Bulk removal of triples

[Tze-John Tang]

Is there a good way to programatically remove a set of triples? As I am updating records in the store, I am removing all triples for a given subject, and then adding new ones later. In my code, I am doing:

 Iterator<Resource> personIterator = GraphUtil.getSubjectIterator(newGraph, RDF.TYPE, IInfrastructureSchema.personType);
 while (personIterator.hasNext()) {
 Resource personResource = personIterator.next();
 logger.info("Removing {}", personResource);
 conn.remove().statements(personResource, null, null, adContextUri);
 }

In the newGraph, I have built up a graph of new triples that will be added. But before there are added, I want to remove all of the existing triples where the subject is in the newGraph. I want to remove a whole set of triples based on the subject.

[Mike Grove]

You could do that entire code snippet with a single SPARQL update query which would be a bit more succinct, but as Evren mention, update queries are run in their own transaction, so if you wanted those changes to be a part of a larger transaction, this type of programmatic approach is better.

You might also check out the Getter [1] API as a convenient way to grab triples out of the database.  We also provide some convenience classes around the Sesame API; some are on Github [2] and some are in Stardog in the com.complexible.common.openrdf namespace.

Cheers,

Mike

[1] http://docs.stardog.com/java/snarl/com/complexible/stardog/api/Getter.html

[2] http://mhgrove.github.io/cp-openrdf-utils/javadocs/1.2/

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