pub struct Many<ST, I> {
    pub values: Vec<I>,
    /* private fields */
}
Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.
Expand description

Query dsl node for an IN (values) clause containing a variable number of bind values.

Third party backend can customize the QueryFragment implementation of this query dsl node via SqlDialect::ArrayComparison. The default implementation does generate one bind per value in the values field.

Diesel provides an optimized implementation for Postgresql like database systems that bind all values with one bind value of the type Array<ST> instead.

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§values: Vec<I>

The values contained in the IN (values) clause

Trait Implementations§

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impl<ST: Clone, I: Clone> Clone for Many<ST, I>

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fn clone(&self) -> Many<ST, I>

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<ST: Debug, I: Debug> Debug for Many<ST, I>

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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<ST, I> Expression for Many<ST, I>where ST: TypedExpressionType,

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type SqlType = ST

The type that this expression represents in SQL
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impl<ST, I> MaybeEmpty for Many<ST, I>

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fn is_empty(&self) -> bool

Returns true if self represents an empty collection Otherwise false is returned.
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impl<ST, I, DB> QueryFragment<DB> for Many<ST, I>where Self: QueryFragment<DB, DB::ArrayComparison>, DB: Backend,

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fn walk_ast<'b>(&'b self, pass: 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::BindCollector<'b>, 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<ST, I, DB> QueryFragment<DB, AnsiSqlArrayComparison> for Many<ST, I>where DB: Backend + HasSqlType<ST> + SqlDialect<ArrayComparison = AnsiSqlArrayComparison>, ST: SingleValue, I: ToSql<ST, DB>,

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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::BindCollector<'b>, 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<ST, I> QueryId for Many<ST, I>

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type QueryId = ()

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

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<ST, I, GB> ValidGrouping<GB> for Many<ST, I>where ST: SingleValue, I: AsExpression<ST>, I::Expression: ValidGrouping<GB>,

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type IsAggregate = <<I as AsExpression<ST>>::Expression as ValidGrouping<GB>>::IsAggregate

Is this expression aggregate? Read more
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impl<ST, I, QS> AppearsOnTable<QS> for Many<ST, I>where Many<ST, I>: Expression, I: AsExpression<ST>, ST: SingleValue, <I as AsExpression<ST>>::Expression: SelectableExpression<QS>,

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impl<ST, I, QS> SelectableExpression<QS> for Many<ST, I>where Many<ST, I>: AppearsOnTable<QS>, ST: SingleValue, I: AsExpression<ST>, <I as AsExpression<ST>>::Expression: SelectableExpression<QS>,

Auto Trait Implementations§

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impl<ST, I> RefUnwindSafe for Many<ST, I>where I: RefUnwindSafe, ST: RefUnwindSafe,

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impl<ST, I> Send for Many<ST, I>where I: Send, ST: Send,

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impl<ST, I> Sync for Many<ST, I>where I: Sync, ST: Sync,

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impl<ST, I> Unpin for Many<ST, I>where I: Unpin, ST: Unpin,

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impl<ST, I> UnwindSafe for Many<ST, I>where I: UnwindSafe, ST: 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> + 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>,

Available on crate feature postgres_backend only.
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>,

Available on crate feature postgres_backend only.
Creates a PostgreSQL IS DISTINCT FROM expression. Read more
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impl<T> SqliteExpressionMethods for Twhere T: Expression,

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fn is<T>(self, other: T) -> Is<Self, T>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>,

Available on crate feature sqlite only.
Creates a Sqlite IS expression. Read more
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fn is_not<T>(self, other: T) -> IsNot<Self, T>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>,

Available on crate feature sqlite only.
Creates a Sqlite IS NOT 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.
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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V