Yes I'm using PostgreSQL and now that you've linked to the docs, I
remember there was a possibility for recursion. Thanks for suggestion,
I'll look into it.
.oO V Oo.
On 08/02/2011 03:41 AM, Gunnlaugur Briem wrote:
You could look for recursive CTE (Common Table Expressions), if your
database engine supports such queries. See e.g.
http://www.postgresql.org/docs/8.4/static/queries-with.html for
PostgreSQL. That allows arbitrary-depth queries, as opposed to join
chains that have to assume a fixed depth. You could probably apply two
recursive queries, one downward and one upward from the given node, to
avoid querying the whole tree.
SQLAlchemy has no support for CTEs directly, though of course you can
construct the query manually and execute and fetch results through
SQLAlchemy. You *can* get some support for recursive queries
under SQLAlchemy in https://github.com/marplatense/sqla_hierarchy/ but
be warned, that project is ... "youthful" :)
Regards,
- Gulli
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