[Routing] Questions concerning Routing

[Marcus Wolschon]

On 2009-08-04, ibrahim_bouchrika at hotmail.com
<ibrahim_bouchrika at hotmail.com> wrote:
> The osmosis library seems to contain some classes to connect with the
> postgresql database.

Yes but only for bulk-reading and bulk-writing.
Not for searching for and accessing individual elements.

> The javadoc i used is located here:
> http://travelingsales.sourceforge.net/javadoc/libosm/

That one is completely outdated.
I need to repair the script that uploaded the javadoc
some time.

> I could also just use JDBC to connect and send out queries, but I noticed
> that the libosm library contains some methods that are transparent to the
> user to work with Nodes. (in other words the queries do not need to be
> writtenn which is a great timesaver for the routing part)
> So i think it would be better to use the libosm's pgsql classes instead of
> just jdbc.

LibOSM contain no current IDataSet -implementation for Postgres.
Your are however free to write one. E.g. based on the H2DataSet.

> Could you provide me with better documentation of how these classes work (if
> better documentation is available) or a clear example of how the connection
> is made using this library?

Look at H2DataSet and MysqlDataSet to see how to connect
to a database. Node, Way, Relation, Entity,... are just data-objects.
IDataSet is where it gets interesting.
There is lots of doumentation on it in the wiki:
http://travelingsales.sourceforge.net/
Looking at the "Plugins"-page and then "IDataSet" can get you started.

PS:
There are no unaproved posts in the forum.
I´m checking it (nearly) every day.