You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
33 lines
1.2 KiB
33 lines
1.2 KiB
""" |
|
This object provides quoting for GEOS geometries into PostgreSQL/PostGIS. |
|
""" |
|
|
|
from django.contrib.gis.db.backend.postgis.query import GEOM_FROM_WKB |
|
from psycopg2 import Binary |
|
from psycopg2.extensions import ISQLQuote |
|
|
|
class PostGISAdaptor(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.wkb = str(geom.wkb) |
|
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.wkb == other.wkb) 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 "%s(%s, %s)" % (GEOM_FROM_WKB, Binary(self.wkb), self.srid or -1)
|
|
|