Trait rocket_db_pools::diesel::prelude::PgTimestampExpressionMethods

pub trait PgTimestampExpressionMethods: Sized + Expression {
    // Provided method
    fn at_time_zone<T>(
        self,
        timezone: T,
    ) -> Grouped<AtTimeZone<Self, <T as AsExpression<Text>>::Expression>>
       where T: AsExpression<Text> { ... }
}

PostgreSQL specific methods present on timestamp expressions.

Provided Methods

fn at_time_zone<T>( self, timezone: T, ) -> Grouped<AtTimeZone<Self, <T as AsExpression<Text>>::Expression>>

where T: AsExpression<Text>,

Creates a PostgreSQL “AT TIME ZONE” expression.

When this is called on a TIMESTAMP WITHOUT TIME ZONE column, the value will be treated as if were in the given time zone, and then converted to UTC.

When this is called on a TIMESTAMP WITH TIME ZONE column, the value will be converted to the given time zone, and then have its time zone information removed.

Example

let christmas_morning = NaiveDate::from_ymd(2017, 12, 25)
    .and_hms(8, 0, 0);
diesel::insert_into(timestamps)
    .values(timestamp.eq(christmas_morning))
    .execute(connection)?;

let utc_time = timestamps
    .select(timestamp.at_time_zone("UTC"))
    .first(connection)?;
assert_eq!(christmas_morning, utc_time);

let eastern_time = timestamps
    .select(timestamp.at_time_zone("EST"))
    .first(connection)?;
let five_hours_later = christmas_morning + Duration::hours(5);
assert_eq!(five_hours_later, eastern_time);

Object Safety

This trait is not object safe.

Implementors

impl<T> PgTimestampExpressionMethods for T

where T: Expression, <T as Expression>::SqlType: DateTimeLike,