Struct Query 

pub struct Query {
    pub patterns: Vec<QueryPattern>,
    pub filters: Vec<QueryFilter>,
    pub select: Vec<String>,
    pub limit: Option<usize>,
    pub offset: Option<usize>,
    pub order_by: Option<OrderBy>,
}

A query against the knowledge base

Fields

patterns: Vec<QueryPattern>

Pattern to match

filters: Vec<QueryFilter>

Filter conditions

select: Vec<String>

Variables to return

limit: Option<usize>

Maximum results

offset: Option<usize>

Results offset

order_by: Option<OrderBy>

Order by

Implementations

impl Query

pub fn new() -> Self

pub fn pattern( self, subject: QueryTerm, predicate: &str, object: QueryTerm, ) -> Self

Add a triple pattern to match

pub fn filter(self, filter: QueryFilter) -> Self

Add a filter condition

pub fn select_vars(self, vars: Vec<&str>) -> Self

Specify which variables to return

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

Limit the number of results

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

Skip first N results

pub fn order_by(self, var: &str, ascending: bool) -> Self

Order results

Trait Implementations

impl Clone for Query

fn clone(&self) -> Query

Returns a duplicate 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 Default for Query

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Query

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Query

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.