/django/contrib/gis/db/backends/postgis/adapter.py
Python | 35 lines | 21 code | 7 blank | 7 comment | 3 complexity | f10591ed4595da6a3b6be23a7b12c20c MD5 | raw file
Possible License(s): BSD-3-Clause
- """
- This object provides quoting for GEOS geometries into PostgreSQL/PostGIS.
- """
- from psycopg2 import Binary
- from psycopg2.extensions import ISQLQuote
- class PostGISAdapter(object):
- def __init__(self, geom):
- "Initializes on the geometry."
- # Getting the WKB (in string form, to allow easy pickling of
- # the adaptor) and the SRID from the geometry.
- self.ewkb = str(geom.ewkb)
- self.srid = geom.srid
- def __conform__(self, proto):
- # Does the given protocol conform to what Psycopg2 expects?
- if proto == ISQLQuote:
- return self
- else:
- raise Exception('Error implementing psycopg2 protocol. Is psycopg2 installed?')
- def __eq__(self, other):
- return (self.ewkb == other.ewkb) and (self.srid == other.srid)
- def __str__(self):
- return self.getquoted()
- def getquoted(self):
- "Returns a properly quoted string for use in PostgreSQL/PostGIS."
- # Want to use WKB, so wrap with psycopg2 Binary() to quote properly.
- return 'ST_GeomFromEWKB(E%s)' % Binary(self.ewkb)
- def prepare_database_save(self, unused):
- return self