Hello,
I'm trying to use PostGIS with GeoAlchemy, being totally new to both.
According to available documentation and what I need (A point
representing longitude and latitude of row), I have
class PointOfInterest(Base):
__tablename__ = ...
...
geom = geoalchemy.GeometryColumn(Point(2))
To read from geom column, I apparently need:
poi = PointOfInterest()
lon = session.scalar(poi.geom.x)
lat = session.scalar(poi.geom.y)
And to set the value I need
poi.geom = geoalchemy.WKTSpatialElement("POINT({lon}
{lat})".format(lon, lat))
Of course, the above is possibly vulnerable for sql injections so I must
make sure lon and lat are really numbers.
But is there a simpler/safer/saner way to do both? Can I update the geom
column somehow to set only one value of the pair?
Also, I'm not quite sure how to query rows with X, Y being with N units
of a reference point X0, Y0?
Thanks.
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