Struct SqlDataset 

pub struct SqlDataset<'a, B: SyncBackend> { /* private fields */ }

A spareval dataset over a SQL backend.

Implementations

impl<'a, B: SyncBackend> SqlDataset<'a, B>

pub fn new(backend: &'a B) -> Self

pub fn with_options(self, options: &QueryOptions) -> Result<Self>

Reads entailed triples, as the SQL compiler does for these options.

pub fn lookup(&self, id: i64) -> Result<Term>

Trait Implementations

impl<'a, B: SyncBackend> QueryableDataset<'a> for SqlDataset<'a, B>

type InternalTerm = i64

Internal representation of an RDF term

type Error = Error

Error returned by the dataset.

fn internal_quads_for_pattern( &self, subject: Option<&i64>, predicate: Option<&i64>, object: Option<&i64>, graph_name: Option<Option<&i64>>, ) -> impl Iterator<Item = Result<InternalQuad<i64>>> + use<'a, B>

Fetches quads according to a pattern

fn internal_named_graphs( &self, ) -> impl Iterator<Item = Result<i64>> + use<'a, B>

Fetches the list of dataset named graphs

fn contains_internal_graph_name(&self, graph_name: &i64) -> Result<bool>

Returns if the dataset contains a given named graph

fn internalize_term(&self, term: Term) -> Result<i64>

Builds an internal term from the Term struct

fn externalize_term(&self, term: i64) -> Result<Term>

Builds a Term from an internal term

fn externalize_expression_term( &self, term: Self::InternalTerm, ) -> Result<ExpressionTerm, Self::Error>

Builds an ExpressionTerm from an internal term

fn internalize_expression_term( &self, term: ExpressionTerm, ) -> Result<Self::InternalTerm, Self::Error>

Builds an internal term from an ExpressionTerm

fn internal_term_effective_boolean_value( &self, term: Self::InternalTerm, ) -> Result<Option<bool>, Self::Error>

Computes the term Effective boolean value