Enum mentat_core::Binding

pub enum Binding {
    Scalar(TypedValue),
    Vec(ValueRc<Vec<Binding>>),
    Map(ValueRc<StructuredMap>),
}

The values bound in a query specification can be:

• Vecs of structured values, for multi-valued component attributes or nested expressions.
• Single structured values, for single-valued component attributes or nested expressions.
• Single typed values, for simple attributes.

The Binding enum defines these three options.

Datomic also supports structured inputs; at present Mentat does not, but this type would also serve that purpose.

Note that maps are not ordered, and so Binding is neither Ord nor PartialOrd.

Variants

Scalar(TypedValue)Vec(ValueRc<Vec<Binding>>)Map(ValueRc<StructuredMap>)

Methods

impl Binding

pub fn val(self) -> Option<TypedValue>

impl Binding

pub fn is_congruent_with<T: Into<Option<ValueType>>>(&self, t: T) -> bool

Returns true if the provided type is Some and matches this value's type, or if the provided type is None.

pub fn matches_type(&self, t: ValueType) -> bool

pub fn value_type(&self) -> Option<ValueType>

impl Binding

pub fn into_known_entid(self) -> Option<KnownEntid>

pub fn into_entid(self) -> Option<Entid>

pub fn into_kw(self) -> Option<ValueRc<Keyword>>

pub fn into_boolean(self) -> Option<bool>

pub fn into_long(self) -> Option<i64>

pub fn into_double(self) -> Option<f64>

pub fn into_instant(self) -> Option<DateTime<Utc>>

pub fn into_timestamp(self) -> Option<i64>

pub fn into_string(self) -> Option<ValueRc<String>>

pub fn into_uuid(self) -> Option<Uuid>

pub fn into_uuid_string(self) -> Option<String>

pub fn into_c_string(self) -> Option<*mut c_char>

pub fn into_kw_c_string(self) -> Option<*mut c_char>

pub fn into_uuid_c_string(self) -> Option<*mut c_char>

Trait Implementations

impl Clone for Binding

fn clone(&self) -> Binding

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Binding

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Eq for Binding

impl PartialEq for Binding

fn eq(&self, __arg_0: &Binding) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &Binding) -> bool

This method tests for !=.

impl<T> From<T> for Binding where     T: Into<TypedValue>,

fn from(value: T) -> Self

Performs the conversion.

impl From<StructuredMap> for Binding

fn from(value: StructuredMap) -> Self

Performs the conversion.

impl From<Vec<Binding>> for Binding

fn from(value: Vec<Binding>) -> Self

Performs the conversion.