Laura Morales kirjoitti 01.11.2017 klo 08:59:
For querying I use the Jena query engine. I have created a module called
HDTQuery located http://download.systemsbiology.nl/sapp/ which is a simple
program and under development that should be able to use the full power of
SPARQL and be more advanced than grep… ;)
Does this tool allow to query HDT files from command-line, with SPARQL, and
without the need to setup a Fuseki endpoint?
There is also a command line tool called hdtsparql in the hdt-java
distribution that allows exactly this. It used to support only SELECT
queries, but I've enhanced it to support CONSTRUCT, DESCRIBE and ASK
queries too. There are some limitations, for example only CSV output is
supported for SELECT and N-Triples for CONSTRUCT and DESCRIBE. But it
works fine, at least for my use cases, and is often more convenient than
firing up Fuseki-HDT. It requires both the hdt file and the
corresponding index file.
Code here:
https://github.com/rdfhdt/hdt-java/blob/master/hdt-jena/src/main/java/org/rdfhdt/hdtjena/cmd/HDTSparql.java
The tool is in the hdt-jena package (not hdt-java-cli where the other
command line tools reside), since it uses parts of Jena (e.g. ARQ).
There is a wrapper script called hdtsparql.sh for executing it with the
proper Java environment.
Typical usage (example from hdt-java README):
# Execute SPARQL Query against the file.
$ ./hdtsparql.sh ../hdt-java/data/test.hdt "SELECT ?s ?p ?o WHERE { ?s
?p ?o . }"
-Osma
--
Osma Suominen
D.Sc. (Tech), Information Systems Specialist
National Library of Finland
P.O. Box 26 (Kaikukatu 4)
00014 HELSINGIN YLIOPISTO
Tel. +358 50 3199529
osma.suomi...@helsinki.fi
http://www.nationallibrary.fi
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