8.10 ORARDFLDR Utility for Bulk Loading RDF Data

This section describes using the ORARDFLDR utility program for bulk loading RDF data serialized in various standard formats such as RDF/XML, N-Triples, Turtle, JSON-LD, and so on.

The Java class oracle.rdf4j.adapter.utils.RDFLoader is included with Oracle Adapter for Eclipse RDF4J. It uses Eclipse RDF4J’s RDF parsers in combination with Oracle AI Database’s scalable bulk loading capabilities to parse and load RDF files into the database.

This utility program loads all files in a directory into an RDF graph in Oracle AI Database. It supports several RDF serializations like RDF/XML, Turtle, N-Triple, N-Quads, Trig, and JSON-LD. Files compressed with gzip can be directly loaded without uncompressing the gzip file. In addition, Unicode characters, special characters, and long literals (CLOBs) are handled automatically.

Running ORARDFLDR Utility Program

The following describes the commands to execute ORARDFLDR. The commands assume that all Oracle support for Eclipse RDF4J jars and required supporting jars are located in /tmp/oracle_adapter/jar as explained previously in Setup and Configuration for Using Oracle RDF Graph Adapter for Eclipse RDF4J.

• Usage:

  java -cp /tmp/oracle_adapter/jar/'*' oracle.rdf4j.adapter.utils.RDFLoader <command_line_arguments>

• For help details:

  java -cp /tmp/oracle_adapter/jar/'*' oracle.rdf4j.adapter.utils.RDFLoader --help

For convenience, a shell script in the bin directory can also be executed. Proper set up of the CLASSPATH environment variable is required for execution of this shell script. The following describes the prerequisites and the commands to use this script:

Prerequisite: Set the CLASSPATH environment variable and ensure the /bin directory of the kit is in your Unix PATH environment variable.

• Setup (assuming C shell command line interface):

  export CLASSPATH=/tmp/oracle_adapter/jar/'*'
  export PATH=/tmp/oracle_adapter/bin:$PATH

• Usage:

  orardfldr <command_line_arguments>

• For help details:

  orardfldr --help