Thanks for the information Andy. Currently we are using jena-2.8.8 Can you also please share some documentation on how can we use Fuseki with TDB and interface RDFConnection?
Regards, Ashwani On 06/01/20, 4:29 PM, "Andy Seaborne" <[email protected]> wrote: On 06/01/2020 05:50, Ashwani Rathi wrote: > Hi All, > We have the following method where we are using Jena 2 Which version of jena 2 exactly? , where we are trying to fetch/ create Model object from ModelRDB utility method using com.hp.hpl.jena.db.IDBConnection > private Model getModelFromRDFStore(String modelName, IDBConnection conn) > { > Model model = null; > if (!conn.containsModel(modelName)) { > model = ModelRDB.createModel(conn, modelName); > } > else { > model = ModelRDB.open(conn, modelName); > } > > return model; > } > > com.hp.hpl.jena.db.IDBConnection basically encapsulates a JDBC connection. > > Now support for com.hp.hpl.jena.db.IDBConnection and corresponding implementing classes has been removed from Jena 3. > This is the functionality which we are trying to replicate in Jena 3. See prvious reply - it depends on what the application is trying to do, and what sort fo reliability of data it requires. For just a local data base, use TDB. Note: all storage in jena3 is based on "Datasets", not "Models". Use the default model of a dataset for a single RDF graph in a database. For a database on a remote server shared between several instances of your application, use Fuseki with TDB and interface RDFConnection. > > So can you please guide how can we achieve this functionality in Jena 3 using TDB or something else? Dataset dataset = TDB2Factory.connectDataset("some directory"); dataset.getDefaultModel(); but also all access to the database needs to be in a dataset transaction See Txn and the documentation https://urldefense.proofpoint.com/v2/url?u=https-3A__jena.apache.org_documentation_txn_&d=DwIDaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=ld8gXdwUlVansMT0flGoGNN0AOkhQba_hAJM5PewJCA&m=CThVIE5cplymnNcjUUNuq_4CFBNj8BUjRg3PWigMKAE&s=lEE_JneU-vmNLseoh-8pF4OwY1uoaD2EZetxHezQnSs&e= Andy > > Regards, > Ashwani > > On 06/01/20, 3:55 AM, "Andy Seaborne" <[email protected]> wrote: > > > > On 05/01/2020 09:15, Ashwani Rathi wrote: > > Hi, > > > > We are upgrading from jena 2 to jena 3 in our project. > > > > While jena used to have the following two classes in jena.jar: > > com.hp.hpl.jena.db.DBConnection > > com.hp.hpl.jena.db.IDBConnection > > That is the very old RDB layer; I am no sure it was ever released as > Apache Jena release. Which version of Jena do you have? 2.6.4 or earlier? > > > there are no such classes in jena 3 > > There have been a lot of changes, including going from RDF 1.0 to RDF 1.1. > > > We are using these classes in our project. > > > > Can someone guide me or provide a prototype on what claaes in jena 3 can be used to provide functionality for these missing classes? > > The current persistent storage options are TDB (TDB1, and TDB2). These > are custom RDF storage systems. They scale better, load faster, run > faster and are more robust than RDB. There is a SQL-backed storage > system as well but we don't recommend it for any new work - and it is > not compatible in any way with RDB. > > But if, as I suspect, this is a big version jump, maybe the place to > start is describing what use of RDF is made by your project? Is it > using the Model API? Some early SPARQL? > > Andy > > > Regards, > > > > Ashwani > > > > > > >
