Struct diesel::query_source::Alias
source · #[non_exhaustive]pub struct Alias<S> {
pub source: S,
}
Expand description
Represents an alias within diesel’s query builder
See alias!
for more details.
Fields (Non-exhaustive)§
This struct is marked as non-exhaustive
Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional
Struct { .. }
syntax; cannot be matched against without a wildcard ..
; and struct update syntax will not work.source: S
The inner alias definition
Implementations§
source§impl<S: AliasSource> Alias<S>
impl<S: AliasSource> Alias<S>
sourcepub fn field<F>(&self, field: F) -> AliasedField<S, F>
pub fn field<F>(&self, field: F) -> AliasedField<S, F>
Maps a single field of the source table in this alias
sourcepub fn fields<Fields>(&self, fields: Fields) -> AliasedFields<S, Fields>where
Fields: FieldAliasMapper<S>,
pub fn fields<Fields>(&self, fields: Fields) -> AliasedFields<S, Fields>where
Fields: FieldAliasMapper<S>,
Maps multiple fields of the source table in this alias (takes in tuples and some expressions)
Trait Implementations§
source§impl<S, QS> AppearsInFromClause<QS> for Alias<S>where
S: AliasSource,
S::Target: AliasAppearsInFromClause<S, QS>,
impl<S, QS> AppearsInFromClause<QS> for Alias<S>where
S: AliasSource,
S::Target: AliasAppearsInFromClause<S, QS>,
source§type Count = <<S as AliasSource>::Target as AliasAppearsInFromClause<S, QS>>::Count
type Count = <<S as AliasSource>::Target as AliasAppearsInFromClause<S, QS>>::Count
How many times does
Self
appear in QS
?source§impl<S> AsQuery for Alias<S>where
S: AliasSource,
S::Target: AsQuery,
Self: QuerySource,
<Self as QuerySource>::DefaultSelection: ValidGrouping<()>,
impl<S> AsQuery for Alias<S>where
S: AliasSource,
S::Target: AsQuery,
Self: QuerySource,
<Self as QuerySource>::DefaultSelection: ValidGrouping<()>,
source§type SqlType = <<Alias<S> as QuerySource>::DefaultSelection as Expression>::SqlType
type SqlType = <<Alias<S> as QuerySource>::DefaultSelection as Expression>::SqlType
The SQL type of
Self::Query
source§type Query = SelectStatement<FromClause<Alias<S>>>
type Query = SelectStatement<FromClause<Alias<S>>>
What kind of query does this type represent?
source§impl<'a, S, DB> BoxedDsl<'a, DB> for Alias<S>where
Alias<S>: QuerySource + AsQuery<Query = SelectStatement<FromClause<Alias<S>>>>,
SelectStatement<FromClause<Alias<S>>>: BoxedDsl<'a, DB>,
<Alias<S> as QuerySource>::DefaultSelection: Expression<SqlType = <Alias<S> as AsQuery>::SqlType> + ValidGrouping<()>,
<Alias<S> as AsQuery>::SqlType: TypedExpressionType,
impl<'a, S, DB> BoxedDsl<'a, DB> for Alias<S>where
Alias<S>: QuerySource + AsQuery<Query = SelectStatement<FromClause<Alias<S>>>>,
SelectStatement<FromClause<Alias<S>>>: BoxedDsl<'a, DB>,
<Alias<S> as QuerySource>::DefaultSelection: Expression<SqlType = <Alias<S> as AsQuery>::SqlType> + ValidGrouping<()>,
<Alias<S> as AsQuery>::SqlType: TypedExpressionType,
source§type Output = <SelectStatement<FromClause<Alias<S>>> as BoxedDsl<'a, DB>>::Output
type Output = <SelectStatement<FromClause<Alias<S>>> as BoxedDsl<'a, DB>>::Output
The return type of
internal_into_boxed
source§fn internal_into_boxed(self) -> Self::Output
fn internal_into_boxed(self) -> Self::Output
See the trait documentation.
