<p style="margin-left: 0.5in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">-----Original Message-----<br>
From: <a href="mailto:postgis-users-bounces@postgis.refractions.net" target="_blank">postgis-users-bounces@postgis.refractions.net</a><br>
[mailto:<a href="mailto:postgis-users-bounces@postgis.refractions.net" target="_blank">postgis-users-bounces@postgis.refractions.net</a>]
On Behalf Of<br>
Kevin Neufeld<br>
Sent: Monday, August 25, 2008 5:51 PM<br>
To: PostGIS Users Discussion<br>
Subject: Re: [postgis-users] schema name for a temp table?<br>
<br>
SELECT nspname FROM pg_namespace WHERE oid = pg_my_temp_schema();<br>
<br>
But what exactly do you mean by "spatially enabled"? Any table
with a<br>
geometry column is "spatially enabled". It may not be
registered with<br>
the geometry_columns metadata table or have spatial constraints on it,<br>
but it is capable of holding spatial data.<br>
<br>
ie.<br>
CREATE TEMP TABLE test (id integer, the_geom geometry);<br>
\d<br>
Table "pg_temp_11.test"<br>
Column | Type | Modifiers<br>
----------+----------+-----------<br>
id | integer |<br>
the_geom | geometry |<br>
<br>
Cheers,<br>
Kevin<br>
<br>
<br>
Burgholzer,Robert wrote:<br>
> I have a temporary table that I would like to spatially enable.
Thus,<br>
I<br>
> need to know the proper schema name, assuming that the schema name<br>
would<br>
> change if there were multiple temp tables with the same name (a<br>
> possibility if several users are hitting the app simultaneously).<br>
><br>
><br>
><br>
> Has anyone had any experience with this?<br>
><br>
><br>
><br>
> Thanks!<br>
><br>
> r/b/<br>
><br>
><br>
><br>
> Robert W. Burgholzer<br>
><br>
> Surface Water Modeler<br>
><br>
> Office of Water Supply and Planning<br>
><br>
> Virginia Department of Environmental Quality<br>
><br>
> <a href="mailto:rwburgholzer@deq.virginia.gov" target="_blank">rwburgholzer@deq.virginia.gov</a><br>
><br>
> 804-698-4405<br>
><br>
> Open Source Modeling Tools:<br>
><br>
> <a href="http://sourceforge.net/projects/npsource/" target="_blank">http://sourceforge.net/projects/npsource/</a><br>
><br>
><br>
><br>
><br>
><br>
><br>
><br>
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><br>
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<p style="margin-left: 0.5in;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;"><br>
<br clear="all">
<br>
-- <br>
************************************<br>
David William Bitner</span></font></p>
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</blockquote></div><br><br clear="all"><br>-- <br>************************************<br>David William Bitner<br>
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