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 nowwhere
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, __diesel_internal_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 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 nowwhere
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, __diesel_internal_rhs: Rhs) -> Self::Output

Performs the - operation. Read more

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impl<GroupByClause> ValidGrouping<GroupByClause> for now

type IsAggregate = Never

Is this expression aggregate? Read more

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

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impl Copy for now

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impl<QS> SelectableExpression<QS> for nowwhere
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 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,

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,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for Twhere
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 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

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for Twhere
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,
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> ToOwned for Twhere
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 Twhere
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 Twhere
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.

Struct diesel::dsl::now

Trait Implementations

impl<Rhs> Add<Rhs> for nowwhere 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, __diesel_internal_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 QueryId for now

type QueryId = now

const HAS_STATIC_QUERY_ID: bool = true

fn query_id() -> Option<TypeId>

impl<Rhs> Sub<Rhs> for nowwhere 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, __diesel_internal_rhs: Rhs) -> Self::Output

impl<__GroupByClause> ValidGrouping<__GroupByClause> for now

type IsAggregate = Never

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

impl Copy for now

impl<QS> SelectableExpression<QS> for nowwhere 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 Twhere T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T, ST> AsExpression<ST> for Twhere T: Expression<SqlType = ST>, ST: SqlType + TypedExpressionType,

type Expression = T

fn as_expression(self) -> T

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

fn borrow(&self) -> &T

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

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

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

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

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for Twhere 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, T: SqlType + TypedExpressionType,

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

impl<T> ToOwned for Twhere T: Clone,

type Owned = T

fn to_owned(&self) -> T

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

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

type Error = Infallible

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

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

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

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

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

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

impl<GroupByClause> ValidGrouping<GroupByClause> for now

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

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

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

impl<T, ST> AsExpression<ST> for Twhere
T: Expression<SqlType = ST>,
ST: SqlType + TypedExpressionType,

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

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

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

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

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

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

impl<T> ToOwned for Twhere
T: Clone,

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

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