geoalchemy | 易学教程

How to convert SDO_GEOMTRY in GeoJSON

阅读更多关于 How to convert SDO_GEOMTRY in GeoJSON

问题 I work with sqlalchemy and geoalchemy and will convert my results in geojson. With the normal way like this : print json.dumps([dict(r) for r in connection.execute(query)]) it is not possible because cx_Oracle.Objets not serializable! I can have access through the separate attributes like this one: result = connection.execute(query) result2 = result.fetchone()[0] print result2.SDO_ORDINATES Here is my Programm: #!/usr/bin/env python # coding: utf8 #from __future__ import absolute_import,

SQLAlchemy Reflection Using Metaclass with Column Override

阅读更多关于 SQLAlchemy Reflection Using Metaclass with Column Override

问题 I have a set of dynamic database tables (Postgres 9.3 with PostGIS) that I am mapping using a python metaclass: cls = type(str(tablename), (db.Model,), {'__tablename__':tablename}) where, db.Model is the db object via flask-sqlalchemy and tablename is a bit of unicode. The cls is then added to an application wide dictionary current_app.class_references (using Flask's current_app) to avoid attempts to instantiate the class multiple times. Each table contains a geometry column, wkb_geometry

GeoAlchemy2 store point and query results

阅读更多关于 GeoAlchemy2 store point and query results

问题 The documentation on GeoAlchemy2 doesn't seem fully featured (as compared to the pervious version). I have a model: class AddressCode(Base): __tablename__ = 'address_codes' id = Column(Integer, primary_key=True) code = Column(Unicode(34)) geometry = Column(Geometry('POINT')) And I want to store lat/long data, which I tried to save in the above model, example "51.42553,-0.666085" Which gives me the error: "Parse error at position 9 within Geometry (the "," char") Anyone able to shed some light

GeoAlchemy2 store point and query results

阅读更多关于 GeoAlchemy2 store point and query results

The documentation on GeoAlchemy2 doesn't seem fully featured (as compared to the pervious version). I have a model: class AddressCode(Base): __tablename__ = 'address_codes' id = Column(Integer, primary_key=True) code = Column(Unicode(34)) geometry = Column(Geometry('POINT')) And I want to store lat/long data, which I tried to save in the above model, example "51.42553,-0.666085" Which gives me the error: "Parse error at position 9 within Geometry (the "," char") Anyone able to shed some light on where I am going wrong here? Also on the subject, how would I peform a query to say.. Show nearest