On 17/05/14 14:27, Karen Menz wrote:
Thanks Harkishan & Andy for your help, it works fine now.
However, I wonder if there's a way to build the index in java code, instead of
the command line.
You can call the command line programme from java (you can call any java
.main from java) if you want to index an already loaded dataset or just
read data into a dataset with text index attached.
Andy
Thanks,
Karen
On Friday, May 16, 2014 8:46 PM, Andy Seaborne <[email protected]> wrote:
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
