On Saturday, September 22, 2012 01:57:59 PM Paul Taylor wrote:
> Hello there again,
>
> I have a Jena model that is stored in an SDBStore backed by MySQL.
> I would like to know whether a particular Resource exists in the Model.
> I cannot use the model.getResource("uri") because according to javadoc
> this will always return a Resource since it will create a new one if it does
> not exist.
The only way a Resource "exists" in a model is to appear as the
subject, predicate, or object of some statement. getResource() will
create a new Jena resource object, but it doesn't tinker with the
statements in the model. Having got a Resource, call it R, you
can then see if it has any properties or whether it appears as the
object of any statement.
[Also model.containsResource(RDFNode n) should work, assuming that
SDB doesn't pessimise it.]
Chris
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