| 123456789101112131415161718192021222324252627282930313233343536373839404142 |
- import cx_Oracle
-
- from django.db.backends.oracle.introspection import DatabaseIntrospection
-
-
- class OracleIntrospection(DatabaseIntrospection):
- # Associating any OBJECTVAR instances with GeometryField. Of course,
- # this won't work right on Oracle objects that aren't MDSYS.SDO_GEOMETRY,
- # but it is the only object type supported within Django anyways.
- data_types_reverse = DatabaseIntrospection.data_types_reverse.copy()
- data_types_reverse[cx_Oracle.OBJECT] = 'GeometryField'
-
- def get_geometry_type(self, table_name, geo_col):
- with self.connection.cursor() as cursor:
- # Querying USER_SDO_GEOM_METADATA to get the SRID and dimension information.
- try:
- cursor.execute(
- 'SELECT "DIMINFO", "SRID" FROM "USER_SDO_GEOM_METADATA" '
- 'WHERE "TABLE_NAME"=%s AND "COLUMN_NAME"=%s',
- (table_name.upper(), geo_col.upper())
- )
- row = cursor.fetchone()
- except Exception as exc:
- raise Exception(
- 'Could not find entry in USER_SDO_GEOM_METADATA '
- 'corresponding to "%s"."%s"' % (table_name, geo_col)
- ) from exc
-
- # TODO: Research way to find a more specific geometry field type for
- # the column's contents.
- field_type = 'GeometryField'
-
- # Getting the field parameters.
- field_params = {}
- dim, srid = row
- if srid != 4326:
- field_params['srid'] = srid
- # Size of object array (SDO_DIM_ARRAY) is number of dimensions.
- dim = dim.size()
- if dim != 2:
- field_params['dim'] = dim
- return field_type, field_params
|
