Struct Selector 

pub struct Selector<S>
where
    S: SelectorTrait,
{ /* private fields */ }

A ready-to-execute SELECT query backed by a SelectStatement. The type parameter S (a SelectorTrait) determines what each row is decoded into. Build one via Select::into_model or Select::into_partial_model, then call .one(db) / .all(db) / .paginate(db, n).

Implementations

impl<S> Selector<S>

where S: SelectorTrait,

pub fn into_statement(self, builder: DbBackend) -> Statement

Get the SQL statement

pub fn one<C>(self, db: &C) -> Result<Option<S::Item>, DbErr>

where C: ConnectionTrait,

Get an item from the Select query

pub fn all<C>(self, db: &C) -> Result<Vec<S::Item>, DbErr>

where C: ConnectionTrait,

Get all items from the Select query

pub fn stream<'a: 'b, 'b, C>( self, db: &'a C, ) -> Result<Box<dyn Iterator<Item = Result<S::Item, DbErr>> + 'b>, DbErr>

where C: ConnectionTrait + StreamTrait, S: 'b,

Available on crate feature stream only.

Stream the results of the Select operation

Trait Implementations

impl<S> Clone for Selector<S>

where S: SelectorTrait + Clone,

fn clone(&self) -> Selector<S>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<S> Debug for Selector<S>

where S: SelectorTrait + Debug,

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'db, C, S> PaginatorTrait<'db, C> for Selector<S>

where C: ConnectionTrait, S: SelectorTrait + 'db,

type Selector = S

The SelectorTrait that materialises each row of the page.

fn paginate(self, db: &'db C, page_size: u64) -> Paginator<'db, C, S>

Paginate the result of a select operation.

fn count(self, db: &'db C) -> Result<u64, DbErr>

where Self: Sized,

Perform a count on the paginated results

impl<S> SelectExt for Selector<S>

where S: SelectorTrait,

fn exists<C>(self, db: &C) -> Result<bool, DbErr>

where C: ConnectionTrait, Self: Sized,

Check if any records exist