support "ON DELETE/UPDATE" in Foreign Key Reflection

[Former user]

When reflecting a table, a Foreign Key's ON DELETE/UPDATE settings are not picked up.

Based on discussion here:

http://groups.google.com/group/sqlalchemy/browse_thread/thread/6fa4aca51ba5b2d

[Mike Bayer]

it goes without saying this is not a trivial task as we'd need to figure it out for every database individually...

[Mike Bayer]

we already do this for MySQL. For Postgresql we have https://github.com/zzzeek/sqlalchemy/pull/34. so the spec here is that it's part of "options" in the FK spec.

next part, this is fairly straightforward, link up those options in reflection.py where we generate the ForeignKeyConstraint.

[Mike Bayer]

mysql hasn't worked well due to #2839.

[Mike Bayer]

pg is mostly in 9d952e0a11709fe35ada2635a79043ca

[Mike Bayer]

Removing milestone: 0.9.0 (automated comment)