Struct Nullable

Source

pub struct Nullable<T>(/* private fields */);

Expand description

Wraps a base SQL type as nullable. A distinct outer shape from any base type, so it can have its own WrapNullable<MaybeNull> impl without overlapping the per-base-type impls below.

Trait Implementations§

Source §

impl<S: Ordered> Ordered for Nullable<S>

A nullable column orders like its base type — the NULLs sort, they don’t stop the aggregate from existing.

Source §

impl<S: SqlType> SqlType for Nullable<S>

Source §

type Native = Option<<S as SqlType>::Native>

Source §

impl<T: Summable> Summable for Nullable<T>

Source §

const SUM_CAST: Option<CastTarget> = T::SUM_CAST

Source §

const AVG_CAST: Option<CastTarget> = T::AVG_CAST

Source §

type Sum = <T as Summable>::Sum

Source §

impl TextLike for Nullable<Text>

Source §

impl<T> WrapNullable<MaybeNull> for Nullable<T>

Source §

type Output = Nullable<T>

Auto Trait Implementations§

§

impl<T> Freeze for Nullable<T>
where PhantomData<T>: Freeze,

§

impl<T> RefUnwindSafe for Nullable<T>
where PhantomData<T>: RefUnwindSafe,

§

impl<T> Send for Nullable<T>
where PhantomData<T>: Send,

§

impl<T> Sync for Nullable<T>
where PhantomData<T>: Sync,

§

impl<T> Unpin for Nullable<T>
where PhantomData<T>: Unpin,

§

impl<T> UnsafeUnpin for Nullable<T>
where PhantomData<T>: UnsafeUnpin,

§

impl<T> UnwindSafe for Nullable<T>
where PhantomData<T>: UnwindSafe,

Blanket Implementations§

Source §

impl<T> Any for T
where T: 'static + ?Sized,

Source §

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

Source §

impl<T> AssignsTo<Nullable<T>> for T
where T: SqlType,

Source §

impl<T> AssignsTo<T> for T
where T: SqlType,

Source §

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

Source §

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

Source §

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

Source §

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

Mutably borrows from an owned value. Read more

Source §

impl<T> Comparable<Nullable<T>> for T
where T: SqlType,

Source §

impl<T> Comparable<T> for T
where T: SqlType,

Source §

impl<T> From<T> for T

Source §

fn from(t: T) -> T

Returns the argument unchanged.

Source §

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

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.

Source §

impl<S> Superset<Nil, Nil> for S

Source §

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

Source §

type Error = !

The type returned in the event of a conversion error.

Source §

fn try_from(value: U) -> Result<T, !>

Performs the conversion.

Source §

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

Source §

type Error = >::Error

The type returned in the event of a conversion error.

Source §

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

Performs the conversion.

