[Chameleon] Re: MapServer dies when trying to view a
layer generated with PostGIS
Jeff McKenna
jmckenna at dmsolutions.ca
Thu Nov 24 13:56:45 EST 2005
this reply was posted on the PostGIS list...
Nicolas Ribot wrote:
> Hello Carlo,
>
> New version of Postgresql (8.1) does not create OID column by default
> when creating a table (oid is globally unique identifiers used by
> Postgresql and also used by Mapserver to uniquely identify a row of
> result).
>
> My solution was to enable oid-generation in postgresql, by editing the
> postgresql.conf (in the postgresql/8.1/data folder)
> Search for "default_with_oids", uncomment the line and set the
> variable value to "on".
> Then, regenerate your postgis tables.
>
> I'm pretty sur you could also modify existing tables to add the oid
> column, though I don't know if it will work.
>
> With the method above, newly created tables will have the shadow OID
> column added.
>
> HTH.
> Nicolas
>
> On 11/24/05, Carlo Trönnberg <carlo.t at chello.hu> wrote:
>
>>
>>Dear list,
>>
>>I have troubles to get PostGIS to work with MapServer.
>>I went through the PostGIS tutorial, using the sampe data. PostGIS works
>>great on the command line.
>>But then I tried to call PostGIS with the MapServer as described in the
>>tutorial adding the following layer to the map file of some working sample
>>maps of nboth GMap and Chameleon:
>>
>>LAYER
>> NAME "elections"
>> CONNECTIONTYPE postgis
>> CONNECTION "host=localhost port=5432 dbname=bc password=[ I won't tell
>>you! :-) ] user=postgres"
>> DATA "the_geom from bc_voting_areas"
>> TYPE POLYGON
>> STATUS OFF
>> PROJECTION
>> "proj=aea"
>> "ellps=GRS80"
>> "lon_0=-126"
>> "lat_0=45"
>> "lat_1=50"
>> "lat_2=58.5"
>> "x_0=1000000"
>> END
>> CLASS
>> NAME "Voting Areas"
>> OUTLINECOLOR 0 0 0
>> COLOR 255 255 200
>> END
>>END
>>
>>
>>If the layer is disabled (STATUS OFF) then everything is OK. BUT if i enable
>>it, MapServer cannot render the map (image missing symbol in the browser). I
>>switched on the Apache error logging to see what happens. Here is an extract
>>of the error log. A column oid seems to be missing... But that does not make
>>me smarter. I got similar error logs with both GMap and Chameleon.
>>
>>[Thu Nov 24 17:32:11 2005] [error] [client 127.0.0.1] PHP Warning:
>>[MapServer Error]: msDrawMap(): Failed to draw layer named 'elections'.,
>>referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:11 2005] [error] [client 127.0.0.1] in
>>C:\\ms4w\\apps\\chameleon\\htdocs\\common\\wrapper\\drawmap.php
>>on line 533, referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:11 2005] [error] [client 127.0.0.1] PHP Warning:
>>[MapServer Error]: prep_DB(): Error executing POSTGIS DECLARE (the actual
>>query) statement: 'DECLARE mycursor BINARY CURSOR FOR SELECT
>>asbinary(force_collection(force_2d(the_geom)),'NDR'),OID::text
>>from bc_voting_areas WHERE the_geom && setSRID('BOX3D(-1077436.43349587
>>-810519.362607715,6569519.15906088 5920600.07354032)'::BOX3D,
>>find_srid('','bc_voting_areas','the_geom') )' <br><br>,
>>referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:11 2005] [error] [client 127.0.0.1] , referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:11 2005] [error] [client 127.0.0.1] Postgresql reports the
>>error as 'ERROR: column "oid" does not exist, referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:11 2005] [error] [client 127.0.0.1] '<br><br>, referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:11 2005] [error] [client 127.0.0.1] , referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:11 2005] [error] [client 127.0.0.1] More Help:<br><br>,
>>referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] , referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] Error with POSTGIS
>>data variable. You specified '<check your .map file>'.<br>, referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] Standard ways of
>>specifiying are : <br>, referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] (1) 'geometry_column
>>from geometry_table' <br>, referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] (2) 'geometry_column
>>from (<sub query>) as foo using unique <column name> using
>>SRID=<srid#>' <br><br>, referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] , referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] Make sure you put in
>>the 'using unique <column name>' and 'using SRID=#' clauses in.,
>>referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] , referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] <br><br>For more help,
>>please see http://postgis.refractions.net/documentation.php
>>, referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] , referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] <br><br>Mappostgis.c -
>>version of Jan 23/2004., referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] , referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] in
>>C:\\ms4w\\apps\\chameleon\\htdocs\\common\\wrapper\\drawmap.php
>>on line 533, referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>[Thu Nov 24 17:32:12 2005] [error] [client 127.0.0.1] PHP Warning: Cannot
>>modify header information - headers already sent by (output started at
>>C:\\ms4w\\apps\\chameleon\\htdocs\\common\\wrapper\\drawmap.php:533)
>>in
>>C:\\ms4w\\apps\\chameleon\\htdocs\\common\\wrapper\\drawmap.php
>>on line 1476, referer:
>>http://localhost/chameleon/samples/sample_enhanced.phtml
>>
>>I am quite deseperate: I tried different versions of MS4W (1.0.3 and 1.2.2)
>>but that did not change the situation.
>>I am using PostgreSQL 8.1 with the PostGIS included with it under Windows XP
>>Pro SP2.
>>Trying step by step different PostGIS tutorials I get the same error.
>>I have tried this on 2 different computers and get the same errors.
>>
>>What can be the problem? As opposed to what I have read in the forum, in my
>>situation ALL layers die when I try to get a layer via PostGIS.
>>I previously used MySQL via ODBC but that gave me trouble as well (I could
>>not query the database, just dump a complete column). This is why I decided
>>to convert to PostGIS (which is MUCH better anyway for my task).
>>
>>Thanks for your help and your time.
>>
>>Cheers,
>>
>>Carlo Trönnberg
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