Hi Louis-David,
I also have written a forum application using PostgreSQL.
My schema has a "threadid" for each posting, which is actually also the
"messageid" of the first posting in the thread, but that is irrelevant.
I can then just select all messages belonging to that thread. The actual
hierarchy of messages (which posting is in response to which) is dealt
with by a "parentid", identifying the messageid of the post being
responded to. Sorting that out is done by the middleware (PHP in this
case) - the SQL query simply returns all messages in the thread in a
single query. Because our database is somewhat busy, I have opted to
keep the queries to the database simple and let the middleware sort
out the heirarchical structure (which it is quite good at).
I hope this helps.
Bob Edwards.
Louis-David Mitterrand wrote:
Hi,
To build a threaded forum application I came up the following schema:
forum
------
id_forum | integer| not null default nextval('forum_id_forum_seq'::regclass)
id_parent| integer|
subject | text | not null
message | text |
Each message a unique id_forum and an id_parent pointing to the replied
post (empty if first post).
How can I build an elegant query to select all messages in a thread?
Thanks,
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