Struct diesel::expression::array_comparison::In
source · #[non_exhaustive]pub struct In<T, U> {
pub left: T,
pub values: U,
}
Available on crate feature
i-implement-a-third-party-backend-and-opt-into-breaking-changes
only.Expand description
Query dsl node that represents a left IN (values)
expression
Third party backend can customize the QueryFragment
implementation of this query dsl node via
SqlDialect::ArrayComparison
. A customized implementation
is expected to provide the same semantics as an ANSI SQL
IN
expression.
The postgres backend provided a specialized implementation
by using left = ANY(values)
as optimized variant instead.
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.left: T
The expression on the left side of the IN
keyword
values: U
The values clause of the IN
expression
Trait Implementations§
source§impl<T, U> Expression for In<T, U>
impl<T, U> Expression for In<T, U>
source§impl<T, U, DB> QueryFragment<DB> for In<T, U>
impl<T, U, DB> QueryFragment<DB> for In<T, U>
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<T, U, DB> QueryFragment<DB, AnsiSqlArrayComparison> for In<T, U>where
DB: Backend + SqlDialect<ArrayComparison = AnsiSqlArrayComparison>,
T: QueryFragment<DB>,
U: QueryFragment<DB> + MaybeEmpty,
impl<T, U, DB> QueryFragment<DB, AnsiSqlArrayComparison> for In<T, U>where
DB: Backend + SqlDialect<ArrayComparison = AnsiSqlArrayComparison>,
T: QueryFragment<DB>,
U: QueryFragment<DB> + MaybeEmpty,
source§fn walk_ast<'b>(&'b self, out: AstPass<'_, 'b, DB>) -> QueryResult<()>
fn walk_ast<'b>(&'b self, out: 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<T: QueryId, U: QueryId> QueryId for In<T, U>
impl<T: QueryId, U: QueryId> QueryId for In<T, U>
source§impl<T, U, __GroupByClause> ValidGrouping<__GroupByClause> for In<T, U>where
T: ValidGrouping<__GroupByClause>,
U: ValidGrouping<__GroupByClause>,
T::IsAggregate: MixedAggregates<U::IsAggregate>,
impl<T, U, __GroupByClause> ValidGrouping<__GroupByClause> for In<T, U>where
T: ValidGrouping<__GroupByClause>,
U: ValidGrouping<__GroupByClause>,
T::IsAggregate: MixedAggregates<U::IsAggregate>,
source§type IsAggregate = <<T as ValidGrouping<__GroupByClause>>::IsAggregate as MixedAggregates<<U as ValidGrouping<__GroupByClause>>::IsAggregate>>::Output
type IsAggregate = <<T as ValidGrouping<__GroupByClause>>::IsAggregate as MixedAggregates<<U as ValidGrouping<__GroupByClause>>::IsAggregate>>::Output
Is this expression aggregate? Read more
impl<T, U, QS> AppearsOnTable<QS> for In<T, U>
impl<T: Copy, U: Copy> Copy for In<T, U>
impl<T, U, QS> SelectableExpression<QS> for In<T, U>
Auto Trait Implementations§
impl<T, U> Freeze for In<T, U>
impl<T, U> RefUnwindSafe for In<T, U>where
T: RefUnwindSafe,
U: RefUnwindSafe,
impl<T, U> Send for In<T, U>
impl<T, U> Sync for In<T, U>
impl<T, U> Unpin for In<T, U>
impl<T, U> UnwindSafe for In<T, U>where
T: UnwindSafe,
U: UnwindSafe,
Blanket Implementations§
source§impl<T, ST> AsExpression<ST> for T
impl<T, ST> AsExpression<ST> for T
source§type Expression = T
type Expression = T
The expression being returned
source§fn as_expression(self) -> T
fn as_expression(self) -> T
Perform the conversion
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
)source§impl<Conn, DB, T> ExecuteDsl<Conn, DB> for T
impl<Conn, DB, T> ExecuteDsl<Conn, DB> for T
source§impl<T> IntoSql for T
impl<T> IntoSql for T
source§impl<T> NullableExpressionMethods for Twhere
T: Expression,
impl<T> NullableExpressionMethods for Twhere
T: Expression,
source§fn nullable(self) -> Nullable<Self>
fn nullable(self) -> Nullable<Self>
Converts this potentially non-null expression into one which is treated
as nullable. This method has no impact on the generated SQL, and is only
used to allow certain comparisons that would otherwise fail to compile. Read more
source§fn assume_not_null(self) -> AssumeNotNull<Self>
fn assume_not_null(self) -> AssumeNotNull<Self>
Converts this potentially nullable expression into one which will be assumed
to be not-null. This method has no impact on the generated SQL, however it will
enable you to attempt deserialization of the returned value in a non-
Option
. Read moresource§impl<T> PgExpressionMethods for Twhere
T: Expression,
impl<T> PgExpressionMethods for Twhere
T: Expression,
source§fn is_not_distinct_from<T>(self, other: T) -> IsNotDistinctFrom<Self, T>
fn is_not_distinct_from<T>(self, other: T) -> IsNotDistinctFrom<Self, T>
Available on crate feature
postgres_backend
only.Creates a PostgreSQL
IS NOT DISTINCT FROM
expression. Read moresource§fn is_distinct_from<T>(self, other: T) -> IsDistinctFrom<Self, T>
fn is_distinct_from<T>(self, other: T) -> IsDistinctFrom<Self, T>
Available on crate feature
postgres_backend
only.Creates a PostgreSQL
IS DISTINCT FROM
expression. Read more