[postgis-users] Still cannot display postgis layers using ms4w

Wed Aug 6 01:10:32 PDT 2008

Just a guess.  Get rid of your FILTER clause or actually put a where
condition in your FILTER clause.  I think the fact that your FILTER clause
is empty is causing PostgreSQL to generate an invalid query that looks
something like this

SELECT *
FROM sometable
WHERE 

Can't have  where without a where condition.

Hope that helps,
Regina

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
kreshna_iceheart at yahoo.com
Sent: Wednesday, August 06, 2008 3:17 AM
To: postgis-users at postgis.refractions.net
Subject: [postgis-users] Still cannot display postgis layers using ms4w

Help. Somebody please help. Anybody. :-(

I am using postgreSQL 8.2.5 for Windows with postGIS. The database was
installed using Windows .msi installation package. I am also using ms4w
2.2.7 that comes with MapServer 5.0.2. All installed on Windows XP Service
Pack 2.

The MapServer does support postGIS. When I executed mapserv -v, I got the
following:
MapServer version 5.0.2 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP
OUTPUT=PDF OUTPUT=SWF OUTPUT=SVG SUPPORTS=PROJ SUPPORTS=AGG
SUPPORTS=FREETYPE SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT
SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER
SUPPORTS=SOS_SERVER SUPPORTS=FASTCGI SUPPORTS=THREADS SUPPORTS=GEOS
INPUT=JPEG INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE

In the postgreSQL database, I have created a database named test_mapserv. I
also created a schema named rencana, and a table named kawasanbencana. The
name of the geometry column is the_geom.
 I have created a spatial index (kawasanbencanaspix) on the geometry column.
I also use lowercase to write the 'from' statement.

The problem is: MapServer always gives the "..Query error. Error executing
POSTGIS DECLARE.." error message, no matter what I do. And I have tried
everything ad nauseam.

I have tried specifying the DATA line without USING UNIQUE ... USING SRID
line. I have tried specifying the DATA line with USING UNIQUE ...USING SRID.
I have tried using double apostrophe (") and single apostrophe ('). It
doesn't matter. Everything I have tried has failed, and I still get the
error message no matter what I did. 

My mapfiles are attached in this mail. Each reflect my futile attempt, and
all of them generated the error message.

My first attempt:
=================

This is my first attempt. I have both the mapfile and the error message
attached on this mail.
    CONNECTIONTYPE postgis
    CONNECTION 'host=localhost user=rtrw password=123456 port=5432
dbname=test_mapserver'
    DATA 'the_geom from rencana.kawasanbencana'

And I got the following error message:
msDrawMap(): Image handling error. Failed to draw layer named
'kawasanbencana'. prepare_database(): Query error. Error executing POSTGIS
DECLARE (the actual query) statement: 'DECLARE mycursor BINARY CURSOR FOR
SELECT asbinary(force_collection(force_2d(the_geom)),'NDR'),gid::text from
rencana.kawasanbencana WHERE () and (the_geom && setSRID(
'BOX3D(528635.525378392 9074209,609092.162121608
9134520)'::BOX3D,find_srid('','rencana.kawasanbencana','the_geom') ))'
Postgresql reports the error as 'ERROR: syntax error at or near ")" LINE 1:
...DR'),gid::text from rencana.kawasanbencana WHERE () and (the... ^ ' More
Help: Error with POSTGIS data variable. You specified 'check your .map
file'. Standard ways of specifiying are : (1) 'geometry_column from
geometry_table' (2) 'geometry_column from (sub query) as foo using unique
column name using SRID=srid#' Make sure you put in the 'using unique column
name' and 'using SRID=#' clauses in. For more help, please see
http://postgis.refractions.net/documentation/ Mappostgis.c - version of Jan
23/2004. 

My second attempt:
==================

I tried adding USING UNIQUE to my DATA line. There is something odd with my
spatial table though: whenever I view the data contents with pgAdmin, I can
always see the oid column (first column to the left, before the PK column).
However, I cannot find the oid column when viewing the table's column
definition. The question is: does my table have oid column or not? And does
it have something to do with the error?

