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NullIf

qraft::expression

Struct NullIf 

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pub struct NullIf<L, R> { /* private fields */ }
Expand description

Emits nullif(left, right).

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impl<'e, L, R> AsExpression<<L as Expression>::Type> for NullIf<L, R>
where L: Expression, R: LowerCompatible<<L as Expression>::Type>,

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type Expression<'s> = &'s NullIf<L, R> where NullIf<L, R>: 's

Concrete expression type returned for a borrowed value.
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fn as_expression<'s>( &'s self, ) -> <NullIf<L, R> as AsExpression<<L as Expression>::Type>>::Expression<'s>

Borrows self as a typed expression.
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impl<L, R> Expression for NullIf<L, R>
where L: Expression, R: LowerCompatible<<L as Expression>::Type>,

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type Type = <L as Expression>::Type

SQL type produced by this expression.
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fn lower(&self, ctx: &mut LowerCtx<'_>) -> usize

Appends the expression to the lowering context and returns its subtree size.

Auto Trait Implementations§

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impl<L, R> Freeze for NullIf<L, R>
where L: Freeze, R: Freeze,

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impl<L, R> RefUnwindSafe for NullIf<L, R>
where L: RefUnwindSafe, R: RefUnwindSafe,

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impl<L, R> Send for NullIf<L, R>
where L: Send, R: Send,

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impl<L, R> Sync for NullIf<L, R>
where L: Sync, R: Sync,

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impl<L, R> Unpin for NullIf<L, R>
where L: Unpin, R: Unpin,

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impl<L, R> UnsafeUnpin for NullIf<L, R>
where L: UnsafeUnpin, R: UnsafeUnpin,

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impl<L, R> UnwindSafe for NullIf<L, R>
where L: UnwindSafe, R: UnwindSafe,

Blanket Implementations§

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impl<T> Alias for T
where T: LowerProject,

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fn alias(self, alias: &'static str) -> Aliased<Self>
where Self: Sized,

Returns the same value tagged with the provided alias.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T, V> BetweenExt<T> for V
where T: Orderable, V: Expression<Type = T>,

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fn between<L, H>(self, low: L, high: H) -> Between<Self, L, H>
where L: LowerCompatible<T>, H: LowerCompatible<T>,

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fn not_between<L, H>(self, low: L, high: H) -> Between<Self, L, H>
where L: LowerCompatible<T>, H: LowerCompatible<T>,

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<E> DateExt for E
where E: Expression<Type = Date>,

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fn year(self) -> YearExtract<Self, DateSource>

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fn month(self) -> MonthExtract<Self, DateSource>

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fn day(self) -> DayExtract<Self, DateSource>

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impl<E> DateRelativeExt for E
where E: Expression<Type = Date>,

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fn past(self) -> Binary<Lt, Self, CurrentDate>

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fn future(self) -> Binary<Gt, Self, CurrentDate>

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fn today(self) -> Binary<Eq, Self, CurrentDate>

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fn before_today(self) -> Binary<Lt, Self, CurrentDate>

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fn after_today(self) -> Binary<Gt, Self, CurrentDate>

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impl<T, V> EqExt<T> for V
where T: Comparable, V: Expression<Type = T>,

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fn eq<E>(self, other: E) -> Binary<Eq, Self, E>
where E: LowerCompatible<T>,

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fn neq<E>(self, other: E) -> Binary<Neq, Self, E>
where E: LowerCompatible<T>,

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<E> In for E
where E: Expression,

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fn one_of<R>(self, list: R) -> InList<Self, R>
where R: LowerIn<Self::Type>,

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fn in_<R>(self, list: R) -> InList<Self, R>
where R: LowerIn<Self::Type>,

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fn not_in<R>(self, list: R) -> InList<Self, R>
where R: LowerIn<Self::Type>,

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, V> IsNull<T> for V
where T: Comparable, V: Expression<Type = Nullable<T>>,

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fn is_null(self) -> Postfix<Self>

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fn is_not_null(self) -> Postfix<Self>

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impl<T, V> IsPredicate<T> for V
where T: Boolean, V: Expression<Type = T>,

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fn is_true(self) -> Postfix<Self>

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fn is_false(self) -> Postfix<Self>

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impl<T, V> LikeExt<T> for V
where T: Likeable, V: Expression<Type = T>,

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fn like<E>(self, other: E) -> Like<Self, E>
where E: LowerCompatible<T>,

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fn not_like<E>(self, other: E) -> Like<Self, E>
where E: LowerCompatible<T>,

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impl<E> LowerAggregate for E
where E: Expression,

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fn lower_aggregate(self, ctx: &mut LowerCtx<'_>)

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impl<E> LowerCount for E
where E: LowerAggregate,

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fn lower_count(self, ctx: &mut LowerCtx<'_>)

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impl<E> LowerGroupBy for E
where E: Expression,

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fn lower_group_by(self, ctx: &mut LowerCtx<'_>)

Appends the grouping node or nodes to the lowering context.
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impl<E> LowerOrderBy for E
where E: Expression,

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fn lower_order_by(self, ctx: &mut LowerCtx<'_>)

Appends the ordering node or nodes to the lowering context.
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impl<E> LowerProject for E
where E: Expression,

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fn lower_project(self, ctx: &mut LowerCtx<'_>)

Appends the projection to the lowering context.
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impl<E> Order for E
where E: LowerOrderBy,

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fn asc(self) -> OrderNode<E>

Marks the value as ascending.
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fn desc(self) -> OrderNode<E>

Marks the value as descending.
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impl<T, V> OrderExt<T> for V
where T: Orderable, V: Expression<Type = T>,

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fn lt<E>(self, other: E) -> Binary<Lt, Self, E>
where E: LowerCompatible<T>,

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fn lte<E>(self, other: E) -> Binary<Lte, Self, E>
where E: LowerCompatible<T>,

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fn gt<E>(self, other: E) -> Binary<Gt, Self, E>
where E: LowerCompatible<T>,

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fn gte<E>(self, other: E) -> Binary<Gte, Self, E>
where E: LowerCompatible<T>,

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impl<T, V> PredicateExt<T> for V
where T: Boolean, V: Expression<Type = T>,

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fn and<E>(self, other: E) -> Binary<And, Self, E>
where E: LowerCompatible<T>,

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fn or<E>(self, other: E) -> Binary<Or, Self, E>
where E: LowerCompatible<T>,

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impl<Key> RelationForeignKey<Key> for Key

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fn from_relation_key(key: Key) -> Key

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impl<Key, T> RelationForeignKeyRef<Key> for T
where Key: Clone, T: RelationForeignKey<Key>,

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fn from_relation_key_ref(key: &Key) -> T

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impl<E> TimestampExt for E
where E: Expression<Type = Timestamp>,

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fn date(self) -> DateExtract<Self>

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fn time(self) -> TimeExtract<Self>

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fn year(self) -> YearExtract<Self, TimestampSource>

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fn month(self) -> MonthExtract<Self, TimestampSource>

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fn day(self) -> DayExtract<Self, TimestampSource>

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impl<E> TimestampRelativeExt for E
where E: Expression<Type = Timestamp>,

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fn past(self) -> Binary<Lt, Self, Now>

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fn future(self) -> Binary<Gt, Self, Now>

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fn today(self) -> Binary<Eq, DateExtract<Self>, CurrentDate>

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fn before_today(self) -> Binary<Lt, DateExtract<Self>, CurrentDate>

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fn after_today(self) -> Binary<Gt, DateExtract<Self>, CurrentDate>

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.