Hello list,
I can't find an example for a user defined type that has to produce
custom SQL. What I want is to implement a PostGIS geometry column and it
basically has to do two things:
1. Implement own SQL for insert/update, to produce for example:
INSERT INTO .... (..., xyzzy, ....) VALUES (...,
transform(PointFromText( %s ), 4269), 32661) , ....) ....
UPDATE .... SET xyzzy=transform(PointFromText( %s ), 4269), 32661) ...
2. Internally carry a tuple X that will be bound as string "POINT({0}
{1})".format(x[0], x[1])
3. Parse PostgreSQL array result back into tuple X
I've managed to produce #2 and #3 with a UserDefinedType, but I don't
know how to tell it to produce custom SQL, aside to bind_processor, for
#1. I'm also using get_col_spec for the UserDefinedType for DDL.
BTW, GeoAlchemy is beside the point here. I want to learn how to produce
custom types like this.
Thanks,
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