Trait IntoSelect

pub trait IntoSelect<'columns, 'transaction, S>: Sized {
    type Out: 'transaction;

    // Required method
    fn into_select(self) -> Select<'columns, 'transaction, S, Self::Out>;
}

This trait is implemented by everything that can be retrieved from the database.

The most common type that implements IntoSelect is Expr. Tuples of two values also implement IntoSelect. If you want to return more than two values, then you should use a struct that derives rust_query::Select.

Required Associated Types

type Out: 'transaction

The type that results from executing the Select.

Required Methods

fn into_select(self) -> Select<'columns, 'transaction, S, Self::Out>

This method is what tells rust-query how to turn the value into a Select.

The only way to implement this method is by constructing a different value that implements IntoSelect and then calling the IntoSelect::into_select method on that other value. The result can then be modified with Select::map.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<'columns, 'transaction, S> IntoSelect<'columns, 'transaction, S> for ()

type Out = ()

fn into_select(self) -> Select<'columns, 'transaction, S, Self::Out>

impl<'columns, 'transaction, S, A, B> IntoSelect<'columns, 'transaction, S> for (A, B)

where A: IntoSelect<'columns, 'transaction, S>, B: IntoSelect<'columns, 'transaction, S>,

type Out = (<A as IntoSelect<'columns, 'transaction, S>>::Out, <B as IntoSelect<'columns, 'transaction, S>>::Out)

fn into_select(self) -> Select<'columns, 'transaction, S, Self::Out>

impl<'columns, 'transaction, S, T> IntoSelect<'columns, 'transaction, S> for &T

where T: IntoSelect<'columns, 'transaction, S> + Clone,

type Out = <T as IntoSelect<'columns, 'transaction, S>>::Out

fn into_select(self) -> Select<'columns, 'transaction, S, Self::Out>

Implementors

impl<'columns, 'transaction, S, Out: 'transaction> IntoSelect<'columns, 'transaction, S> for Select<'columns, 'transaction, S, Out>

type Out = Out

impl<'columns, 'transaction, S, T> IntoSelect<'columns, 'transaction, S> for Expr<'columns, S, T>

where T: MyTyp,

type Out = <T as MyTyp>::Out<'transaction>