Struct diesel::expression::array_comparison::Many
source · 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.
Fields§
§values: Vec<I>
The values contained in the IN (values)
clause
Trait Implementations§
source§impl<ST, I> Expression for Many<ST, I>where
ST: TypedExpressionType,
impl<ST, I> Expression for Many<ST, I>where
ST: TypedExpressionType,
source§impl<ST, I> MaybeEmpty for Many<ST, I>
impl<ST, I> MaybeEmpty for Many<ST, I>
source§impl<ST, I, DB> QueryFragment<DB> for Many<ST, I>
impl<ST, I, DB> QueryFragment<DB> for Many<ST, I>
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<ST, I, DB> QueryFragment<DB, AnsiSqlArrayComparison> for Many<ST, I>where
DB: Backend + HasSqlType<ST> + SqlDialect<ArrayComparison = AnsiSqlArrayComparison>,
ST: SingleValue,
I: ToSql<ST, DB>,
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>,
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<ST, I> QueryId for Many<ST, I>
impl<ST, I> QueryId for Many<ST, I>
source§const HAS_STATIC_QUERY_ID: bool = false
const HAS_STATIC_QUERY_ID: bool = false
Can the SQL generated by
Self
be uniquely identified by its type? Read moresource§impl<ST, I, GB> ValidGrouping<GB> for Many<ST, I>
impl<ST, I, GB> ValidGrouping<GB> for Many<ST, I>
source§type IsAggregate = <<I as AsExpression<ST>>::Expression as ValidGrouping<GB>>::IsAggregate
type IsAggregate = <<I as AsExpression<ST>>::Expression as ValidGrouping<GB>>::IsAggregate
Is this expression aggregate? Read more
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>,
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§
impl<ST, I> Freeze for Many<ST, I>
impl<ST, I> RefUnwindSafe for Many<ST, I>where
ST: RefUnwindSafe,
I: RefUnwindSafe,
impl<ST, I> Send for Many<ST, I>
impl<ST, I> Sync for Many<ST, I>
impl<ST, I> Unpin for Many<ST, I>
impl<ST, I> UnwindSafe for Many<ST, I>where
ST: UnwindSafe,
I: 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