<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _read_missing_lob_data_from_db(self, readoffset, readlength):
 """Read LOB request part from database"""

        logger.debug('Reading missing lob data from db. Offset: %d, readlength: %d' % (readoffset, readlength))
        lob_data = self._make_read_lob_request(readoffset, readlength)

        # make sure we really got as many items (not bytes!) as requested:
        enc_lob_data = self._decode_lob_data(lob_data)
        assert readlength == len(enc_lob_data), 'expected: %d, received; %d' % (readlength, len(enc_lob_data))

        # jump to end of data, and append new and properly decoded data to it:
        # import pdb;pdb.set_trace()
        self.data.seek(0, SEEK_END)
        self.data.write(enc_lob_data)
        self._current_lob_length = len(self.data.getvalue())