Source §

impl<T> WrapNullable<NotNull> for T

Source §

Nullable

Struct Nullable Copy item path

Trait Implementations§

impl AssignsTo<Nullable<BigInt>> for Integer

impl AssignsTo<Nullable<BigInt>> for Nullable<Integer>

impl AssignsTo<Nullable<Numeric>> for Integer

impl AssignsTo<Nullable<Numeric>> for Nullable<Integer>

impl AssignsTo<Nullable<Numeric>> for BigInt

impl AssignsTo<Nullable<Numeric>> for Nullable<BigInt>

impl AssignsTo<Nullable<Numeric>> for Real

impl AssignsTo<Nullable<Numeric>> for Nullable<Real>

impl AssignsTo<Nullable<Real>> for Integer

impl AssignsTo<Nullable<Real>> for Nullable<Integer>

impl AssignsTo<Nullable<Real>> for BigInt

impl AssignsTo<Nullable<Real>> for Nullable<BigInt>

impl BoolLike for Nullable<Bool>

impl Comparable<BigInt> for Nullable<Integer>

impl Comparable<BigInt> for Nullable<Real>

impl Comparable<BigInt> for Nullable<Numeric>

impl Comparable<Integer> for Nullable<BigInt>

impl Comparable<Integer> for Nullable<Real>

impl Comparable<Integer> for Nullable<Numeric>

impl Comparable<Nullable<BigInt>> for Integer

impl Comparable<Nullable<BigInt>> for Nullable<Integer>

impl Comparable<Nullable<BigInt>> for Real

impl Comparable<Nullable<BigInt>> for Nullable<Real>

impl Comparable<Nullable<BigInt>> for Numeric

impl Comparable<Nullable<BigInt>> for Nullable<Numeric>

impl Comparable<Nullable<Integer>> for BigInt

impl Comparable<Nullable<Integer>> for Nullable<BigInt>

impl Comparable<Nullable<Integer>> for Real

impl Comparable<Nullable<Integer>> for Nullable<Real>

impl Comparable<Nullable<Integer>> for Numeric

impl Comparable<Nullable<Integer>> for Nullable<Numeric>

impl Comparable<Nullable<Numeric>> for Integer

impl Comparable<Nullable<Numeric>> for Nullable<Integer>

impl Comparable<Nullable<Numeric>> for BigInt

impl Comparable<Nullable<Numeric>> for Nullable<BigInt>

impl Comparable<Nullable<Numeric>> for Real

impl Comparable<Nullable<Numeric>> for Nullable<Real>

impl Comparable<Nullable<Real>> for Integer

impl Comparable<Nullable<Real>> for Nullable<Integer>

impl Comparable<Nullable<Real>> for BigInt

impl Comparable<Nullable<Real>> for Nullable<BigInt>

impl Comparable<Nullable<Real>> for Numeric

impl Comparable<Nullable<Real>> for Nullable<Numeric>

impl Comparable<Numeric> for Nullable<Integer>

impl Comparable<Numeric> for Nullable<BigInt>

impl Comparable<Numeric> for Nullable<Real>

impl Comparable<Real> for Nullable<Integer>

impl Comparable<Real> for Nullable<BigInt>

impl Comparable<Real> for Nullable<Numeric>

impl<T: SqlType> Comparable<T> for Nullable<T>

impl<S: Ordered> Ordered for Nullable<S>

impl<S: SqlType> SqlType for Nullable<S>

type Native = Option<<S as SqlType>::Native>

impl<T: Summable> Summable for Nullable<T>

const SUM_CAST: Option<CastTarget> = T::SUM_CAST

const AVG_CAST: Option<CastTarget> = T::AVG_CAST

type Sum = <T as Summable>::Sum

impl TextLike for Nullable<Text>

impl<T> WrapNullable<MaybeNull> for Nullable<T>

type Output = Nullable<T>

Auto Trait Implementations§

impl<T> Freeze for Nullable<T>where PhantomData<T>: Freeze,

impl<T> RefUnwindSafe for Nullable<T>where PhantomData<T>: RefUnwindSafe,

impl<T> Send for Nullable<T>where PhantomData<T>: Send,

impl<T> Sync for Nullable<T>where PhantomData<T>: Sync,

impl<T> Unpin for Nullable<T>where PhantomData<T>: Unpin,

impl<T> UnsafeUnpin for Nullable<T>where PhantomData<T>: UnsafeUnpin,

impl<T> UnwindSafe for Nullable<T>where PhantomData<T>: UnwindSafe,

Blanket Implementations§

impl<T> Any for Twhere T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T> AssignsTo<Nullable<T>> for Twhere T: SqlType,

impl<T> AssignsTo<T> for Twhere T: SqlType,

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

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Twhere T: ?Sized,

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

Struct Nullable

impl<T> Freeze for Nullable<T>
where PhantomData<T>: Freeze,

impl<T> RefUnwindSafe for Nullable<T>
where PhantomData<T>: RefUnwindSafe,

impl<T> Send for Nullable<T>
where PhantomData<T>: Send,

impl<T> Sync for Nullable<T>
where PhantomData<T>: Sync,

impl<T> Unpin for Nullable<T>
where PhantomData<T>: Unpin,

impl<T> UnsafeUnpin for Nullable<T>
where PhantomData<T>: UnsafeUnpin,

impl<T> UnwindSafe for Nullable<T>
where PhantomData<T>: UnwindSafe,

impl<T> Any for T
where T: 'static + ?Sized,

impl<T> AssignsTo<Nullable<T>> for T
where T: SqlType,

impl<T> AssignsTo<T> for T
where T: SqlType,

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

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

impl<T> Comparable<Nullable<T>> for T
where T: SqlType,

impl<T> Comparable<T> for T
where T: SqlType,

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

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

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