source§impl<S> CombineDsl for Alias<S>
impl<S> CombineDsl for Alias<S>
source§fn union<Rhs>(self, rhs: Rhs) -> Union<Self, Rhs>
fn union<Rhs>(self, rhs: Rhs) -> Union<Self, Rhs>
Combine two queries using a SQL
UNION
Read moresource§fn union_all<Rhs>(self, rhs: Rhs) -> UnionAll<Self, Rhs>
fn union_all<Rhs>(self, rhs: Rhs) -> UnionAll<Self, Rhs>
Combine two queries using a SQL
UNION ALL
source§fn intersect<Rhs>(self, rhs: Rhs) -> Intersect<Self, Rhs>
fn intersect<Rhs>(self, rhs: Rhs) -> Intersect<Self, Rhs>
Combine two queries using a SQL
INTERSECT
source§fn intersect_all<Rhs>(self, rhs: Rhs) -> IntersectAll<Self, Rhs>
fn intersect_all<Rhs>(self, rhs: Rhs) -> IntersectAll<Self, Rhs>
Combine two queries using a SQL
INTERSECT ALL
source§impl<S, Selection> DistinctOnDsl<Selection> for Alias<S>where
S: AliasSource,
Selection: SelectableExpression<Self>,
Self: QuerySource + AsQuery<Query = SelectStatement<FromClause<Self>>>,
SelectStatement<FromClause<Self>>: DistinctOnDsl<Selection>,
<Self as QuerySource>::DefaultSelection: Expression<SqlType = <Self as AsQuery>::SqlType> + ValidGrouping<()>,
<Self as AsQuery>::SqlType: TypedExpressionType,
impl<S, Selection> DistinctOnDsl<Selection> for Alias<S>where
S: AliasSource,
Selection: SelectableExpression<Self>,
Self: QuerySource + AsQuery<Query = SelectStatement<FromClause<Self>>>,
SelectStatement<FromClause<Self>>: DistinctOnDsl<Selection>,
<Self as QuerySource>::DefaultSelection: Expression<SqlType = <Self as AsQuery>::SqlType> + ValidGrouping<()>,
<Self as AsQuery>::SqlType: TypedExpressionType,
source§type Output = <SelectStatement<FromClause<Alias<S>>> as DistinctOnDsl<Selection>>::Output
type Output = <SelectStatement<FromClause<Alias<S>>> as DistinctOnDsl<Selection>>::Output
The type returned by
.distinct_on
source§fn distinct_on(self, selection: Selection) -> DistinctOn<Self, Selection>
fn distinct_on(self, selection: Selection) -> DistinctOn<Self, Selection>
See the trait documentation
source§impl<S, PK> FindDsl<PK> for Alias<S>where
S: AliasSource,
S::Target: Table,
<S::Target as Table>::PrimaryKey: FieldAliasMapper<S>,
<<S::Target as Table>::PrimaryKey as FieldAliasMapper<S>>::Out: EqAll<PK>,
Self: FilterDsl<<<<S::Target as Table>::PrimaryKey as FieldAliasMapper<S>>::Out as EqAll<PK>>::Output>,
impl<S, PK> FindDsl<PK> for Alias<S>where
S: AliasSource,
S::Target: Table,
<S::Target as Table>::PrimaryKey: FieldAliasMapper<S>,
<<S::Target as Table>::PrimaryKey as FieldAliasMapper<S>>::Out: EqAll<PK>,
Self: FilterDsl<<<<S::Target as Table>::PrimaryKey as FieldAliasMapper<S>>::Out as EqAll<PK>>::Output>,
source§impl<S, Expr> GroupByDsl<Expr> for Alias<S>where
Expr: Expression,
Self: QuerySource + AsQuery<Query = SelectStatement<FromClause<Self>>>,
<Self as QuerySource>::DefaultSelection: Expression<SqlType = <Self as AsQuery>::SqlType> + ValidGrouping<()>,
<Self as AsQuery>::SqlType: TypedExpressionType,
<Self as AsQuery>::Query: GroupByDsl<Expr>,
impl<S, Expr> GroupByDsl<Expr> for Alias<S>where
Expr: Expression,
Self: QuerySource + AsQuery<Query = SelectStatement<FromClause<Self>>>,
<Self as QuerySource>::DefaultSelection: Expression<SqlType = <Self as AsQuery>::SqlType> + ValidGrouping<()>,
<Self as AsQuery>::SqlType: TypedExpressionType,
<Self as AsQuery>::Query: GroupByDsl<Expr>,
source§type Output = <SelectStatement<FromClause<Alias<S>>> as GroupByDsl<Expr>>::Output
