Is there any way to retrieve the database dialect that a specific
session is using?  e.g. MySQL, PostGIS, etc.

I am trying to modify Sanjiv Singh's GeoAlchemy extension so that a
person can retrieve the appropriate database procedure for a given
dialect, so that geospatial queries can be both direct (performed in a
single database call) as well as dialect-neutral.

For example, in PostGIS, getting the WKT of a geometry requires func.ST_AsText()
session.query(func.ST_AsText(Road.geom)).first()

However, in MySQL, the same procedure requires func.AsText()
session.query(func.AsText(Road.geom)).first()

I would like to be able to create a function called wkt() in both
geoalchemy/mysql.py and geoalchemy/postgis.py that enables me to the
following:
session.query(session.dialect.wkt(Road.geom)).first()

Thanks,
Roy Hyunjin Han
Modi Research Group
Earth Institute at Columbia University
http://modi.mech.columbia.edu

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