Enum AbstractQuery 

pub enum AbstractQuery<K, V> {
    And(Vec<Self>),
    Or(Vec<Self>),
    Not(Box<Self>),
    Eq(K, V),
    Neq(K, V),
    Gt(K, V),
    Gte(K, V),
    Lt(K, V),
    Lte(K, V),
    Like(K, V),
    In(K, Vec<V>),
    Exist(Vec<K>),
}

An abstract query representation over a key and value type

Variants

And(Vec<Self>)

Logical AND of multiple clauses

Or(Vec<Self>)

Logical OR of multiple clauses

Not(Box<Self>)

Negation of a clause

Eq(K, V)

Equality comparison for a field value

Neq(K, V)

Inequality comparison for a field value

Gt(K, V)

Greater-than comparison for a field value

Gte(K, V)

Greater-than-or-equal comparison for a field value

Lt(K, V)

Less-than comparison for a field value

Lte(K, V)

Less-than-or-equal comparison for a field value

Like(K, V)

SQL ‘LIKE’-compatible string comparison for a field value

In(K, Vec<V>)

Match one of multiple field values in a set

Exist(Vec<K>)

Match any non-null field value of the given field names

Implementations

impl<K, V> AbstractQuery<K, V>

pub fn optimise(self) -> Option<Self>

Perform basic query clause optimization

pub fn map_names<RK, E>( self, f: impl FnMut(K) -> Result<RK, E>, ) -> Result<AbstractQuery<RK, V>, E>

Perform a transformation on all field names in query clauses

pub fn map_values<RV, E>( self, f: impl FnMut(&K, V) -> Result<RV, E>, ) -> Result<AbstractQuery<K, RV>, E>

Perform a transformation on all field values in query clauses

pub fn map<RK, RV, KF, VF, E>( self, kf: &mut KF, vf: &mut VF, ) -> Result<AbstractQuery<RK, RV>, E>

where KF: FnMut(K) -> Result<RK, E>, VF: FnMut(&K, V) -> Result<RV, E>,

Transform all query clauses using field name and value conversions

Trait Implementations

impl<K: Clone, V: Clone> Clone for AbstractQuery<K, V>

fn clone(&self) -> AbstractQuery<K, V>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<K: Debug, V: Debug> Debug for AbstractQuery<K, V>

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

Formats the value using the given formatter.

impl<K, V> Default for AbstractQuery<K, V>

fn default() -> Self

Returns the “default value” for a type.

impl<K: Hash, V: Hash> Hash for AbstractQuery<K, V>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<K: Ord, V: Ord> Ord for AbstractQuery<K, V>

fn cmp(&self, other: &AbstractQuery<K, V>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<K: PartialEq, V: PartialEq> PartialEq for AbstractQuery<K, V>

fn eq(&self, other: &AbstractQuery<K, V>) -> 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<K: PartialOrd, V: PartialOrd> PartialOrd for AbstractQuery<K, V>

fn partial_cmp(&self, other: &AbstractQuery<K, V>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<K, V> Serialize for AbstractQuery<K, V>

where for<'a> &'a K: Into<String>, V: Serialize,

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl<K: Eq, V: Eq> Eq for AbstractQuery<K, V>

impl<K, V> StructuralPartialEq for AbstractQuery<K, V>