type Output = <SelectStatement<FromClause<Alias<S>>> as GroupByDsl<Expr>>::Output
The type returned by
.group_by
source§impl<S, Lock> LockingDsl<Lock> for Alias<S>where
Self: QuerySource + AsQuery<Query = SelectStatement<FromClause<Self>>>,
<Self as QuerySource>::DefaultSelection: Expression<SqlType = <Self as AsQuery>::SqlType> + ValidGrouping<()>,
<Self as AsQuery>::SqlType: TypedExpressionType,
impl<S, Lock> LockingDsl<Lock> for Alias<S>where
Self: QuerySource + AsQuery<Query = SelectStatement<FromClause<Self>>>,
<Self as QuerySource>::DefaultSelection: Expression<SqlType = <Self as AsQuery>::SqlType> + ValidGrouping<()>,
<Self as AsQuery>::SqlType: TypedExpressionType,
source§type Output = <SelectStatement<FromClause<Alias<S>>> as LockingDsl<Lock>>::Output
type Output = <SelectStatement<FromClause<Alias<S>>> as LockingDsl<Lock>>::Output
The type returned by
set_lock
. See dsl::ForUpdate
and friends for
convenient access to this type.source§impl<S, Predicate> OrFilterDsl<Predicate> for Alias<S>
impl<S, Predicate> OrFilterDsl<Predicate> for Alias<S>
source§impl<S: AliasSource> QueryDsl for Alias<S>
impl<S: AliasSource> QueryDsl for Alias<S>
source§fn distinct_on<Expr>(self, expr: Expr) -> DistinctOn<Self, Expr>where
Self: DistinctOnDsl<Expr>,
fn distinct_on<Expr>(self, expr: Expr) -> DistinctOn<Self, Expr>where
Self: DistinctOnDsl<Expr>,
Adds the
DISTINCT ON
clause to a query. Read moresource§fn select<Selection>(self, selection: Selection) -> Select<Self, Selection>where
Selection: Expression,
Self: SelectDsl<Selection>,
fn select<Selection>(self, selection: Selection) -> Select<Self, Selection>where
Selection: Expression,
Self: SelectDsl<Selection>,
Adds a
SELECT
clause to the query. Read moresource§fn inner_join<Rhs>(self, rhs: Rhs) -> InnerJoin<Self, Rhs>where
Self: JoinWithImplicitOnClause<Rhs, Inner>,
fn inner_join<Rhs>(self, rhs: Rhs) -> InnerJoin<Self, Rhs>where
Self: JoinWithImplicitOnClause<Rhs, Inner>,
Join two tables using a SQL
INNER JOIN
. Read moresource§fn left_outer_join<Rhs>(self, rhs: Rhs) -> LeftJoin<Self, Rhs>where
Self: JoinWithImplicitOnClause<Rhs, LeftOuter>,
fn left_outer_join<Rhs>(self, rhs: Rhs) -> LeftJoin<Self, Rhs>where
Self: JoinWithImplicitOnClause<Rhs, LeftOuter>,
Join two tables using a SQL
LEFT OUTER JOIN
. Read moresource§fn left_join<Rhs>(self, rhs: Rhs) -> LeftJoin<Self, Rhs>where
Self: JoinWithImplicitOnClause<Rhs, LeftOuter>,
fn left_join<Rhs>(self, rhs: Rhs) -> LeftJoin<Self, Rhs>where
Self: JoinWithImplicitOnClause<Rhs, LeftOuter>,
Alias for
left_outer_join
.source§fn filter<Predicate>(self, predicate: Predicate) -> Filter<Self, Predicate>where
Self: FilterDsl<Predicate>,
fn filter<Predicate>(self, predicate: Predicate) -> Filter<Self, Predicate>where
Self: FilterDsl<Predicate>,
Adds to the
WHERE
clause of a query. Read moresource§fn or_filter<Predicate>(self, predicate: Predicate) -> OrFilter<Self, Predicate>where
Self: OrFilterDsl<Predicate>,
fn or_filter<Predicate>(self, predicate: Predicate) -> OrFilter<Self, Predicate>where
Self: OrFilterDsl<Predicate>,
source§fn find<PK>(self, id: PK) -> Find<Self, PK>where
Self: FindDsl<PK>,
fn find<PK>(self, id: PK) -> Find<Self, PK>where
Self: FindDsl<PK>,
Attempts to find a single record from the given table by primary key. Read more
source§fn order<Expr>(self, expr: Expr) -> Order<Self, Expr>where
Expr: Expression,
Self: OrderDsl<Expr>,
fn order<Expr>(self, expr: Expr) -> Order<Self, Expr>where
Expr: Expression,
