def get_last_tid(self):
        try:
            spec = {'tid': {'$gt': 0}}
            sort = [('tid', -1)]
            row = self.db.docs.find_one(spec, sort=sort)
        except Exception as e:
            raise DatabaseException(e)
        if row:
            return row['tid']
        return 0
def test_simple_structs(self):
        for code, tp in self.formats.items():
            class X(Structure):
                _fields_ = [("x", c_char),
                            ("y", tp)]
            self.assertEqual((sizeof(X), code),
                                 (calcsize("c%c0%c" % (code, code)), code))