59 lines
3.1 KiB
Python
59 lines
3.1 KiB
Python
from ctypes.util import find_library
|
|
from django.conf import settings
|
|
|
|
from django.core.exceptions import ImproperlyConfigured
|
|
from django.db.backends.sqlite3.base import (
|
|
_sqlite_extract, _sqlite_date_trunc, _sqlite_regexp, _sqlite_format_dtdelta,
|
|
connection_created, Database, DatabaseWrapper as SQLiteDatabaseWrapper,
|
|
SQLiteCursorWrapper)
|
|
from django.contrib.gis.db.backends.spatialite.client import SpatiaLiteClient
|
|
from django.contrib.gis.db.backends.spatialite.creation import SpatiaLiteCreation
|
|
from django.contrib.gis.db.backends.spatialite.introspection import SpatiaLiteIntrospection
|
|
from django.contrib.gis.db.backends.spatialite.operations import SpatiaLiteOperations
|
|
|
|
class DatabaseWrapper(SQLiteDatabaseWrapper):
|
|
def __init__(self, *args, **kwargs):
|
|
# Before we get too far, make sure pysqlite 2.5+ is installed.
|
|
if Database.version_info < (2, 5, 0):
|
|
raise ImproperlyConfigured('Only versions of pysqlite 2.5+ are '
|
|
'compatible with SpatiaLite and GeoDjango.')
|
|
|
|
# Trying to find the location of the SpatiaLite library.
|
|
# Here we are figuring out the path to the SpatiaLite library
|
|
# (`libspatialite`). If it's not in the system library path (e.g., it
|
|
# cannot be found by `ctypes.util.find_library`), then it may be set
|
|
# manually in the settings via the `SPATIALITE_LIBRARY_PATH` setting.
|
|
self.spatialite_lib = getattr(settings, 'SPATIALITE_LIBRARY_PATH',
|
|
find_library('spatialite'))
|
|
if not self.spatialite_lib:
|
|
raise ImproperlyConfigured('Unable to locate the SpatiaLite library. '
|
|
'Make sure it is in your library path, or set '
|
|
'SPATIALITE_LIBRARY_PATH in your settings.'
|
|
)
|
|
super(DatabaseWrapper, self).__init__(*args, **kwargs)
|
|
self.ops = SpatiaLiteOperations(self)
|
|
self.client = SpatiaLiteClient(self)
|
|
self.creation = SpatiaLiteCreation(self)
|
|
self.introspection = SpatiaLiteIntrospection(self)
|
|
|
|
def get_new_connection(self, conn_params):
|
|
conn = super(DatabaseWrapper, self).get_new_connection(conn_params)
|
|
# Enabling extension loading on the SQLite connection.
|
|
try:
|
|
conn.enable_load_extension(True)
|
|
except AttributeError:
|
|
raise ImproperlyConfigured(
|
|
'The pysqlite library does not support C extension loading. '
|
|
'Both SQLite and pysqlite must be configured to allow '
|
|
'the loading of extensions to use SpatiaLite.')
|
|
# Loading the SpatiaLite library extension on the connection, and returning
|
|
# the created cursor.
|
|
cur = conn.cursor(factory=SQLiteCursorWrapper)
|
|
try:
|
|
cur.execute("SELECT load_extension(%s)", (self.spatialite_lib,))
|
|
except Exception as msg:
|
|
raise ImproperlyConfigured('Unable to load the SpatiaLite library extension '
|
|
'"%s" because: %s' % (self.spatialite_lib, msg))
|
|
cur.close()
|
|
return conn
|