pub struct IsNullable;
Expand description

Yes, this type can be null

The only diesel provided SqlType that uses this value is Nullable<T>

Trait Implementations§

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impl AllAreNullable<IsNullable> for IsNullable

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type Out = IsNullable

See the trait documentation
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impl AllAreNullable<IsNullable> for NotNull

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type Out = NotNull

See the trait documentation
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impl AllAreNullable<NotNull> for IsNullable

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type Out = NotNull

See the trait documentation
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impl Clone for IsNullable

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fn clone(&self) -> IsNullable

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for IsNullable

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

Formats the value using the given formatter. Read more
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impl<O> MaybeNullableType<O> for IsNullablewhere
O: SqlType,
Nullable<O>: TypedExpressionType,

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type Out = Nullable<O>

See the trait documentation
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impl OneIsNullable<IsNullable> for IsNullable

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type Out = IsNullable

See the trait documentation
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impl OneIsNullable<IsNullable> for NotNull

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type Out = IsNullable

See the trait documentation
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impl OneIsNullable<NotNull> for IsNullable

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type Out = IsNullable

See the trait documentation
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impl Copy for IsNullable

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere
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> Borrow<T> for Twhere
T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

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

const: unstable · source§

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source§

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> IntoSql for T

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fn into_sql<T>(self) -> AsExprOf<Self, T>where
Self: AsExpression<T> + Sized,
T: SqlType + TypedExpressionType,

Convert self to an expression for Diesel’s query builder. Read more
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fn as_sql<'a, T>(&'a self) -> AsExprOf<&'a Self, T>where
&'a Self: AsExpression<T>,
T: SqlType + TypedExpressionType,

Convert &self to an expression for Diesel’s query builder. Read more
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impl<T> ToOwned for Twhere
T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere
U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

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 Twhere
U: TryFrom<T>,

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

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for Twhere
V: MultiLane<T>,

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fn vzip(self) -> V