Enum Query

pub enum Query {
    Select {
        dataset: Option<QueryDataset>,
        pattern: GraphPattern,
        base_iri: Option<Iri<String>>,
    },
    Construct {
        template: Vec<TriplePattern>,
        dataset: Option<QueryDataset>,
        pattern: GraphPattern,
        base_iri: Option<Iri<String>>,
    },
    Describe {
        dataset: Option<QueryDataset>,
        pattern: GraphPattern,
        base_iri: Option<Iri<String>>,
    },
    Ask {
        dataset: Option<QueryDataset>,
        pattern: GraphPattern,
        base_iri: Option<Iri<String>>,
    },
}

A parsed SPARQL query.

use spargebra::Query;

let query_str = "SELECT ?s ?p ?o WHERE { ?s ?p ?o . }";
let query = Query::parse(query_str, None)?;
assert_eq!(query.to_string(), query_str);
assert_eq!(
    query.to_sse(),
    "(project (?s ?p ?o) (bgp (triple ?s ?p ?o)))"
);

Variants

Select

SELECT.

Fields

dataset: Option<QueryDataset>

The query dataset specification.

pattern: GraphPattern

The query selection graph pattern.

base_iri: Option<Iri<String>>

The query base IRI.

Construct

CONSTRUCT.

Fields

template: Vec<TriplePattern>

The query construction template.

dataset: Option<QueryDataset>

The query dataset specification.

pattern: GraphPattern

The query selection graph pattern.

base_iri: Option<Iri<String>>

The query base IRI.

Describe

DESCRIBE.

Fields

dataset: Option<QueryDataset>

The query dataset specification.

pattern: GraphPattern

The query selection graph pattern.

base_iri: Option<Iri<String>>

The query base IRI.

Ask

ASK.

Fields

dataset: Option<QueryDataset>

The query dataset specification.

pattern: GraphPattern

The query selection graph pattern.

base_iri: Option<Iri<String>>

The query base IRI.

Implementations

impl Query

pub fn parse( query: &str, base_iri: Option<&str>, ) -> Result<Self, SparqlSyntaxError>

Parses a SPARQL query with an optional base IRI to resolve relative IRIs in the query.

pub fn dataset(&self) -> Option<&QueryDataset>

pub fn dataset_mut(&mut self) -> Option<&mut QueryDataset>

pub fn base_iri(&self) -> Option<&Iri<String>>

pub fn to_sse(&self) -> String

Formats using the SPARQL S-Expression syntax.

Trait Implementations

impl Clone for Query

fn clone(&self) -> Query

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Query

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for Query

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl FromStr for Query

type Err = SparqlSyntaxError

The associated error which can be returned from parsing.

fn from_str(query: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for Query

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Query

fn eq(&self, other: &Query) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl TryFrom<&String> for Query

type Error = SparqlSyntaxError

The type returned in the event of a conversion error.

fn try_from(query: &String) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<&str> for Query

type Error = SparqlSyntaxError

The type returned in the event of a conversion error.

fn try_from(query: &str) -> Result<Self, Self::Error>

Performs the conversion.

impl Eq for Query

impl StructuralPartialEq for Query