Trait Fetch

pub trait Fetch<'c, 'out, E>: ToSql + CheckedSql
where
    E: Executor<'c> + 'out,
{
    type Output: for<'r> FromRow<'r, <E::Database as Database>::Row>;

    // Provided methods
    fn fetch_one(
        &self,
        exec: E,
    ) -> Pin<Box<dyn Future<Output = Result<Self::Output, Error>> + Send + 'out>> { ... }
    fn fetch_optional(
        &self,
        exec: E,
    ) -> Pin<Box<dyn Future<Output = Result<Option<Self::Output>, Error>> + Send + 'out>> { ... }
}

Required Associated Types

type Output: for<'r> FromRow<'r, <E::Database as Database>::Row>

Provided Methods

fn fetch_one( &self, exec: E, ) -> Pin<Box<dyn Future<Output = Result<Self::Output, Error>> + Send + 'out>>

fn fetch_optional( &self, exec: E, ) -> Pin<Box<dyn Future<Output = Result<Option<Self::Output>, Error>> + Send + 'out>>

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.

Implementors

impl<'c, 'out, E, S> Fetch<'c, 'out, E> for SelectStatement<S, WildCard>

where E: Executor<'c> + 'out, S: Selectable, S::Table: for<'r> FromRow<'r, <E::Database as Database>::Row>,

type Output = <S as Selectable>::Table