def set_db_opts(self, dbname="mta4", credentials=True):
        """
        Add db connection specific attributes
        """
        from jcvi.utils.db import valid_dbconn, get_profile

        self.add_option("--db", default=dbname, dest="dbname",
                help="Specify name of database to query [default: %default]")
        self.add_option("--connector", default="Sybase", dest="dbconn",
                choices=valid_dbconn.keys(), help="Specify database connector [default: %default]")
        hostname, username, password = get_profile()
        if credentials:
            self.add_option("--hostname", default=hostname,
                    help="Specify hostname [default: %default]")
            self.add_option("--username", default=username,
                    help="Username to connect to database [default: %default]")
            self.add_option("--password", default=password,
                    help="Password to connect to database [default: %default]")
        self.add_option("--port", type="int",
                help="Specify port number [default: %default]")
Add db connection specific attributes