Struct diesel::dsl::now

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pub struct now;

Expand description

Represents the SQL CURRENT_TIMESTAMP constant. This is equivalent to the NOW() function on backends that support it.

Trait Implementations

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impl<Rhs> Add<Rhs> for now where
Rhs: AsExpression<<<now as Expression>::SqlType as Add>::Rhs>,

type Output = Add<now, <Rhs as AsExpression<<<now as Expression>::SqlType as Add>::Rhs>>::Expression>

The resulting type after applying the + operator.

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fn add(self, rhs: Rhs) -> Self::Output

Performs the + operation. Read more

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impl AsExpression<Nullable<Timestamp>> for now

type Expression = Coerce<now, Nullable<Timestamp>>

The expression being returned

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fn as_expression(self) -> Self::Expression

Perform the conversion

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impl Clone for now

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fn clone(&self) -> now

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 Debug for now

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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 Expression for now

type SqlType = Timestamp

The type that this expression represents in SQL

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impl<DB: Backend> QueryFragment<DB> for now

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

Walk over this QueryFragment for all passes. Read more

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fn to_sql(&self, out: &mut DB::QueryBuilder) -> QueryResult<()>

Converts this QueryFragment to its SQL representation. Read more

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fn collect_binds(
 &self,
 out: &mut DB::BindCollector,
 metadata_lookup: &DB::MetadataLookup
) -> QueryResult<()>

Serializes all bind parameters in this query. Read more

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fn is_safe_to_cache_prepared(&self) -> QueryResult<bool>

Is this query safe to store in the prepared statement cache? Read more

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impl QueryId for now

type QueryId = now

A type which uniquely represents Self in a SQL query. Read more

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const HAS_STATIC_QUERY_ID: bool = true

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<Rhs> Sub<Rhs> for now where
Rhs: AsExpression<<<now as Expression>::SqlType as Sub>::Rhs>,

type Output = Sub<now, <Rhs as AsExpression<<<now as Expression>::SqlType as Sub>::Rhs>>::Expression>

The resulting type after applying the - operator.

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fn sub(self, rhs: Rhs) -> Self::Output

Performs the - operation. Read more

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impl<QS> SelectableExpression<QS> for now where
now: AppearsOnTable<QS>,

Auto Trait Implementations

impl RefUnwindSafe for now

impl Send for now

impl Sync for now

impl Unpin for now

impl UnwindSafe for now

Blanket Implementations

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impl<T> Any for T where
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> Borrow<T> for T where
T: ?Sized,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

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 T where
 Conn: Connection<Backend = DB>,
 DB: Backend,
 T: QueryFragment<DB> + QueryId,

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

Execute this command

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source

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,

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>,

Convert &self to an expression for Diesel’s query builder. Read more

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impl<T> ToOwned for T where
T: Clone,

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 for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

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Struct diesel::dsl::now

Trait Implementations

impl<Rhs> Add<Rhs> for now where Rhs: AsExpression<<<now as Expression>::SqlType as Add>::Rhs>,

type Output = Add<now, <Rhs as AsExpression<<<now as Expression>::SqlType as Add>::Rhs>>::Expression>

fn add(self, rhs: Rhs) -> Self::Output

impl AsExpression<Nullable<Timestamp>> for now

type Expression = Coerce<now, Nullable<Timestamp>>

fn as_expression(self) -> Self::Expression

impl Clone for now

fn clone(&self) -> now

fn clone_from(&mut self, source: &Self)

impl Debug for now

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

impl Expression for now

type SqlType = Timestamp

impl<DB: Backend> QueryFragment<DB> for now

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

fn to_sql(&self, out: &mut DB::QueryBuilder) -> QueryResult<()>

fn collect_binds( &self, out: &mut DB::BindCollector, metadata_lookup: &DB::MetadataLookup) -> QueryResult<()>

fn is_safe_to_cache_prepared(&self) -> QueryResult<bool>

impl QueryId for now

type QueryId = now

const HAS_STATIC_QUERY_ID: bool = true

fn query_id() -> Option<TypeId>

impl<Rhs> Sub<Rhs> for now where Rhs: AsExpression<<<now as Expression>::SqlType as Sub>::Rhs>,

type Output = Sub<now, <Rhs as AsExpression<<<now as Expression>::SqlType as Sub>::Rhs>>::Expression>

fn sub(self, rhs: Rhs) -> Self::Output

impl<QS> AppearsOnTable<QS> for now where now: Expression,

impl Copy for now

impl NonAggregate for now

impl<QS> SelectableExpression<QS> for now where now: AppearsOnTable<QS>,

Auto Trait Implementations

impl RefUnwindSafe for now

impl Send for now

impl Sync for now

impl Unpin for now

impl UnwindSafe for now

Blanket Implementations

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

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

impl<Conn, DB, T> ExecuteDsl<Conn, DB> for T where Conn: Connection<Backend = DB>, DB: Backend, T: QueryFragment<DB> + QueryId,

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

impl<T> IntoSql for T

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

fn as_sql<'a, T>(&'a self) -> AsExprOf<&'a Self, T> where &'a Self: AsExpression<T>,

impl<T> ToOwned for T where T: Clone,

type Owned = T

fn to_owned(&self) -> T

fn clone_into(&self, target: &mut T)

impl<T, U> TryFrom<U> for T where U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

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

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

impl<QS, T, DB> BoxableExpression<QS, DB> for T where DB: Backend, T: Expression + SelectableExpression<QS> + NonAggregate + QueryFragment<DB>,

impl<Rhs> Add<Rhs> for now where
Rhs: AsExpression<<<now as Expression>::SqlType as Add>::Rhs>,

fn collect_binds(
&self,
out: &mut DB::BindCollector,
metadata_lookup: &DB::MetadataLookup
) -> QueryResult<()>

impl<Rhs> Sub<Rhs> for now where
Rhs: AsExpression<<<now as Expression>::SqlType as Sub>::Rhs>,

impl<QS> AppearsOnTable<QS> for now where
now: Expression,

impl<QS> SelectableExpression<QS> for now where
now: AppearsOnTable<QS>,

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

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

impl<Conn, DB, T> ExecuteDsl<Conn, DB> for T where
Conn: Connection<Backend = DB>,
DB: Backend,
T: QueryFragment<DB> + QueryId,

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

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

fn as_sql<'a, T>(&'a self) -> AsExprOf<&'a Self, T> where
&'a Self: AsExpression<T>,

impl<T> ToOwned for T where
T: Clone,

impl<T, U> TryFrom<U> for T where
U: Into<T>,

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

impl<QS, T, DB> BoxableExpression<QS, DB> for T where
DB: Backend,
T: Expression + SelectableExpression<QS> + NonAggregate + QueryFragment<DB>,