diesel::dsl

Struct 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.

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impl<Rhs> Add<Rhs> for now
where 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, 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 AsExpression<Nullable<Timestamptz>> for now

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

The expression being returned
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fn as_expression(self) -> Self::Expression

Perform the conversion
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impl AsExpression<Timestamptz> for now

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type Expression = Coerce<now, Timestamptz>

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<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

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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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type QueryId = now

A type which uniquely represents Self in a SQL query. 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>,

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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, rhs: Rhs) -> Self::Output

Performs the - operation. Read more
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impl<QS> AppearsOnTable<QS> for now
where now: Expression,

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impl Copy for now

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impl NonAggregate for now

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

Auto Trait Implementations§

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impl Freeze for now

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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 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> AsExpression<<T as Expression>::SqlType> for T
where T: Expression,

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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 T
where 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 T
where 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<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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> ExpressionMethods for T
where T: Expression, <T as Expression>::SqlType: SingleValue,

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

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

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

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

👎Deprecated since 1.2.0: use ne_all instead
Deprecated alias for ne_all Read more
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fn ne_all<T>(self, values: T) -> NotIn<Self, T::InExpression>
where 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: AsExpression<Self::SqlType>>(self, other: T) -> Gt<Self, T::Expression>

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

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

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

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

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> NullableExpressionMethods for T
where 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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impl<T> PgExpressionMethods for T
where T: Expression,

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fn is_not_distinct_from<T>( self, other: T, ) -> IsNotDistinctFrom<Self, T::Expression>
where T: AsExpression<Self::SqlType>,

Creates a PostgreSQL IS NOT DISTINCT FROM expression. Read more
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fn is_distinct_from<T>(self, other: T) -> IsDistinctFrom<Self, T::Expression>
where T: AsExpression<Self::SqlType>,

Creates a PostgreSQL IS DISTINCT FROM expression. Read more
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impl<T> PgTimestampExpressionMethods for T
where T: Expression, <T as Expression>::SqlType: DateTimeLike,

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fn at_time_zone<T>(self, timezone: T) -> AtTimeZone<Self, T::Expression>
where T: AsExpression<VarChar>,

Creates a PostgreSQL “AT TIME ZONE” expression. Read more
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impl<T> ToOwned for T
where 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 T
where 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 T
where 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<QS, T, DB> BoxableExpression<QS, DB> for T
where DB: Backend, T: Expression + SelectableExpression<QS> + NonAggregate + QueryFragment<DB>,