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from django.core.management.base import BaseCommand, CommandError
from django.db import DEFAULT_DB_ALIAS, connections
class Command(BaseCommand):
help = (
"Runs the command-line client for specified database, or the "
"default database if none is provided."
)
requires_system_checks = False
def add_arguments(self, parser):
parser.add_argument(
'--database', action='store', dest='database', default=DEFAULT_DB_ALIAS,
help='Nominates a database onto which to open a shell. Defaults to the "default" database.',
)
def handle(self, **options):
connection = connections[options['database']]
try:
connection.client.runshell()
except OSError:
# Note that we're assuming OSError means that the client program
# isn't installed. There's a possibility OSError would be raised
# for some other reason, in which case this error message would be
# inaccurate. Still, this message catches the common case.
raise CommandError(
'You appear not to have the %r program installed or on your path.' %
connection.client.executable_name
)
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