Self: OrderDsl<Expr>,
Sets the order clause of a query. Read more
source§fn order_by<Expr>(self, expr: Expr) -> OrderBy<Self, Expr>where
Expr: Expression,
Self: OrderDsl<Expr>,
fn order_by<Expr>(self, expr: Expr) -> OrderBy<Self, Expr>where
Expr: Expression,
Self: OrderDsl<Expr>,
Alias for
order
source§fn then_order_by<Order>(self, order: Order) -> ThenOrderBy<Self, Order>where
Self: ThenOrderDsl<Order>,
fn then_order_by<Order>(self, order: Order) -> ThenOrderBy<Self, Order>where
Self: ThenOrderDsl<Order>,
Appends to the
ORDER BY
clause of this SQL query. Read moresource§fn group_by<GB>(self, group_by: GB) -> GroupBy<Self, GB>where
GB: Expression,
Self: GroupByDsl<GB>,
fn group_by<GB>(self, group_by: GB) -> GroupBy<Self, GB>where
GB: Expression,
Self: GroupByDsl<GB>,
Sets the
group by
clause of a query. Read moresource§impl<S, DB> QueryFragment<DB> for Alias<S>
impl<S, DB> QueryFragment<DB> for Alias<S>
source§fn walk_ast<'b>(&'b self, pass: AstPass<'_, 'b, DB>) -> QueryResult<()>
fn walk_ast<'b>(&'b self, pass: AstPass<'_, 'b, DB>) -> QueryResult<()>
Walk over this
QueryFragment
for all passes. Read moresource§fn to_sql(&self, out: &mut DB::QueryBuilder, backend: &DB) -> QueryResult<()>
fn to_sql(&self, out: &mut DB::QueryBuilder, backend: &DB) -> QueryResult<()>
Converts this
QueryFragment
to its SQL representation. Read moresource§fn collect_binds<'b>(
&'b self,
out: &mut DB::BindCollector<'b>,
metadata_lookup: &mut DB::MetadataLookup,
backend: &'b DB,
) -> QueryResult<()>
fn collect_binds<'b>( &'b self, out: &mut DB::BindCollector<'b>, metadata_lookup: &mut DB::MetadataLookup, backend: &'b DB, ) -> QueryResult<()>
Serializes all bind parameters in this query. Read more
source§fn is_safe_to_cache_prepared(&self, backend: &DB) -> QueryResult<bool>
fn is_safe_to_cache_prepared(&self, backend: &DB) -> QueryResult<bool>
Is this query safe to store in the prepared statement cache? Read more
source§impl<S, DB> QueryFragment<DB, AsAliasSyntax> for Alias<S>
impl<S, DB> QueryFragment<DB, AsAliasSyntax> for Alias<S>
source§fn walk_ast<'b>(&'b self, pass: AstPass<'_, 'b, DB>) -> QueryResult<()>
fn walk_ast<'b>(&'b self, pass: AstPass<'_, 'b, DB>) -> QueryResult<()>
Walk over this
QueryFragment
for all passes. Read moresource§fn to_sql(&self, out: &mut DB::QueryBuilder, backend: &DB) -> QueryResult<()>
fn to_sql(&self, out: &mut DB::QueryBuilder, backend: &DB) -> QueryResult<()>
Converts this
QueryFragment
to its SQL representation. Read moresource§fn collect_binds<'b>(
&'b self,
out: &mut DB::BindCollector<'b>,
metadata_lookup: &mut DB::MetadataLookup,
backend: &'b DB,
) -> QueryResult<()>
fn collect_binds<'b>( &'b self, out: &mut DB::BindCollector<'b>, metadata_lookup: &mut DB::MetadataLookup, backend: &'b DB, ) -> QueryResult<()>
Serializes all bind parameters in this query. Read more
source§fn is_safe_to_cache_prepared(&self, backend: &DB) -> QueryResult<bool>
fn is_safe_to_cache_prepared(&self, backend: &DB) -> QueryResult<bool>
Is this query safe to store in the prepared statement cache? Read more
source§impl<S> QueryId for Alias<S>
impl<S> QueryId for Alias<S>
source§const HAS_STATIC_QUERY_ID: bool = <S::Target as QueryId>::HAS_STATIC_QUERY_ID
const HAS_STATIC_QUERY_ID: bool = <S::Target as QueryId>::HAS_STATIC_QUERY_ID
Can the SQL generated by
Self
be uniquely identified by its type? Read moresource§impl<S> QuerySource for Alias<S>where
Self: Clone,
