Fixed #16778 -- Improved escaping of geometries on PostgreSQL, allowing…

Fixed #16778 -- Improved escaping of geometries on PostgreSQL, allowing GeoDjango to work on 9.1.  Thanks, piro for ticket and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16826 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/gis/db/backends/postgis/adapter.py

@@ -12,6 +12,7 @@ class PostGISAdapter(object):
         # the adaptor) and the SRID from the geometry.
         self.ewkb = str(geom.ewkb)
         self.srid = geom.srid
+        self._adapter = Binary(self.ewkb)
 
     def __conform__(self, proto):
         # Does the given protocol conform to what Psycopg2 expects?
@@ -28,10 +29,17 @@ class PostGISAdapter(object):
     def __str__(self):
         return self.getquoted()
 
+    def prepare(self, conn):
+        """
+        This method allows escaping the binary in the style required by the
+        server's `standard_conforming_string` setting.
+        """
+        self._adapter.prepare(conn)
+
     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)
+        # psycopg will figure out whether to use E'\\000' or '\000'
+        return 'ST_GeomFromEWKB(%s)' % self._adapter.getquoted()
 
     def prepare_database_save(self, unused):
         return self