pub struct star;Expand description
Represents table_name.*, which is sometimes needed for
efficient count queries. It cannot be used in place of
all_columns, and has a SqlType of () to prevent it
being used that way
Trait Implementations§
source§impl Expression for star
impl Expression for star
§type SqlType = NotSelectable
type SqlType = NotSelectable
The type that this expression represents in SQL
source§impl<DB: Backend> QueryFragment<DB, NotSpecialized> for starwhere
<table as QuerySource>::FromClause: QueryFragment<DB>,
impl<DB: Backend> QueryFragment<DB, NotSpecialized> for starwhere <table as QuerySource>::FromClause: QueryFragment<DB>,
source§fn walk_ast<'b>(
&'b self,
__diesel_internal_out: AstPass<'_, 'b, DB>
) -> QueryResult<()>
fn walk_ast<'b>( &'b self, __diesel_internal_out: AstPass<'_, 'b, DB> ) -> QueryResult<()>
Walk over this
QueryFragment for all passes. Read moresource§fn to_sql(
&self,
out: &mut <DB as Backend>::QueryBuilder,
backend: &DB
) -> Result<(), Error>
fn to_sql( &self, out: &mut <DB as Backend>::QueryBuilder, backend: &DB ) -> Result<(), Error>
Converts this
QueryFragment to its SQL representation. Read moresource§fn collect_binds<'b>(
&'b self,
out: &mut <DB as HasBindCollector<'b>>::BindCollector,
metadata_lookup: &mut <DB as TypeMetadata>::MetadataLookup,
backend: &'b DB
) -> Result<(), Error>
fn collect_binds<'b>( &'b self, out: &mut <DB as HasBindCollector<'b>>::BindCollector, metadata_lookup: &mut <DB as TypeMetadata>::MetadataLookup, backend: &'b DB ) -> Result<(), Error>
Serializes all bind parameters in this query. Read more
source§impl QueryId for star
impl QueryId for star
source§const HAS_STATIC_QUERY_ID: bool = true
const HAS_STATIC_QUERY_ID: bool = true
Can the SQL generated by
Self be uniquely identified by its type? Read moresource§impl<__GB> ValidGrouping<__GB> for starwhere
(id, key, value): ValidGrouping<__GB>,
impl<__GB> ValidGrouping<__GB> for starwhere (id, key, value): ValidGrouping<__GB>,
§type IsAggregate = <(id, key, value) as ValidGrouping<__GB>>::IsAggregate
type IsAggregate = <(id, key, value) as ValidGrouping<__GB>>::IsAggregate
Is this expression aggregate? Read more
impl AppearsOnTable<table> for star
impl Copy for star
impl SelectableExpression<table> for star
Auto Trait Implementations§
impl RefUnwindSafe for star
impl Send for star
impl Sync for star
impl Unpin for star
impl UnwindSafe for star
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<Conn, DB, T> ExecuteDsl<Conn, DB> for Twhere
Conn: AsyncConnection<Backend = DB>,
DB: Backend,
T: QueryFragment<DB, NotSpecialized> + QueryId + Send,
impl<Conn, DB, T> ExecuteDsl<Conn, DB> for Twhere Conn: AsyncConnection<Backend = DB>, DB: Backend, T: QueryFragment<DB, NotSpecialized> + QueryId + Send,
source§fn execute<'query, 'conn>(
query: T,
conn: &'conn mut Conn
) -> <Conn as AsyncConnection>::ExecuteFuture<'conn, 'query>where
T: 'query,
fn execute<'query, 'conn>( query: T, conn: &'conn mut Conn ) -> <Conn as AsyncConnection>::ExecuteFuture<'conn, 'query>where T: 'query,
Execute this command
source§impl<Conn, DB, T> ExecuteDsl<Conn, DB> for Twhere
Conn: Connection<Backend = DB>,
DB: Backend,
T: QueryFragment<DB, NotSpecialized> + QueryId,
impl<Conn, DB, T> ExecuteDsl<Conn, DB> for Twhere Conn: Connection<Backend = DB>, DB: Backend, T: QueryFragment<DB, NotSpecialized> + QueryId,
