from django.core.management.base import NoArgsCommand, CommandError

class Command(NoArgsCommand):

    help = "Runs the command-line client for the current DATABASE_ENGINE."

    requires_model_validation = False

    def handle_noargs(self, **options):

        from django.db import connection

        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)