RE: [postgis-users] An I/O error occured while sending to the backend

[Stefan Zweig]

hi mark

my select postgis_full_version() is:

"POSTGIS="1.2.1" GEOS="2.2.3-CAPI-1.1.1" PROJ="Rel. 4.4.9, 29 Oct 2004" USE_STATS"

The geometry is supposed to be a multipolygon, but in fact it isn't (see attached coordinate file). first part of the multipolygon is in fact a polygon, but then there are following parts with only one single point. I have loaded this geometry, using shp2pgsql. maybe the loader should consider that, but actually postgis should not crash either. it could be, that the original shapefile was malformed (not ESRI shape conform).

regards,

stefan



> -----Ursprüngliche Nachricht-----
> Von: PostGIS Users Discussion <postgis-users at postgis.refractions.net>
> Gesendet: 17.08.07 00:32:33
> An: PostGIS Users Discussion <postgis-users at postgis.refractions.net>
> Betreff: RE: [postgis-users] An I/O error occured while sending to the backend


> 
> On Thu, 2007-08-16 at 12:03 +0200, Stefan Zweig wrote:
> > hi mark,
> > 
> > thanks for your advice. it was a good idea to test whether only some of the geometrys cause the error. that is in fact the case. i have found out that some of the multipolygons of the the_geom are corrupt, so they are not really multipolygon.
> > 
> > is it possbile to catch this exception (p)sql-side within the query instead of crashing the whole database connection.
> > 
> > btw.: my postgis_version(): 1.2.1
> > my posgre: 8.1.4
> > 
> > kind regards, 
> > 
> > stefan
> 
> 
> Hi stefan,
> 
> What do you mean by corrupt? Is there invalid binary data in the
> geometry field or is a just a geometry that causes a crash when run as
> part of that query?
> 
> In the latter case, the important factor will be the version of GEOS you
> are using - what does "SELECT postgis_full_version()" show? If you using
> anything < 2.2.3 then upgrade and try again; if you are using 2.2.3 or
> 3.0.0rc4 and crash still happens, please post the offending geometry to
> the list.
> 
> 
> ATB,
> 
> Mark.
> 
> -- 
> ILande - Open Source Consultancy
> http://www.ilande.co.uk
> 
> 
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> 


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