Nonethless, here's my lines:
    CONNECTIONTYPE postgis
    CONNECTION 'host=localhost user=rtrw password=123456 port=5432
dbname=test_mapserver'
    DATA 'the_geom from rencana.kawasanbencana using unique oid' 

And I still get the same error message as above. The difference is that the
error message now says 'oid' instead of 'gid'. For instance,
"(the_geom)),'NDR'),gid" becomes "(the_geom)),'NDR'),oid", but everything
else remains the same.

My third attempt:
=================

Like I said in my second attempt, I'm not sure whether my table has oid
column or not. Thus, in my third attempt I used the gid column instead,
especially since the gid column is my primary key column anyway. This is my
lines:
    CONNECTIONTYPE postgis
    CONNECTION 'host=localhost user=rtrw password=123456 port=5432
dbname=test_mapserver'
    DATA 'the_geom from rencana.kawasanbencana using unique gid'

And I got exactly the same error message as my first attempt.

My fourth attempt:
==================

In my fourth attempt, I used the gid column for my unique id, and I am using
SRID=1. Here is the lines:
    CONNECTIONTYPE postgis
    CONNECTION 'host=localhost user=rtrw password=123456 port=5432
dbname=test_mapserver'
    DATA 'the_geom from rencana.kawasanbencana using unique gid using
SRID=1'

Well I still got the error message. This time, the error message is slightly
different. Instead of getting "::BOX3D,find_srid", I got "::BOX3D,1".

Here is the complete error message:
msDrawMap(): Image handling error. Failed to draw layer named
'kawasanbencana'. prepare_database(): Query error. Error executing POSTGIS
DECLARE (the actual query) statement: 'DECLARE mycursor BINARY CURSOR FOR
SELECT asbinary(force_collection(force_2d(the_geom)),'NDR'),gid::text from
rencana.kawasanbencana WHERE () and (the_geom && setSRID(
'BOX3D(528635.525378392 9074209,609092.162121608 9134520)'::BOX3D,1) )'
Postgresql reports the error as 'ERROR: syntax error at or near ")" LINE 1:
...DR'),gid::text from rencana.kawasanbencana WHERE () and (the... ^ ' More
Help: Error with POSTGIS data variable. You specified 'check your .map
file'. Standard ways of specifiying are : (1) 'geometry_column from
geometry_table' (2) 'geometry_column from (sub query) as foo using unique
column name using SRID=srid#' Make sure you put in the 'using unique column
name' and 'using SRID=#' clauses in. For more help, please see
http://postgis.refractions.net/documentation/
 Mappostgis.c - version of Jan 23/2004. 

My fifth attempt:
=================

Now I had been pretty much desperate, I just wrote using SRID=#, closed my
eyes, and hoped for the best. Here's the lines:
    CONNECTIONTYPE postgis
    CONNECTION 'host=localhost user=rtrw password=123456 port=5432
dbname=test_mapserver'
    DATA 'the_geom from rencana.kawasanbencana using unique gid using
SRID=#'

I still get an error message. This time, the error message is different
altogether. Here's the message:
msDrawMap(): Image handling error. Failed to draw layer named
'kawasanbencana'. msPOSTGISLayerParseData(): Query error. Error parsing
POSTGIS data variable: You specified 'using SRID=#' but didnt have any
numbers! More Help: Error with POSTGIS data variable. You specified
'the_geom from rencana.kawasanbencana using unique gid using SRID=#'.
Standard ways of specifiying are : (1) 'geometry_column from geometry_table'
(2) 'geometry_column from (sub query) as foo using unique column name using
SRID=srid#' Make sure you put in the 'using unique column name' and 'using
SRID=#' clauses in. For more help, please see
http://postgis.refractions.net/documentation/ Mappostgis.c - version of Jan
23/2004. 

I'm pretty much desperate. Could somebody please tell what's wrong on my
mapfile? Or maybe ms4w just cannot display postGIS data? Do I need to
install postGIS and MapServer on Linux, in order to get them work together?
Please help. :-(

Thanks,
-Kresh