Struct diesel::dsl::now

[+] Show declaration

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

impl QueryId for now

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type QueryId = now

A type which uniquely represents Self in a SQL query.

const HAS_STATIC_QUERY_ID: bool

HAS_STATIC_QUERY_ID: bool = true

Can the SQL generated by Self be uniquely identified by its type?

fn query_id() -> Option<TypeId>

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Returns the type id of Self::QueryId if Self::HAS_STATIC_QUERY_ID. Returns None otherwise.

impl Debug for now

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

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Formats the value using the given formatter.

impl Copy for now

impl Clone for now

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fn clone(&self) -> now

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Returns a copy of the value.

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

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Performs copy-assignment from source.

impl Expression for now

type SqlType = Timestamp

The type that this expression represents in SQL

impl NonAggregate for now

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

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

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Walk over this QueryFragment for all passes.

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

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Converts this QueryFragment to its SQL representation.

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

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Serializes all bind parameters in this query.

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

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

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

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

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

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type Output = Add<Self, Rhs::Expression>

The resulting type after applying the + operator.

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

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Performs the + operation.

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

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type Output = Sub<Self, Rhs::Expression>

The resulting type after applying the - operator.

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

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Performs the - operation.

impl AsExpression<Timestamptz> for now

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type Expression = Coerce<now, Timestamptz>

The expression being returned

fn as_expression(self) -> Self::Expression

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Perform the conversion

impl AsExpression<Nullable<Timestamptz>> for now

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

The expression being returned

fn as_expression(self) -> Self::Expression

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Perform the conversion