| 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): |
| cursor = self.connection.cursor() |
| try: |
| # 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, msg: |
| raise Exception('Could not find entry in USER_SDO_GEOM_METADATA corresponding to "%s"."%s"\n' |
| 'Error message: %s.' % (table_name, geo_col, msg)) |
| |
| # 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 |
| # Length of object array ( SDO_DIM_ARRAY ) is number of dimensions. |
| dim = len(dim) |
| if dim != 2: |
| field_params['dim'] = dim |
| finally: |
| cursor.close() |
| |
| return field_type, field_params |
