Handles simple, SQL specific connection creation.  This will not
        have to manage thread information as it is already managed within
        the main open method for the SQLBase class.

        :param      db | <orb.Database>

        :return     <variant> | backend specific database connection

def _open(self, db, writeAccess=False):
        """
        Handles simple, SQL specific connection creation.  This will not
        have to manage thread information as it is already managed within
        the main open method for the SQLBase class.

        :param      db | <orb.Database>

        :return     <variant> | backend specific database connection
        """
        if not pymysql:
            raise orb.errors.BackendNotFound('psycopg2 is not installed.')

        # create the python connection
        try:
            return pymysql.connect(db=db.name(),
                                   user=db.username(),
                                   passwd=db.password(),
                                   host=(db.writeHost() if writeAccess else db.host()) or 'localhost',
                                   port=db.port() or 3306,
                                   cursorclass=pymysql.cursors.DictCursor)
        except pymysql.OperationalError as err:
            log.exception('Failed to connect to postgres')
            raise orb.errors.ConnectionFailed()