Structures

Most of data structures handled by SPARQLer actually extend those from EasyRDF, to provide some extra ability.

Graph

Usually returned by doCostruct() function, contains multiple Resources. Extends the EasyRdf\Graph class and:

implements the Iterator inteface, so to be iterable in a loop

all properties added, removed or changed in child Resources are intercepted, stored in an internal structure, and can be saved back to the database using the commit() method

$graph = $client->doConstruct()->where('rdf:search', 'foobar')->get();

foreach($graph as $resource) {
    $resource->set('rdf:predicate', 'value');
}

$graph->commit();

Resource

Extends the EasyRdf\Resource class and adds a few features:

all changes are internally recorded to permit the commit() of the parent Graph
the p() method is a convenient shortcut for get() converting all Literal to their plain, scalar value.

the remove() method permits to delete the whole Resource from the database (not only the properties actually loaded)

$graph = $client->doConstruct()->where('rdf:search', 'foobar')->get();

foreach($graph as $resource) {
    if ($resource->p('rdf:predicate') == 'value') {
        $resource->remove();
    }
}