[Mapserver-users] bug postgis query alias
Mark Cave-Ayland
m.cave-ayland at webbased.co.uk
Tue Jun 1 05:37:49 PDT 2004
Hi Vladimir,
I think I know what this might be. We had a similar problem caused by
the fact that the Mapserver lexer has a very limited set of characters
it will let through - the symptom being that Mapserver would truncate my
DATA clause at the offending characters (in our case it was a colon)
whenever I used a casting such as '::bigint' in the DATA string.
The patch we are currently running against 3.6.5 is the following:
--- mapserver-3.6.5.vanilla/maplexer.l Wed Sep 18 16:14:17 2002
+++ mapserver-3.6.5/maplexer.l Fri May 9 16:30:45 2003
@@ -348,7 +348,7 @@
<INITIAL>[a-z/\.][a-z0-9/\._\-\=]* { return(MS_STRING); }
<OBJECT_STRING>[a-z/\.][a-z0-9/\.\-\=]* {
return(MS_STRING); }
-<VALUE_STRING>[a-z/\.][a-z0-9/\. \-\=]* { return(MS_STRING); }
+<VALUE_STRING>[a-z/\.][a-z0-9/\. \-\=:'<>]* { return(MS_STRING); }
<INITIAL>\n { msyylineno++; }
This allow us to use the :'<> characers in a Mapserver DATA clause. If
you also include a \+ in the second regex to allow a + in the data
string then hopefully your query will work. I don't know whether this
has already been resolved in version 4.
I didn't submit this as a patch as I wasn't sure what effect it would
have on the other fields used by Mapserver since VALUE_STRING is not
just used for the DATA clause - one of the other developers should be
able to comment on this.
Hope this helps,
Mark.
---
Mark Cave-Ayland
Webbased Ltd.
Tamar Science Park
Derriford
Plymouth
PL6 8BX
England
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Fax: +44 (0)1752 764446
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> -----Original Message-----
> From: mapserver-users-admin at lists.gis.umn.edu
> [mailto:mapserver-users-admin at lists.gis.umn.edu] On Behalf Of
> Vladimir Guzmán
> Sent: 01 June 2004 13:04
> To: mapserver-users at lists.gis.umn.edu
> Subject: Re: [Mapserver-users] bug postgis query alias
>
>
> Yes, the query runs fine in the pgsql monitor:
> gps=> select gid,'>' as sentido,tiempo,360-rumbo+90 as
> rumbo,velocidad,gps_geom,oid from gps_vehi where
> tiempo>='2004-05-31 05:00:00' and tiempo<='2004-06-02 04:59:59';
> gid | sentido | tiempo | rumbo | velocidad |
> gps_geom | oid
> -------+---------+---------------------+-------+-----------+--
-------------------------------+---------
> 46275 | > | 2004-05-31 15:16:09 | 450 | 0 |
> SRID=1;POINT(-74.06318 4.67302) | 7731018
> 46276 | > | 2004-05-31 15:16:15 | 450 | 0 |
> SRID=1;POINT(-74.06318 4.67302) | 7731019
> 46277 | > | 2004-05-31 15:16:21 | 450 | 0 |
> SRID=1;POINT(-74.06319 4.67301) | 7731020
> ...
> ...
>
> The error is just:
>
> *Warning*: MapServer Error in msDrawMap(): Failed to draw
> layer named
> 'puntosgps'.
> in */usr/local/apache/htdocs/gps/index.phtml* on line *33*
>
>
> Vladimir Ilich Guzmán R.
> ------------------------
> http://maintask.com
>
>
>
> strk wrote:
>
> >On Mon, May 31, 2004 at 03:29:45PM -0500, Vladimir Guzmán wrote:
> >
> >
> >>Hello.
> >>I'm implementing a gps tracking system.
> >>I want to show the car's orientation like this:
> >>http://maintask.com/test.png The layer's data is something
> like this:
> >>-----------------------------
> >>gps_geom from (select gid,sentido,tiempo,360-rumbo+90 as
> >>rumbo,velocidad,gps_geom,oid from gps_vehi where
> tiempo>='2004-05-29
> >>05:00:00' and tiempo<='2004-05-30 04:59:59') as foo using
> unique gid
> >>using srid=1
> >>-----------------------------
> >>The field 'sentido' contains '>'.
> >>
> >>The problem is that if I use something like this:
> >>-----------------------------
> >>gps_geom from (select gid,'>' as sentido,tiempo,360-rumbo+90 as
> >>rumbo,velocidad,gps_geom,oid from gps_vehi where
> tiempo>='2004-05-29
> >>05:00:00' and tiempo<='2004-05-30 04:59:59') as foo using
> unique gid
> >>using srid=1
> >>-----------------------------
> >>The query doesn't work.
> >>
> >>So I had to create a column in potgres called 'sentido' and all the
> >>rows
> >>containing '>'.
> >>
> >>Is this a bug?
> >>
> >>
> >
> >What's the error message ?
> >Can you run the query from the pgsql monitor ?
> >--strk;
> >
> >
> >
> >>The rest of the layer:
> >>
> >>LAYER
> >> NAME "puntosgps"
> >> CONNECTIONTYPE postgis
> >> CONNECTION "user=gps password=gps dbname=gps host=localhost" DATA
> >>"gps_geom from (select gid,sentido,tiempo,360-rumbo+90 as
> >>rumbo,velocidad,gps_geom,oid from gps_vehi where
> tiempo>='2004-05-29
> >>05:00:00' and tiempo<='2004-05-30 04:59:59') as foo using
> unique gid
> >>using srid=1" TYPE POINT
> >>PROJECTION
> >> "proj=latlong"
> >> "datum=WGS84"
> >>END
> >> LABELANGLEITEM 'rumbo'
> >> LABELITEM 'sentido'
> >> CLASS
> >> NAME 'Parado'
> >> EXPRESSION ([velocidad] = 0)
> >> SIZE 14
> >> SYMBOL 'circle'
> >> COLOR 0 0 215
> >> OUTLINECOLOR 204 204 204
> >> END
> >> CLASS
> >> NAME '0-10'
> >> EXPRESSION ([velocidad] > 0 AND[velocidad] <= 10)
> >> SIZE 14
> >> SYMBOL 'circle'
> >> COLOR 255 255 204
> >> OUTLINECOLOR 204 204 204
> >> LABEL
> >> TYPE TRUETYPE
> >> FORCE TRUE
> >> FONT arial
> >> ANTIALIAS TRUE
> >> COLOR 0 0 0
> >> OUTLINECOLOR 255 255 255
> >> SIZE 8
> >> END
> >> END
> >>...
> >>...
> >>
> >>Thanks a lot.
> >>
> >>--
> >>Vladimir Ilich Guzmán R.
> >>------------------------
> >>http://maintask.com
> >>
> >>
> >>_______________________________________________
> >>Mapserver-users mailing list Mapserver-users at lists.gis.umn.edu
> >>http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
> >>
> >>
> >_______________________________________________
> >Mapserver-users mailing list
> >Mapserver-users at lists.gis.umn.edu
> >http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
> >
> >
> >
> >
>
>
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