Struct SelectQuery 

pub struct SelectQuery {
    pub prefixes: Vec<(String, String)>,
    pub projection: Vec<String>,
    pub distinct: bool,
    pub reduced: bool,
    pub where_clause: WhereClause,
    pub order_by: Vec<OrderDirection>,
    pub group_by: Vec<String>,
    pub having: Option<SparqlFilter>,
    pub limit: Option<usize>,
    pub offset: Option<usize>,
}

A fluent builder for SPARQL SELECT queries.

Fields

prefixes: Vec<(String, String)>

PREFIX declarations: (prefix, iri).

projection: Vec<String>

Variables to project. Empty means SELECT *.

distinct: bool

Whether to apply DISTINCT.

reduced: bool

Whether to apply REDUCED.

where_clause: WhereClause

The WHERE clause.

order_by: Vec<OrderDirection>

ORDER BY terms.

group_by: Vec<String>

GROUP BY variables.

having: Option<SparqlFilter>

HAVING filter (only meaningful when GROUP BY is set).

limit: Option<usize>

LIMIT value.

offset: Option<usize>

OFFSET value.

Implementations

impl SelectQuery

pub fn new() -> Self

Create a new, empty SELECT query builder.

pub fn prefix(self, prefix: impl Into<String>, iri: impl Into<String>) -> Self

Add a PREFIX declaration.

pub fn select(self, var: impl Into<String>) -> Self

Add a variable to the SELECT projection.

pub fn select_all(self) -> Self

Set projection to SELECT *.

pub fn distinct(self) -> Self

Add DISTINCT to the query.

pub fn reduced(self) -> Self

Add REDUCED to the query.

pub fn where_clause(self, clause: WhereClause) -> Self

Set the WHERE clause.

pub fn order_by_asc(self, var: impl Into<String>) -> Self

Add an ORDER BY ASC(?var) term.

pub fn order_by_desc(self, var: impl Into<String>) -> Self

Add an ORDER BY DESC(?var) term.

pub fn group_by(self, var: impl Into<String>) -> Self

Add a GROUP BY variable.

pub fn having(self, filter: SparqlFilter) -> Self

Set the HAVING filter.

pub fn limit(self, n: usize) -> Self

Set the LIMIT.

pub fn offset(self, n: usize) -> Self

Set the OFFSET.

pub fn build(&self) -> Result<String, SparqlBuilderError>

Build the SPARQL query string, performing validation first.

pub fn build_unchecked(&self) -> String

Build the SPARQL query string without validation.

Trait Implementations

impl Clone for SelectQuery

fn clone(&self) -> SelectQuery

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SelectQuery

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

Formats the value using the given formatter.

impl Default for SelectQuery

fn default() -> Self

Returns the “default value” for a type.