source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoSql for T
impl<T> IntoSql for T
source§fn into_sql<T>(self) -> Self::Expressionwhere
Self: AsExpression<T> + Sized,
T: SqlType + TypedExpressionType,
fn into_sql<T>(self) -> Self::Expressionwhere Self: AsExpression<T> + Sized, T: SqlType + TypedExpressionType,
Convert
self to an expression for Diesel’s query builder. Read moresource§fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expressionwhere
&'a Self: AsExpression<T>,
T: SqlType + TypedExpressionType,
fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expressionwhere &'a Self: AsExpression<T>, T: SqlType + TypedExpressionType,
Convert
&self to an expression for Diesel’s query builder. Read moresource§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
) -> Grouped<IsNotDistinctFrom<Self, <T as AsExpression<Self::SqlType>>::Expression>>where
Self::SqlType: SqlType,
T: AsExpression<Self::SqlType>,
fn is_not_distinct_from<T>( self, other: T ) -> Grouped<IsNotDistinctFrom<Self, <T as AsExpression<Self::SqlType>>::Expression>>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>,
Creates a PostgreSQL
IS NOT DISTINCT FROM expression. Read moresource§fn is_distinct_from<T>(
self,
other: T
) -> Grouped<IsDistinctFrom<Self, <T as AsExpression<Self::SqlType>>::Expression>>where
Self::SqlType: SqlType,
T: AsExpression<Self::SqlType>,
fn is_distinct_from<T>( self, other: T ) -> Grouped<IsDistinctFrom<Self, <T as AsExpression<Self::SqlType>>::Expression>>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>,
Creates a PostgreSQL
IS DISTINCT FROM expression. Read moresource§impl<T> PgTrgmExpressionMethods for Twhere
T: Expression,
impl<T> PgTrgmExpressionMethods for Twhere T: Expression,
source§fn fuzzy<U>(self, right: U) -> PgTrgmFuzzy<Self, U::Expression>where
Self::SqlType: SqlType,
U: AsExpression<Self::SqlType>,
fn fuzzy<U>(self, right: U) -> PgTrgmFuzzy<Self, U::Expression>where Self::SqlType: SqlType, U: AsExpression<Self::SqlType>,
source§impl<T, Conn> RunQueryDsl<Conn> for T
impl<T, Conn> RunQueryDsl<Conn> for T
source§fn execute<'query, 'conn>(
self,
conn: &'conn mut Conn
) -> <Conn as AsyncConnection>::ExecuteFuture<'conn, 'query>where
Conn: AsyncConnection + Send,
Self: ExecuteDsl<Conn, <Conn as AsyncConnection>::Backend> + 'query,
fn execute<'query, 'conn>( self, conn: &'conn mut Conn ) -> <Conn as AsyncConnection>::ExecuteFuture<'conn, 'query>where Conn: AsyncConnection + Send, Self: ExecuteDsl<Conn, <Conn as AsyncConnection>::Backend> + 'query,
Executes the given command, returning the number of rows affected. Read more
source§fn load<'query, U, 'conn>(
self,
conn: &'conn mut Conn
) -> AndThen<Self::LoadFuture<'conn>, TryCollect<Self::Stream<'conn>, Vec<U, Global>>, fn(_: Self::Stream<'conn>) -> TryCollect<Self::Stream<'conn>, Vec<U, Global>>>where
U: Send,
Conn: AsyncConnection,
Self: LoadQuery<'query, Conn, U> + 'query,
fn load<'query, U, 'conn>( self, conn: &'conn mut Conn ) -> AndThen<Self::LoadFuture<'conn>, TryCollect<Self::Stream<'conn>, Vec<U, Global>>, fn(_: Self::Stream<'conn>) -> TryCollect<Self::Stream<'conn>, Vec<U, Global>>>where U: Send, Conn: AsyncConnection, Self: LoadQuery<'query, Conn, U> + 'query,
source§fn load_stream<'conn, 'query, U>(
self,
conn: &'conn mut Conn
) -> Self::LoadFuture<'conn>where
Conn: AsyncConnection,
U: 'conn,
Self: LoadQuery<'query, Conn, U> + 'query,
