Struct SelectQuery 

pub struct SelectQuery {
    pub select_vars: Vec<String>,
    pub where_clause: Vec<TriplePattern>,
    pub filters: Vec<String>,
    pub limit: Option<usize>,
    pub offset: Option<usize>,
    pub distinct: bool,
}

An inner SELECT query

Fields

select_vars: Vec<String>

Variables projected in the SELECT clause (empty = SELECT *)

where_clause: Vec<TriplePattern>

Triple patterns in the WHERE clause

filters: Vec<String>

FILTER expressions (as strings, evaluated by checking bindings)

limit: Option<usize>

LIMIT clause

offset: Option<usize>

OFFSET clause

distinct: bool

SELECT DISTINCT

Implementations

impl SelectQuery

pub fn new() -> Self

Create an empty SELECT query

pub fn select(self, vars: &[&str]) -> Self

Add projected variables

pub fn where_triple(self, s: &str, p: &str, o: &str) -> Self

Add a triple pattern to WHERE

pub fn filter(self, f: impl Into<String>) -> Self

Add a FILTER expression

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

Set LIMIT

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

Set OFFSET

pub fn distinct(self) -> Self

Enable DISTINCT

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.