Object Database (ODBMS) for Python

[Patrick K. O'Brien]

pobrien at orbtech.com (Patrick K. O'Brien) writes:

> I hope that helps demonstrate some of what it can do.

I forgot to show a cool feature:

>>> t = tx.Delete(u1)
>>> db.execute(t)
Traceback (most recent call last):
  File "<input>", line 1, in ?
  File "/home/pobrien/Code/pypersyst/database.py", line 27, in execute
    return self._engine.execute(transaction)
  File "/home/pobrien/Code/pypersyst/engine/engine.py", line 75, in execute
    return transaction.execute(self._root)
  File "/home/pobrien/Code/pypersyst/entity/transaction.py", line 49, in execute
    return root[self.classname]._delete(self.oid)
  File "/home/pobrien/Code/pypersyst/entity/extent.py", line 204, in _delete
    raise error.DeleteRestricted, 'instance is referenced elsewhere'
DeleteRestricted: instance is referenced elsewhere
>>> 

What's that?  You don't recall seeing referential integrity rules
defined in the schema, or in the application code?  That's right, you
didn't.  Curious?

-- 
Patrick K. O'Brien
Orbtech      http://www.orbtech.com/web/pobrien
-----------------------------------------------
"Your source for Python programming expertise."
-----------------------------------------------