fn load_stream<'conn, 'query, U>( self, conn: &'conn mut Conn ) -> Self::LoadFuture<'conn>where Conn: AsyncConnection, U: 'conn, Self: LoadQuery<'query, Conn, U> + 'query,
source§fn get_result<'query, 'conn, U>(
self,
conn: &'conn mut Conn
) -> AndThen<Self::LoadFuture<'conn>, Map<StreamFuture<Pin<Box<Self::Stream<'conn>, Global>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<Self::Stream<'conn>, Global>>)) -> Result<U, Error>>, fn(_: Self::Stream<'conn>) -> Map<StreamFuture<Pin<Box<Self::Stream<'conn>, Global>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<Self::Stream<'conn>, Global>>)) -> Result<U, Error>>>where
U: Send + 'conn,
Conn: AsyncConnection,
Self: LoadQuery<'query, Conn, U> + 'query,
fn get_result<'query, 'conn, U>( self, conn: &'conn mut Conn ) -> AndThen<Self::LoadFuture<'conn>, Map<StreamFuture<Pin<Box<Self::Stream<'conn>, Global>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<Self::Stream<'conn>, Global>>)) -> Result<U, Error>>, fn(_: Self::Stream<'conn>) -> Map<StreamFuture<Pin<Box<Self::Stream<'conn>, Global>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<Self::Stream<'conn>, Global>>)) -> Result<U, Error>>>where U: Send + 'conn, Conn: AsyncConnection, Self: LoadQuery<'query, Conn, U> + 'query,
Runs the command, and returns the affected row. Read more
source§fn get_results<'query, U, 'conn>(
self,
conn: &'conn mut Conn
) -> AndThen<Self::LoadFuture<'conn>, TryCollect<Self::Stream<'conn>, Vec<U, Global>>, fn(_: Self::Stream<'conn>) -> TryCollect<Self::Stream<'conn>, Vec<U, Global>>>where
U: Send,
Conn: AsyncConnection,
Self: LoadQuery<'query, Conn, U> + 'query,
fn get_results<'query, U, 'conn>( self, conn: &'conn mut Conn ) -> AndThen<Self::LoadFuture<'conn>, TryCollect<Self::Stream<'conn>, Vec<U, Global>>, fn(_: Self::Stream<'conn>) -> TryCollect<Self::Stream<'conn>, Vec<U, Global>>>where U: Send, Conn: AsyncConnection, Self: LoadQuery<'query, Conn, U> + 'query,
Runs the command, returning an
Vec with the affected rows. Read moresource§fn first<'query, 'conn, U>(
self,
conn: &'conn mut Conn
) -> AndThen<<Self::Output as LoadQuery<'query, Conn, U>>::LoadFuture<'conn>, Map<StreamFuture<Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>, Global>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>, Global>>)) -> Result<U, Error>>, fn(_: <Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>) -> Map<StreamFuture<Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>, Global>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>, Global>>)) -> Result<U, Error>>>where
U: Send + 'conn,
Conn: AsyncConnection,
Self: LimitDsl,
Self::Output: LoadQuery<'query, Conn, U> + Send + 'query,
fn first<'query, 'conn, U>( self, conn: &'conn mut Conn ) -> AndThen<<Self::Output as LoadQuery<'query, Conn, U>>::LoadFuture<'conn>, Map<StreamFuture<Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>, Global>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>, Global>>)) -> Result<U, Error>>, fn(_: <Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>) -> Map<StreamFuture<Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>, Global>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>, Global>>)) -> Result<U, Error>>>where U: Send + 'conn, Conn: AsyncConnection, Self: LimitDsl, Self::Output: LoadQuery<'query, Conn, U> + Send + 'query,
Attempts to load a single record. Read more