S: AliasSource,
S::Target: QuerySource,
<S::Target as QuerySource>::DefaultSelection: FieldAliasMapper<S>,
<<S::Target as QuerySource>::DefaultSelection as FieldAliasMapper<S>>::Out: SelectableExpression<Self>,
impl<S> QuerySource for Alias<S>where
Self: Clone,
S: AliasSource,
S::Target: QuerySource,
<S::Target as QuerySource>::DefaultSelection: FieldAliasMapper<S>,
<<S::Target as QuerySource>::DefaultSelection as FieldAliasMapper<S>>::Out: SelectableExpression<Self>,
source§type FromClause = Alias<S>
type FromClause = Alias<S>
The type returned by
from_clause
source§type DefaultSelection = <<<S as AliasSource>::Target as QuerySource>::DefaultSelection as FieldAliasMapper<S>>::Out
type DefaultSelection = <<<S as AliasSource>::Target as QuerySource>::DefaultSelection as FieldAliasMapper<S>>::Out
The type returned by
default_selection
source§fn from_clause(&self) -> Self::FromClause
fn from_clause(&self) -> Self::FromClause
The actual
FROM
clause of this type. This is typically only called in
QueryFragment
implementations.source§fn default_selection(&self) -> Self::DefaultSelection
fn default_selection(&self) -> Self::DefaultSelection
The default select clause of this type, which should be used if no
select clause was explicitly specified. This should always be a tuple of
all the desired columns, not
star
source§impl<S: AliasSource, Conn> RunQueryDsl<Conn> for Alias<S>
impl<S: AliasSource, Conn> RunQueryDsl<Conn> for Alias<S>
source§fn load<'query, U>(self, conn: &mut Conn) -> QueryResult<Vec<U>>where
Self: LoadQuery<'query, Conn, U>,
fn load<'query, U>(self, conn: &mut Conn) -> QueryResult<Vec<U>>where
Self: LoadQuery<'query, Conn, U>,
source§fn load_iter<'conn, 'query: 'conn, U, B>(
self,
conn: &'conn mut Conn,
) -> QueryResult<Self::RowIter<'conn>>where
U: 'conn,
Self: LoadQuery<'query, Conn, U, B> + 'conn,
fn load_iter<'conn, 'query: 'conn, U, B>(
self,
conn: &'conn mut Conn,
) -> QueryResult<Self::RowIter<'conn>>where
U: 'conn,
Self: LoadQuery<'query, Conn, U, B> + 'conn,
source§fn get_result<'query, U>(self, conn: &mut Conn) -> QueryResult<U>where
Self: LoadQuery<'query, Conn, U>,
fn get_result<'query, U>(self, conn: &mut Conn) -> QueryResult<U>where
Self: LoadQuery<'query, Conn, U>,
Runs the command, and returns the affected row. Read more
source§fn get_results<'query, U>(self, conn: &mut Conn) -> QueryResult<Vec<U>>where
Self: LoadQuery<'query, Conn, U>,
fn get_results<'query, U>(self, conn: &mut Conn) -> QueryResult<Vec<U>>where
Self: LoadQuery<'query, Conn, U>,
Runs the command, returning an
Vec
with the affected rows. Read moresource§impl<S, Expr> ThenOrderDsl<Expr> for Alias<S>
impl<S, Expr> ThenOrderDsl<Expr> for Alias<S>
impl<S: Copy> Copy for Alias<S>
impl<S2, S> JoinTo<Alias<S2>> for Alias<S>where
S2: AliasSource,
S: AliasSource + Default,
S::Target: JoinTo<Alias<S2>>,
<S::Target as JoinTo<Alias<S2>>>::OnClause: FieldAliasMapper<S>,
impl<T, S> JoinTo<T> for Alias<S>
impl<S, C> SelectableExpression<Alias<S>> for AliasedField<S, C>
Auto Trait Implementations§
impl<S> Freeze for Alias<S>where
S: Freeze,
impl<S> RefUnwindSafe for Alias<S>where
S: RefUnwindSafe,
impl<S> Send for Alias<S>where
S: Send,
impl<S> Sync for Alias<S>where
S: Sync,
impl<S> Unpin for Alias<S>where
S: Unpin,
impl<S> UnwindSafe for Alias<S>where
S: UnwindSafe,
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
🔬This is a nightly-only experimental API. (
clone_to_uninit
)