1 from optparse import make_option

     2 

     3 from django.core.management.base import BaseCommand, CommandError

     4 from django.db import connections, DEFAULT_DB_ALIAS

     5 

     6 class Command(BaseCommand):

     7     help = ("Runs the command-line client for specified database, or the "

     8         "default database if none is provided.")

     9 

    10     option_list = BaseCommand.option_list + (

    11         make_option('--database', action='store', dest='database',

    12             default=DEFAULT_DB_ALIAS, help='Nominates a database onto which to '

    13                 'open a shell.  Defaults to the "default" database.'),

    14     )

    15 

    16     requires_model_validation = False

    17 

    18     def handle(self, **options):

    19         connection = connections[options.get('database', DEFAULT_DB_ALIAS)]

    20         try:

    21             connection.client.runshell()

    22         except OSError:

    23             # Note that we're assuming OSError means that the client program

    24             # isn't installed. There's a possibility OSError would be raised

    25             # for some other reason, in which case this error message would be

    26             # inaccurate. Still, this message catches the common case.

    27             raise CommandError('You appear not to have the %r program installed or on your path.' % \

    28                 connection.client.executable_name)