def _sincedb_start_position(self):
if not self._sincedb_path:<EOL><INDENT>return None<EOL><DEDENT>self._sincedb_init()<EOL>self._log_debug('<STR_LIT>')<EOL>conn = sqlite3.connect(self._sincedb_path, isolation_level=None)<EOL>cursor = conn.cursor()<EOL>cursor.execute('<STR_LIT>', {<EOL>'<STR_LIT>': self._fid,<EOL>'<STR_LIT:filename>': self._filename<EOL>})<EOL>start_position = None<EOL>for row in cursor.fetchall():<EOL><INDENT>start_position, = row<EOL><DEDENT>return start_position<EOL>
Retrieves the starting position from the sincedb sql db
        for a given file