Crate sophia_sparql_client 

A client implementation of the SPARQL1.1 protocol based on Sophia. It implements sophia_api::sparql::SparqlDataset.

Example:

use sophia_api::sparql::{SparqlDataset, SparqlResult};
use sophia_api::term::Term;
use sophia_sparql_client::SparqlClient;

let cli = SparqlClient::new("https://query.wikidata.org/bigdata/namespace/wdq/sparql");
let query = r#"
    #All Dr. Who performers
    SELECT ?doctor ?doctorLabel ?ordinal ?performer ?performerLabel
    WHERE {
      ?doctor p:P31 ?type. ?type ps:P31 wd:Q47543030 .
      OPTIONAL { ?type pq:P1545 ?ordinal } OPTIONAL { ?doctor wdt:P1545 ?ordinal }
      OPTIONAL { ?doctor p:P175 / ps:P175 ?performer }
      SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }
    }
    ORDER BY ASC(xsd:integer(?ordinal) )
"#;
if let SparqlResult::Bindings(bindings) = cli.query(query)? {
    for b in bindings {
        let b = b?;
        let doctor_label = b[1].as_ref().and_then(|t| t.lexical_form()).unwrap();
        let performer_label = b[4].as_ref().and_then(|t| t.lexical_form()).unwrap_or("NULL".into());
        println!("{}\t{}", doctor_label, performer_label);
    }
}

Structs

Bindings

The result of a SELECT query as returned by SparqlClient.

Query

A SPARQL query prepared for a SparqlClient.

SparqlClient

A SPARQL 1.1 client implementing SparqlDataset.

Enums

Error

Error type produced by SparqlClient.