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Viewing changes to django/contrib/gis/db/backend/spatialite/__init__.py

  • Committer: Bazaar Package Importer
  • Author(s): Chris Lamb
  • Date: 2010-05-21 07:52:55 UTC
  • mfrom: (1.3.6 upstream)
  • mto: This revision was merged to the branch mainline in revision 28.
  • Revision ID: james.westby@ubuntu.com-20100521075255-ii78v1dyfmyu3uzx
Tags: upstream-1.2
Import upstream version 1.2

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django/contrib/gis/db/backend/spatialite/__init__.py
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__all__ = ['create_test_spatial_db', 'get_geo_where_clause', 'SpatialBackend']
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from ctypes.util import find_library
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from django.conf import settings
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from django.db.backends.signals import connection_created
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from django.contrib.gis.db.backend.base import BaseSpatialBackend
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from django.contrib.gis.db.backend.spatialite.adaptor import SpatiaLiteAdaptor
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from django.contrib.gis.db.backend.spatialite.creation import create_test_spatial_db
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from django.contrib.gis.db.backend.spatialite.field import SpatiaLiteField
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from django.contrib.gis.db.backend.spatialite.models import GeometryColumns, SpatialRefSys
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from django.contrib.gis.db.backend.spatialite.query import *
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# Here we are figuring out the path to the SpatiLite library (`libspatialite`).
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# If it's not in the system PATH, it may be set manually in the settings via
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# the `SPATIALITE_LIBRARY_PATH` setting.
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spatialite_lib = getattr(settings, 'SPATIALITE_LIBRARY_PATH', find_library('spatialite'))
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if spatialite_lib:
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    def initialize_spatialite(sender=None, **kwargs):
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        """
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        This function initializes the pysqlite2 connection to enable the
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        loading of extensions, and to load up the SpatiaLite library
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        extension.
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        """
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        from django.db import connection
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        connection.connection.enable_load_extension(True)
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        connection.cursor().execute("SELECT load_extension(%s)", (spatialite_lib,))
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    connection_created.connect(initialize_spatialite)
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else:
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    # No SpatiaLite library found.
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    raise Exception('Unable to locate SpatiaLite, needed to use GeoDjango with sqlite3.')
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SpatialBackend = BaseSpatialBackend(name='spatialite', spatialite=True,
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                                    area=AREA,
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                                    centroid=CENTROID,
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                                    contained=CONTAINED,
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                                    difference=DIFFERENCE,
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                                    distance=DISTANCE,
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                                    distance_functions=DISTANCE_FUNCTIONS,
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                                    envelope=ENVELOPE,
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                                    from_text=GEOM_FROM_TEXT,
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                                    gis_terms=SPATIALITE_TERMS,
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                                    intersection=INTERSECTION,
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                                    length=LENGTH,
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                                    num_geom=NUM_GEOM,
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                                    num_points=NUM_POINTS,
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                                    point_on_surface=POINT_ON_SURFACE,
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                                    scale=SCALE,
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                                    select=GEOM_SELECT,
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                                    svg=ASSVG,
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                                    sym_difference=SYM_DIFFERENCE,
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                                    transform=TRANSFORM,
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                                    translate=TRANSLATE,
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                                    union=UNION,
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                                    unionagg=UNIONAGG,
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                                    Adaptor=SpatiaLiteAdaptor,
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                                    Field=SpatiaLiteField,
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                                    GeometryColumns=GeometryColumns,
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                                    SpatialRefSys=SpatialRefSys,
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                                    )