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Proof-of-concept RDF in-memory quad store implementation using PDO and SQLite.

To install this library use Composer via:

composer require sweetrdf/in-memory-store-sqlite

UseInMemoryStoreSqlite::createInstance() to get a ready-to-use store instance (see example below).Sending SPARQL queries can be done viaquery method.Your data is stored inside an in-memory SQLite database file.After the script ends all your data inside the store will be gone.

Create a store instance, load a few triples into it and run a query.

usesweetrdf\InMemoryStoreSqlite\Store\InMemoryStoreSqlite;// get ready to use store instance$store = InMemoryStoreSqlite::createInstance();// send a SPARQL query which creates two triples$store->query('INSERT INTO <http://example.com/> {    <http://s> <http://p1> "baz" .    <http://s> <http://xmlns.com/foaf/0.1/name> "label1" .}');// send another SPARQL query asking for all triples$res =$store->query('SELECT * WHERE {?s ?p ?o.}');$triples =$res['result']['rows'];echo\count($triples);// outputs: 2// $triples contains result set, which consists of arrays and scalar values

Store supports a lot of SPARQL 1.0/1.1 features.For more information please readSPARQL-support.md.

Store uses an in-memory SQLite file configured with:

• PRAGMA synchronous = OFF
• PRAGMA journal_mode = OFF
• PRAGMA locking_mode = EXCLUSIVE
• PRAGMA page_size = 4096

CheckPDOSQLiteAdapter.php for more information.

When adding several hundred or more triples at once you may experience increased execution time.Local tests showed that per second around 1500 triples can be added.

This work is licensed under the terms of the GPL 2.

This work is based on the code of ARC2 fromhttps://github.com/semsol/arc2 (by Benjamin Nowak and contributors).To see what was extracted check pull request#1.ARC2 is dual licensed under the terms of GPL 2 (or later) as well as W3C Software License.