django1/django/core/management/commands/dbshell.py

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from optparse import make_option
from django.core.management.base import BaseCommand, CommandError
from django.db import connections, DEFAULT_DB_ALIAS
class Command(BaseCommand):
help = ("Runs the command-line client for specified database, or the "
"default database if none is provided.")
option_list = BaseCommand.option_list + (
make_option('--database', action='store', dest='database',
default=DEFAULT_DB_ALIAS, help='Nominates a database onto which to '
'open a shell. Defaults to the "default" database.'),
)
requires_model_validation = False
def handle(self, **options):
connection = connections[options.get('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)