code: def exists(self, **kwargs):
          
          name = kwargs.pop('name', 'default')
          site = kwargs.pop('site', None)
          r = self.database_renderer(name=name, site=site)
          ret = r.run('mysql -h {db_host} -u {db_root_username} '\
              '-p"{db_root_password}" -N -B -e "SELECT IF(\'{db_name}\''\
              ' IN(SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA), '\
              '\'exists\', \'notexists\') AS found;"')
          if ret is not None:
              ret = 'notexists' not in (ret or 'notexists')
          if ret is not None:
              msg = '%s database on site %s %s exist.' \
                  % (name.title(), env.SITE, 'DOES' if ret else 'DOES NOT')
              if ret:
                  print(green(msg))
              else:
                  print(red(msg))
              return ret
docs: Returns true if a database with the given name exists. False otherwise.