#[non_exhaustive]
pub struct In<T, U> { pub left: T, pub values: U, }
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 sematics as a 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§

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impl<T: Clone, U: Clone> Clone for In<T, U>

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fn clone(&self) -> In<T, U>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: Debug, U: Debug> Debug for In<T, U>

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

Formats the value using the given formatter. Read more
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impl<T, U> Expression for In<T, U>where T: Expression, U: Expression<SqlType = T::SqlType>,

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type SqlType = Bool

The type that this expression represents in SQL
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impl<T, U, DB> QueryFragment<DB, AnsiSqlArrayComparison> for In<T, U>where DB: Backend + SqlDialect<ArrayComparison = AnsiSqlArrayComparison>, T: QueryFragment<DB>, U: QueryFragment<DB> + MaybeEmpty,

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

Walk over this QueryFragment for all passes. Read more
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fn to_sql(&self, out: &mut DB::QueryBuilder, backend: &DB) -> QueryResult<()>

Converts this QueryFragment to its SQL representation. Read more
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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. Read more
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fn is_safe_to_cache_prepared(&self, backend: &DB) -> QueryResult<bool>

Is this query safe to store in the prepared statement cache? Read more
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fn is_noop(&self, backend: &DB) -> QueryResult<bool>

Does walking this AST have any effect?
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impl<T: QueryId, U: QueryId> QueryId for In<T, U>

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type QueryId = In<<T as QueryId>::QueryId, <U as QueryId>::QueryId>

A type which uniquely represents Self in a SQL query. Read more
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const HAS_STATIC_QUERY_ID: bool = _

Can the SQL generated by Self be uniquely identified by its type? Read more
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fn query_id() -> Option<TypeId>

Returns the type id of Self::QueryId if Self::HAS_STATIC_QUERY_ID. Returns None otherwise. Read more
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impl<T, U, __GroupByClause> ValidGrouping<__GroupByClause> for In<T, U>where T: ValidGrouping<__GroupByClause>, U: ValidGrouping<__GroupByClause>, T::IsAggregate: MixedAggregates<U::IsAggregate>,

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type IsAggregate = <<T as ValidGrouping<__GroupByClause>>::IsAggregate as MixedAggregates<<U as ValidGrouping<__GroupByClause>>::IsAggregate>>::Output

Is this expression aggregate? Read more
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impl<T, U, QS> AppearsOnTable<QS> for In<T, U>where In<T, U>: Expression, T: AppearsOnTable<QS>, U: AppearsOnTable<QS>,

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impl<T: Copy, U: Copy> Copy for In<T, U>

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impl<T, U, QS> SelectableExpression<QS> for In<T, U>where In<T, U>: AppearsOnTable<QS>, T: SelectableExpression<QS>, U: SelectableExpression<QS>,

Auto Trait Implementations§

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impl<T, U> RefUnwindSafe for In<T, U>where T: RefUnwindSafe, U: RefUnwindSafe,

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impl<T, U> Send for In<T, U>where T: Send, U: Send,

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impl<T, U> Sync for In<T, U>where T: Sync, U: Sync,

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impl<T, U> Unpin for In<T, U>where T: Unpin, U: Unpin,

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impl<T, U> UnwindSafe for In<T, U>where T: UnwindSafe, U: UnwindSafe,

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T, ST> AsExpression<ST> for Twhere T: Expression<SqlType = ST>, ST: SqlType + TypedExpressionType,

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type Expression = T

The expression being returned
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fn as_expression(self) -> T

Perform the conversion
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<Conn, DB, T> ExecuteDsl<Conn, DB> for Twhere Conn: Connection<Backend = DB>, DB: Backend, T: QueryFragment<DB, NotSpecialized> + QueryId,

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fn execute(query: T, conn: &mut Conn) -> Result<usize, Error>

Execute this command
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoSql for T

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fn into_sql<T>(self) -> AsExprOf<Self, T>where Self: AsExpression<T> + Sized, T: SqlType + TypedExpressionType,

Convert self to an expression for Diesel’s query builder. Read more
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fn as_sql<'a, T>(&'a self) -> AsExprOf<&'a Self, T>where &'a Self: AsExpression<T>, T: SqlType + TypedExpressionType,

Convert &self to an expression for Diesel’s query builder. Read more
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impl<T> NullableExpressionMethods for Twhere T: Expression,

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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
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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 more
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impl<T> PgExpressionMethods for Twhere T: Expression,

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fn is_not_distinct_from<T>(self, other: T) -> IsNotDistinctFrom<Self, T>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>,

Creates a PostgreSQL IS NOT DISTINCT FROM expression. Read more
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fn is_distinct_from<T>(self, other: T) -> IsDistinctFrom<Self, T>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>,

Creates a PostgreSQL IS DISTINCT FROM expression. Read more
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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.