Trait SelectableDataSource 

pub trait SelectableDataSource<T = Value, C = Expression<T>>: DataSource {
    type Select: Selectable<T, C>;

    // Required methods
    fn select(&self) -> Self::Select;
    fn execute_select(
        &self,
        select: &Self::Select,
    ) -> impl Future<Output = Result<Vec<T>>> + Send;

    // Provided method
    fn add_select_column(
        &self,
        select: &mut Self::Select,
        expression: Expression<T>,
        alias: Option<&str>,
    )
       where T: Clone { ... }
}

Datasource that support creation and execution of select queries

Required Associated Types

type Select: Selectable<T, C>

Required Methods

fn select(&self) -> Self::Select

fn execute_select( &self, select: &Self::Select, ) -> impl Future<Output = Result<Vec<T>>> + Send

Provided Methods

fn add_select_column( &self, select: &mut Self::Select, expression: Expression<T>, alias: Option<&str>, )

where T: Clone,

Add a column expression to a select query with optional alias. Backends must override this if they support aliases.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl SelectableDataSource for MockSelectableDataSource

type Select = MockSelect

impl SelectableDataSource for MockBuilder

type Select = MockSelect