Trait diesel::expression::SelectableExpression

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pub trait SelectableExpression<QS: ?Sized>: AppearsOnTable<QS> { }
Expand description

Indicates that an expression can be selected from a source.

Columns will implement this for their table. Certain special types, like CountStar and Bound will implement this for all sources. Most compound expressions will implement this if each of their parts implement it.

Notably, columns will not implement this trait for the right side of a left join. To select a column or expression using a column from the right side of a left join, you must call .nullable() on it.

Implementations on Foreign Types§

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impl<'a, T, QS> SelectableExpression<QS> for &'a T

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impl<T0, QS> SelectableExpression<QS> for (T0,)

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impl<T0, T1, QS> SelectableExpression<QS> for (T0, T1)

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impl<T0, T1, T2, QS> SelectableExpression<QS> for (T0, T1, T2)

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impl<T0, T1, T2, T3, QS> SelectableExpression<QS> for (T0, T1, T2, T3)

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impl<T0, T1, T2, T3, T4, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4)

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impl<T0, T1, T2, T3, T4, T5, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5)

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impl<T0, T1, T2, T3, T4, T5, T6, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29, T30)

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impl<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31, QS> SelectableExpression<QS> for (T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31)

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impl<T, QS> SelectableExpression<QS> for Box<T>
where T: SelectableExpression<QS> + ?Sized, Box<T>: AppearsOnTable<QS>,

Implementors§

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impl<L, R, QS> SelectableExpression<QS> for Concat<L, R>

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impl<QS> SelectableExpression<QS> for now
where now: AppearsOnTable<QS>,

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impl<QS> SelectableExpression<QS> for today
where today: AppearsOnTable<QS>,

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impl<QS, Query, Value> SelectableExpression<QS> for UncheckedBind<Query, Value>
where Self: AppearsOnTable<QS>,

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impl<QS, ST, T> SelectableExpression<QS> for SqlLiteral<ST, T>
where Self: Expression,

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impl<S, C> SelectableExpression<Alias<S>> for AliasedField<S, C>
where S: AliasSource, C: Column<Table = S::Target>, Self: AppearsOnTable<Alias<S>>,

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impl<ST, I, QS> SelectableExpression<QS> for Many<ST, I>
where Many<ST, I>: AppearsOnTable<QS>, ST: SingleValue, I: AsExpression<ST>, <I as AsExpression<ST>>::Expression: SelectableExpression<QS>,

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.
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impl<T, QS> SelectableExpression<QS> for Exists<T>
where Self: AppearsOnTable<QS>, Subselect<T, Bool>: SelectableExpression<QS>,

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.
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impl<T, U, QS> SelectableExpression<QS> for In<T, U>

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.
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impl<T, U, QS> SelectableExpression<QS> for NotIn<T, U>

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.
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impl<W, T, E, QS> SelectableExpression<QS> for CaseWhen<CaseWhenConditionsLeaf<W, T>, ElseExpression<E>>
where CaseWhen<CaseWhenConditionsLeaf<W, T>, ElseExpression<E>>: AppearsOnTable<QS>, W: SelectableExpression<QS>, T: SelectableExpression<QS>, E: SelectableExpression<QS>,

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impl<W, T, QS> SelectableExpression<QS> for CaseWhen<CaseWhenConditionsLeaf<W, T>, NoElseExpression>
where CaseWhen<CaseWhenConditionsLeaf<W, T>, NoElseExpression>: AppearsOnTable<QS>, W: SelectableExpression<QS>, T: SelectableExpression<QS>,

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impl<W, T, Whens, E, QS> SelectableExpression<QS> for CaseWhen<CaseWhenConditionsIntermediateNode<W, T, Whens>, E>