Add support for prefetching fields
This makes it possible to specify the fields that should be
prefetched as part of a getForFields query. Doing a prefetch on a
ReferenceProperty when it is known that the property will be
referenced in (almost all) entities is far more efficient than
doing the invididual fetches sequentially.
from django.db.backends import BaseDatabaseClient
from django.conf import settings
import os
class DatabaseClient(BaseDatabaseClient):
executable_name = 'psql'
def runshell(self):
args = [self.executable_name]
if settings.DATABASE_USER:
args += ["-U", settings.DATABASE_USER]
if settings.DATABASE_PASSWORD:
args += ["-W"]
if settings.DATABASE_HOST:
args.extend(["-h", settings.DATABASE_HOST])
if settings.DATABASE_PORT:
args.extend(["-p", str(settings.DATABASE_PORT)])
args += [settings.DATABASE_NAME]
os.execvp(self.executable_name, args)