// Using Stardog with the [Jena](http://jena.apache.org) API
// -------------------
// In this example we'll show how to use the Stardog Jena API bindings.
public static void main(String[] args) throws Exception {
// Creating a Server
// -----------------
// You'll need a server to connect to, obviously. For the example, lets create an embedded
// server.
Server aServer = Stardog.buildServer().bind(SNARLProtocolConstants.EMBEDDED_ADDRESS).start();
try {
// Next we'll establish a admin connection to Stardog so we can create a database to use for
// the example
AdminConnection aAdminConnection =
AdminConnectionConfiguration.toEmbeddedServer().credentials("admin", "admin").connect();
try {
// If the database already exists, we'll drop it and create a fresh copy
if (aAdminConnection.list().contains("testJena")) {
aAdminConnection.drop("testJena");
}
aAdminConnection.createMemory("testJena");
} finally {
aAdminConnection.close();
}
// Now we open a Connection our new database
Connection aConn =
ConnectionConfiguration.to("testJena").credentials("admin", "admin").connect();
// Then we obtain a Jena `Model` for the specified stardog database which is backed by our
// `Connection`
Model aModel = SDJenaFactory.createModel(aConn);
try {
// Start a transaction before adding the data. This is not required, but it is faster to
// group the entire add into a single transaction rather
// than rely on the auto commit of the underlying stardog connection.
aModel.begin();
// Read data into the model. note, this will add statement at a time. Bulk loading needs
// to be performed directly with the BulkUpdateHandler provided
// by the underlying graph, or read in files in RDF/XML format, which uses the bulk loader
// natively. Alternatively, you can load data into the stardog
// database using it's native API via the command line client.
aModel.getReader("N3").read(aModel, new FileInputStream("data/sp2b_10k.n3"), "");
// When you're done adding, you need to commit the changes
aModel.commit();
// Query that we will run against the data we just loaded
String aQueryString =
"select * where { ?s ?p ?o. filter(?s = <http://localhost/publications/articles/Journal1/1940/Article1>).}";
// Create a query...
Query aQuery = QueryFactory.create(aQueryString);
// ... and run it
QueryExecution aExec = QueryExecutionFactory.create(aQuery, aModel);
try {
// Now print the results
ResultSetFormatter.out(aExec.execSelect(), aModel);
} finally {
// Always close the execution
aExec.close();
}
} finally {
// close the model to free up the connection to the stardog database
aModel.close();
}
} finally {
// You must stop the server when you're done
aServer.stop();
}
}
/** @inheritDoc */
public void commit() throws DataSourceException {
mModel.commit();
}
