import os

import sys

from django.db.backends import BaseDatabaseClient

class DatabaseClient(BaseDatabaseClient):

    executable_name = 'psql'

    def runshell(self):

        settings_dict = self.connection.settings_dict

        args = [self.executable_name]

        if settings_dict['USER']:

            args += ["-U", settings_dict['USER']]

        if settings_dict['HOST']:

            args.extend(["-h", settings_dict['HOST']])

        if settings_dict['PORT']:

            args.extend(["-p", str(settings_dict['PORT'])])

        args += [settings_dict['NAME']]

        if os.name == 'nt':

            sys.exit(os.system(" ".join(args)))

        else:

            os.execvp(self.executable_name, args)