Trait IntoSelectTarget 

pub trait IntoSelectTarget {
    type Marker;
}

Determines the select marker from what was passed to .select().

The marker controls how row types are inferred:

• SelectStar — infer R from the table’s Select model
• SelectCols<C> — infer R from the column value types
• SelectExpr — R must be specified by the user

Implemented automatically for:

• () → SelectStar
• SQL<'a, V> → SelectExpr
• SQLExpr<'a, V, T, N, A> → SelectCols<(Self,)>
• Tuples (A, B, ...) → SelectCols<(A, B, ...)>
• Column ZSTs (proc macro generated)
• Table structs (proc macro generated) → SelectStar

Required Associated Types

type Marker

Implementations on Foreign Types

impl IntoSelectTarget for ()

select(()) → SelectStar — infer row type from the table.

type Marker = SelectStar

impl<T0> IntoSelectTarget for (T0,)

type Marker = SelectCols<(T0,)>

impl<T0, T1> IntoSelectTarget for (T0, T1)

type Marker = SelectCols<(T0, T1)>

impl<T0, T1, T2> IntoSelectTarget for (T0, T1, T2)

type Marker = SelectCols<(T0, T1, T2)>

impl<T0, T1, T2, T3> IntoSelectTarget for (T0, T1, T2, T3)

type Marker = SelectCols<(T0, T1, T2, T3)>

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

type Marker = SelectCols<(T0, T1, T2, T3, T4)>

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

type Marker = SelectCols<(T0, T1, T2, T3, T4, T5)>

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

type Marker = SelectCols<(T0, T1, T2, T3, T4, T5, T6)>

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

type Marker = SelectCols<(T0, T1, T2, T3, T4, T5, T6, T7)>

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

type Marker = SelectCols<(T0, T1, T2, T3, T4, T5, T6, T7, T8)>

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

type Marker = SelectCols<(T0, T1, T2, T3, T4, T5, T6, T7, T8, T9)>

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

type Marker = SelectCols<(T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)>

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

type Marker = SelectCols<(T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11)>

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

type Marker = SelectCols<(T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12)>

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

type Marker = SelectCols<(T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13)>

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

type Marker = SelectCols<(T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14)>

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

type Marker = SelectCols<(T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15)>

Implementors

impl<E> IntoSelectTarget for AliasedExpr<E>

where E: ExprValueType,

type Marker = SelectCols<(AliasedExpr<E>,)>

impl<V: SQLParam> IntoSelectTarget for SQL<'_, V>

select(sql!(...)) → SelectExpr — user must specify row type.

type Marker = SelectExpr

impl<V: SQLParam, T, N, A> IntoSelectTarget for SQLExpr<'_, V, T, N, A>

where T: DataType, N: Nullability, A: AggregateKind,

select(typed_expr) → SelectCols<(Expr,)> — single typed expression.

type Marker = SelectCols<(SQLExpr<'_, V, T, N, A>,)>