def __potential_connection_failure(self, e):
try:<EOL><INDENT>self._conn.query('<STR_LIT>')<EOL><DEDENT>except (IOError, _mysql.OperationalError):<EOL><INDENT>self.__handle_connection_failure(e)<EOL><DEDENT>else:<EOL><INDENT>raise _mysql.DatabaseError(*e.args)<EOL><DEDENT>
OperationalError's are emitted by the _mysql library for
        almost every error code emitted by MySQL.  Because of this we
        verify that the error is actually a connection error before
        terminating the connection and firing off a PoolConnectionException