On 08/05/14 07:21, Karen Menz wrote:
Hi,
I'm trying to get Lucene working with TDB,
but no luck so far.
I already
have a TDB dataset saved in "tdb_directory" folder, with the following
platform:
Jena-2.11.1
Lucene-4.8.0 (Apache)
Java-1.7.0,
64-Bit
And I have
the following code:
Dataset ds1 = TDBFactory.createDataset(tdb_directory);
EntityDefinition entDef = new
EntityDefinition("uri", "text", RDFS.label.asNode());
File indexDir = new File(index_directory);
try{
dir
= FSDirectory.open(indexDir);
} catch(IOException e) {
e.printStackTrace();
}
Dataset ds = TextDatasetFactory.createLucene(ds1,
dir, entDef);
Then, when I execute the query as
following:
ds.begin(ReadWrite.READ);
Model model = ds.getDefaultModel();
Query q = QueryFactory.create(pre + "\n"
+ qs);
What's 'qs'?
QueryExecution qexec =
QueryExecutionFactory.create(q, ds);
QueryExecUtils.executeQuery(q,
qexec);
ds.commit();
ds.end();
I get an empty table
-------------
| s | label |
=============
and in the index_directory, only 3
file were created; segments.gen, segments_1, and write.lock, with sizes 1kb,
1kb, 0kb, respectively.
I'm not sure what I'm missing here,
and really appreciate any help.
looks like the data isn't indexed. It does not happen automatically
just by atatching and index to an existing, preloaded dataset.
Either have the index attached to the dataset when you loaded the data
or build the dataset in two steps:
http://jena.apache.org/documentation/query/text-query.html#building-a-text-index
There is a textindexer to run from the command line for indexing
existing data.
Andy
Thanks in advance.
Karen
