Re: How to store directory like structures? - Mailing list pgsql-sql

From PFC
Subject Re: How to store directory like structures?
Date
Msg-id op.son4qhnvth1vuj@localhost
Whole thread Raw
In response to How to store directory like structures?  (Axel Straschil <axel@straschil.com>)
List pgsql-sql
    Use the ltree datatype !It's made specifically for this purpose.http://www.sai.msu.su/~megera/postgres/gist/

On Sun, 03 Apr 2005 12:13:48 +0200, Axel Straschil <axel@straschil.com>  
wrote:

> Hello!
>
> I want to store some structure like:
>
> CREATE TABLE node
> (
>     nodeid    SERIAL PRIMARY KEY,
>     parent    INT REFERENCES node(nodeid)
>             ON UPDATE CASCADE ON DELETE CASCADE,
>     label    TEXT,
>     UNIQUE (parent, label),
>     ...
>     data
>     ...
> );
>
> The label is used to map a node to a directory like strukture, so i can
> have a function directory_for(nodeid) which gives me
> /root_label/parent_label/parent_label/my_label (root labels have NULL as  
> parent)
>
> The problem is the ammount of queries when i've got deep nodes, and I
> often have to query if a node is "in path" of another node.
>
> Is there a good solution to build directory-tree like datastruktures?
> I found, http://www.sai.msu.su/~megera/postgres/gist/ltree/ which seems
> to do what i want, but I've no idea (and probalbly no chance) to get
> that running on my system ;-(
>
> Thanks,
> AXEL.
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 3: if posting/reading through Usenet, please send an appropriate
>       subscribe-nomail command to majordomo@postgresql.org so that your
>       message can get through to the mailing list cleanly
>




pgsql-sql by date:

Previous
From: Axel Straschil
Date:
Subject: Re: How to store directory like structures?
Next
From: PFC
Date:
Subject: Re: How to store directory like structures?