<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _update_metadata(self):
 """ Updates the metadata of the stored routine. """

        self._pystratum_metadata['routine_name'] = self._routine_name
        self._pystratum_metadata['designation'] = self._designation_type
        self._pystratum_metadata['table_name'] = self._table_name
        self._pystratum_metadata['parameters'] = self._parameters
        self._pystratum_metadata['columns'] = self._columns
        self._pystratum_metadata['fields'] = self._fields
        self._pystratum_metadata['column_types'] = self._columns_types
        self._pystratum_metadata['timestamp'] = self._m_time
        self._pystratum_metadata['replace'] = self._replace
        self._pystratum_metadata['pydoc'] = self._doc_block_parts_wrapper