oxigraph 0.1.0

a SPARQL database and RDF toolkit
Documentation

Oxigraph is a graph database implementing the SPARQL standard.

Its goal is to provide a compliant, safe and fast graph database.

It currently provides three store implementations providing SPARQL 1.1 query capability:

  • MemoryStore: a simple in memory implementation.
  • RocksDbStore: a file system implementation based on the RocksDB key-value store. It requires the "rocksdb" feature to be activated. The "rocksdb" requires the clang compiler to be installed.
  • SledStore: another file system implementation based on the Sled key-value store. It requires the "sled" feature to be activated. Sled is much faster to build than RockDB and does not require a C++ compiler. However, Sled is still in developpment, less tested and data load seems much slower than RocksDB.

It also provides a set of utility functions for reading, writing and processing RDF files.

Usage example with the MemoryStore:

use oxigraph::MemoryStore;
use oxigraph::model::*;
use oxigraph::sparql::{QueryOptions, QueryResults};

let store = MemoryStore::new();

// insertion
let ex = NamedNode::new("http://example.com")?;
let quad = Quad::new(ex.clone(), ex.clone(), ex.clone(), None);
store.insert(quad.clone());

// quad filter
let results: Vec<Quad> = store.quads_for_pattern(Some(ex.as_ref().into()), None, None, None).collect();
assert_eq!(vec![quad], results);

// SPARQL query
if let QueryResults::Solutions(mut solutions) =  store.query("SELECT ?s WHERE { ?s ?p ?o }", QueryOptions::default())? {
assert_eq!(solutions.next().unwrap()?.get("s"), Some(&ex.into()));
}
# Result::<_,Box<dyn std::error::Error>>::Ok(())