TDB NodeTable

[Laurent Pellegrino <la...@gmail.com>]

Hello,

Is it possible to retrieve the NodeTable associated to a TDB instance?
I have to query it (read-only),

Do I have to create a new one from the files representation? In that
case which class should I use (It seems they are a lot of NodeTable*
classes) and what are the parameters to pass?

Is there any difference between transactional and non-transactional
TDB instances to retrieve this NodeTable?

Kind Regards,

Laurent

Re: TDB NodeTable

[Andy Seaborne <an...@apache.org>]

On 02/07/12 16:00, Laurent Pellegrino wrote:
> Hello,
>
> Is it possible to retrieve the NodeTable associated to a TDB instance?
> I have to query it (read-only),
>
> Do I have to create a new one from the files representation?  In that
> case which class should I use (It seems they are a lot of NodeTable*
> classes) and what are the parameters to pass?
>
> Is there any difference between transactional and non-transactional
> TDB instances to retrieve this NodeTable?
>
> Kind Regards,
>
> Laurent
>

If you are just reading the files, with no TDB running:

See command tdb.tdbnode

If in java with TDB:

DatasetGraphTxn dsg = StoreConnection.make("DB").begin(ReadWrite.READ) ;
NodeTable x = dsg.getTripleTable().getNodeTupleTable().getNodeTable() ;

Iterator<Pair<NodeId, Node>> iter = x.all() ;
for ( ; iter.hasNext() ; )
   etc etc

dsg.end() ;

This is NOT all the nodes in the graph - you'll have to ask the graph 
for that (inlined nodes do not go in the node table).

Be careful.

	Andy