Struct PreparedDeleteInsertUpdate 

pub struct PreparedDeleteInsertUpdate<'a> { /* private fields */ }

A prepared SPARQL query.

Allows customizing things like the evaluation dataset and substituting variables.

Usage example:

use oxrdf::{Dataset, GraphName, Literal, NamedNode, Quad};
use spareval::{DeleteInsertQuad, QueryEvaluator};
use spargebra::{GraphUpdateOperation, SparqlParser};

let ex = NamedNode::new("http://example.com")?;
let dataset = Dataset::from_iter([Quad::new(
    ex.clone(),
    ex.clone(),
    Literal::from(0),
    GraphName::DefaultGraph,
)]);
let update = SparqlParser::new().parse_update(
    "DELETE { ?s ?p ?o } INSERT { ?s ?p ?o2 } WHERE { ?s ?p ?o BIND(?o +1 AS ?o2) }",
)?;
let GraphUpdateOperation::DeleteInsert {
    delete,
    insert,
    using: _,
    pattern,
} = &update.operations[0]
else {
    unreachable!()
};
let results = QueryEvaluator::new()
    .prepare_delete_insert(delete.clone(), insert.clone(), None, None, pattern)
    .execute(&dataset)?
    .collect::<Result<Vec<_>, _>>()?;
assert_eq!(
    results,
    vec![
        DeleteInsertQuad::Delete(Quad::new(
            ex.clone(),
            ex.clone(),
            Literal::from(0),
            GraphName::DefaultGraph,
        )),
        DeleteInsertQuad::Insert(Quad::new(
            ex.clone(),
            ex.clone(),
            Literal::from(1),
            GraphName::DefaultGraph,
        ))
    ]
);

Implementations

impl PreparedDeleteInsertUpdate<'_>

pub fn dataset(&self) -> &QueryDatasetSpecification

Returns the query dataset specification of this prepared update.

pub fn dataset_mut(&mut self) -> &mut QueryDatasetSpecification

Returns the query dataset specification of this prepared update.

pub fn execute<'b>( self, dataset: impl QueryableDataset<'b>, ) -> Result<DeleteInsertIter<'b>, QueryEvaluationError>

Execute the SPARQL query against the given QueryableDataset.

Trait Implementations

impl<'a> Clone for PreparedDeleteInsertUpdate<'a>

fn clone(&self) -> PreparedDeleteInsertUpdate<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.