Struct diesel::query_source::AliasedField

pub struct AliasedField<S, F> { /* private fields */ }

Represents an aliased field (column) within diesel’s query builder

See alias! for more details.

Trait Implementations

impl<S: Clone, F: Clone> Clone for AliasedField<S, F>

fn clone(&self) -> AliasedField<S, F>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<S: Debug, F: Debug> Debug for AliasedField<S, F>

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

Formats the value using the given formatter.

impl<S, C> Expression for AliasedField<S, C>

where S: AliasSource, C: Column<Table = S::Target> + Expression,

type SqlType = <C as Expression>::SqlType

The type that this expression represents in SQL

impl<S, C, DB> QueryFragment<DB> for AliasedField<S, C>

where S: AliasSource, DB: Backend, C: Column<Table = S::Target>,

fn walk_ast<'b>(&'b self, pass: AstPass<'_, 'b, DB>) -> QueryResult<()>

Walk over this QueryFragment for all passes.

fn to_sql(&self, out: &mut DB::QueryBuilder, backend: &DB) -> QueryResult<()>

Converts this QueryFragment to its SQL representation.

fn collect_binds<'b>( &'b self, out: &mut <DB as HasBindCollector<'b>>::BindCollector, metadata_lookup: &mut DB::MetadataLookup, backend: &'b DB, ) -> QueryResult<()>

Serializes all bind parameters in this query.

fn is_safe_to_cache_prepared(&self, backend: &DB) -> QueryResult<bool>

Is this query safe to store in the prepared statement cache?

fn is_noop(&self, backend: &DB) -> QueryResult<bool>

Does walking this AST have any effect?

impl<S, C> QueryId for AliasedField<S, C>

where S: AliasSource + 'static, S::Target: 'static, C: Column<Table = S::Target> + 'static + QueryId,

type QueryId = AliasedField<S, C>

A type which uniquely represents Self in a SQL query.

const HAS_STATIC_QUERY_ID: bool = <C as QueryId>::HAS_STATIC_QUERY_ID

Can the SQL generated by Self be uniquely identified by its type?

fn query_id() -> Option<TypeId>

Returns the type id of Self::QueryId if Self::HAS_STATIC_QUERY_ID. Returns None otherwise.

impl<S, C> ValidGrouping<()> for AliasedField<S, C>

where S: AliasSource, C: Column<Table = S::Target>,

type IsAggregate = No

Is this expression aggregate?

impl<S, C1, C2> ValidGrouping<AliasedField<S, C1>> for AliasedField<S, C2>

where S: AliasSource, C1: Column<Table = S::Target>, C2: Column<Table = S::Target> + ValidGrouping<C1, IsAggregate = Yes>,

type IsAggregate = Yes

Is this expression aggregate?

impl<QS, S, C> AppearsOnTable<QS> for AliasedField<S, C>

where S: AliasSource, QS: AppearsInFromClause<Alias<S>, Count = Once>, C: Column<Table = S::Target>,

impl<S: Copy, F: Copy> Copy for AliasedField<S, F>

impl<S, C> SelectableExpression<Alias<S>> for AliasedField<S, C>

where S: AliasSource, C: Column<Table = S::Target>, Self: AppearsOnTable<Alias<S>>,