Coldfusion uses inner db connection when nesting cfquery

When you implement a nested cfquery to different datasources, ColdFusion will use the inner connection for both queries. Symptoms are that tables can not be found: ERROR: relation "mapdef" does not exist

<cfquery datasource="vista_monitoring2" name="x">
select * from mapdef limit 1
<cfquery datasource="vista_wintermanagement_r" name="y">
select * from rides limit 1
</cfquery>
</cfquery>

oracle odbc very slow in ogr/mapserver

Today i converted an adress-table from mysql to oracle (9.2). The data is presented on a map using virtual spatial data over odbc. It appeared the oracle odbc connection was very slow (up to a minute for a couple of records). After a search on google i found some suggestions:
- enable tracing in odbc to see what data is send and recieved (it appeared all the oracle tables where investigated, since there are 100's, it takes a while)
- in this post http://osdir.com/ml/gis.mapserver.user/2004-07/msg00245.html JF presents a solution 4 this by adding the tablename to the DSN-definition in the ovf file
That helped, response time dimished to fractions of a second


ODBC:me/secret@db,table table
wkbPoint

ID

Install a routing mechanism on postgis (windows).

based on http://pgrouting.postlbs.org/wiki/WorkshopFOSS4G2007

download and install
- postgres 8.2 (pgRouting is not yet available as binary for postgres 8.3)
- postgis (comes with postgres 8.2)
- pgRouting 1.0

C:
cd Program Files\PostgreSQL\8.2\bin

//create db
createdb -U postgres -E UNICODE routing
createlang -U postgres plpgsql routing

//load postgis and pgrouting into db
psql -U postgres -f ../share/contrib/lwpostgis.sql routing
psql -U postgres -f ../share/contrib/spatial_ref_sys.sql routing
psql -U postgres -f ../share/contrib/routing_core.sql routing
psql -U postgres -f ../share/contrib/routing_core_wrappers.sql routing

//load datafile generated witd shp2pgsql

//add columns
ALTER TABLE dummy ADD COLUMN source integer;
ALTER TABLE dummy ADD COLUMN target integer;
ALTER TABLE dummy ADD COLUMN length double precision;
UPDATE dummy SET length = length(the_geom);

//create network
SELECT assign_vertex_id('dummy', 0.001, 'the_geom', 'gid');

//optimise table
CREATE INDEX source_idx ON dummy(source);
CREATE INDEX target_idx ON dummy(target);
CREATE INDEX geom_idx ON dummy USING GIST(the_geom GIST_GEOMETRY_OPS);

//test network trace
SELECT gid, AsText(the_geom) AS the_geom FROM dijkstra_sp('dummy', 1, 100);

//update srid (option)
select updategeometrysrid('dummy', 'the_geom', 4326);
update dummy set the_geom = setsrid(the_geom,4326);

//finished! now check out http://boston.freemap.in/routing.html for implementation options!

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SRID stuff in PostGIS

Got these errors?

ERROR: Operation on mixed SRID geometries

ERROR: new row for relation "dummy" violates check constraint "enforce_srid_the_geom"

Be sure all your geometry tables share the same srid! Srid is defined in tabel geometry_columns. update srid in this table using this statement:

select updategeometrysrid('dummy', 'the_geom', 4326);

Next update the srid in the geometries itself using this statement:

update dummy set the_geom = setsrid(the_geom,4326);

check it using:

select getsrid(the_geom) from dummy

select asewkt(the_geom) from dummy limit 10

Map file export from qgis

In QGis (a desktop GIS client supporting esri-shape, postgis, wms...) you can export a project as a umn mapserver mapfile. When i tried that out yesterday, QGis 9.1 threw an error: map export error:ms_export phyton module not found. I tried replacing ms_export.py by a new one, but that didn't work out. Today i installed QGis 9.2 rc1. In QGis 9.2 ms_export is converted to a real plugin (amongst many other improvements). Also debugging is better, it still threw the same error, but the message was more descriptive! It appeared i forgot to select a project file, in the export-window. Export was succesful! http://guinea.genuchten.net

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