1 __all__ = ['create_test_spatial_db', 'get_geo_where_clause', 'SpatialBackend']

     2 

     3 from ctypes.util import find_library

     4 from django.conf import settings

     5 from django.db.backends.signals import connection_created

     6 

     7 from django.contrib.gis.db.backend.base import BaseSpatialBackend

     8 from django.contrib.gis.db.backend.spatialite.adaptor import SpatiaLiteAdaptor

     9 from django.contrib.gis.db.backend.spatialite.creation import create_test_spatial_db

    10 from django.contrib.gis.db.backend.spatialite.field import SpatiaLiteField

    11 from django.contrib.gis.db.backend.spatialite.models import GeometryColumns, SpatialRefSys

    12 from django.contrib.gis.db.backend.spatialite.query import *

    13 

    14 # Here we are figuring out the path to the SpatiLite library (`libspatialite`).

    15 # If it's not in the system PATH, it may be set manually in the settings via

    16 # the `SPATIALITE_LIBRARY_PATH` setting.

    17 spatialite_lib = getattr(settings, 'SPATIALITE_LIBRARY_PATH', find_library('spatialite'))

    18 if spatialite_lib:

    19     def initialize_spatialite(sender=None, **kwargs):

    20         """

    21         This function initializes the pysqlite2 connection to enable the

    22         loading of extensions, and to load up the SpatiaLite library

    23         extension.

    24         """

    25         from django.db import connection

    26         connection.connection.enable_load_extension(True)

    27         connection.cursor().execute("SELECT load_extension(%s)", (spatialite_lib,))

    28     connection_created.connect(initialize_spatialite)

    29 else:

    30     # No SpatiaLite library found.

    31     raise Exception('Unable to locate SpatiaLite, needed to use GeoDjango with sqlite3.')

    32 

    33 SpatialBackend = BaseSpatialBackend(name='spatialite', spatialite=True,

    34                                     area=AREA,

    35                                     centroid=CENTROID,

    36                                     contained=CONTAINED,

    37                                     difference=DIFFERENCE,

    38                                     distance=DISTANCE,

    39                                     distance_functions=DISTANCE_FUNCTIONS,

    40                                     envelope=ENVELOPE,

    41                                     from_text=GEOM_FROM_TEXT,

    42                                     gis_terms=SPATIALITE_TERMS,

    43                                     intersection=INTERSECTION,

    44                                     length=LENGTH,

    45                                     num_geom=NUM_GEOM,

    46                                     num_points=NUM_POINTS,

    47                                     point_on_surface=POINT_ON_SURFACE,

    48                                     scale=SCALE,

    49                                     select=GEOM_SELECT,

    50                                     svg=ASSVG,

    51                                     sym_difference=SYM_DIFFERENCE,

    52                                     transform=TRANSFORM,

    53                                     translate=TRANSLATE,

    54                                     union=UNION,

    55                                     unionagg=UNIONAGG,

    56                                     Adaptor=SpatiaLiteAdaptor,

    57                                     Field=SpatiaLiteField,

    58                                     GeometryColumns=GeometryColumns,

    59                                     SpatialRefSys=SpatialRefSys,

    60                                     )