Struct Query 

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

A query for the knowledge base

Fields

select: Vec<String>

SELECT clause - variables to return

patterns: Vec<QueryPattern>

WHERE clause - patterns to match

filters: Vec<FilterExpr>

FILTER clause - filter expressions

limit: Option<usize>

LIMIT - maximum results

offset: Option<usize>

OFFSET - skip first N results

Implementations

impl Query

pub fn new() -> Self

Create a new query

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

Add a SELECT variable

pub fn where_pattern(self, pattern: QueryPattern) -> Self

Add a WHERE pattern

pub fn filter(self, expr: FilterExpr) -> Self

Add a FILTER expression

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

Set LIMIT

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

Set OFFSET

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 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 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.

impl StructuralPartialEq for Query