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>,

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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

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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

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type SqlType = Timestamp

The type that this expression represents in SQL
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impl QueryId for now

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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>,

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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

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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§

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impl RefUnwindSafe for now

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impl Send for now

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impl Sync for now

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impl Unpin for now

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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,

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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, 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> ExpressionMethods for Twhere T: Expression, <T as Expression>::SqlType: SingleValue,

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fn eq<T>(self, other: T) -> Eq<Self, T>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>,

Creates a SQL = expression. Read more
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fn ne<T>(self, other: T) -> NotEq<Self, T>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>,

Creates a SQL != expression. Read more
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fn eq_any<T>(self, values: T) -> EqAny<Self, T>where Self::SqlType: SqlType, T: AsInExpression<Self::SqlType>,

Creates a SQL IN statement. Read more
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fn ne_all<T>(self, values: T) -> NeAny<Self, T>where Self::SqlType: SqlType, T: AsInExpression<Self::SqlType>,

Creates a SQL NOT IN statement. Read more
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fn is_null(self) -> IsNull<Self>

Creates a SQL IS NULL expression. Read more
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fn is_not_null(self) -> IsNotNull<Self>

Creates a SQL IS NOT NULL expression. Read more
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fn gt<T>(self, other: T) -> Gt<Self, T>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>,

Creates a SQL > expression. Read more
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fn ge<T>(self, other: T) -> GtEq<Self, T>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>,

Creates a SQL >= expression. Read more
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fn lt<T>(self, other: T) -> Lt<Self, T>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>,

Creates a SQL < expression. Read more
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fn le<T>(self, other: T) -> LtEq<Self, T>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>,

Creates a SQL <= expression. Read more
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fn between<T, U>(self, lower: T, upper: U) -> Between<Self, T, U>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>, U: AsExpression<Self::SqlType>,

Creates a SQL BETWEEN expression using the given lower and upper bounds. Read more
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fn not_between<T, U>(self, lower: T, upper: U) -> NotBetween<Self, T, U>where Self::SqlType: SqlType, T: AsExpression<Self::SqlType>, U: AsExpression<Self::SqlType>,

Creates a SQL NOT BETWEEN expression using the given lower and upper bounds. Read more
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fn desc(self) -> Desc<Self>

Creates a SQL DESC expression, representing this expression in descending order. Read more
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fn asc(self) -> Asc<Self>

Creates a SQL ASC expression, representing this expression in ascending order. Read more
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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> 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<T> NonAggregate for Twhere T: ValidGrouping<()>, <T as ValidGrouping<()>>::IsAggregate: MixedAggregates<No, Output = No>,