Struct mz_repr::adt::interval::Interval

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pub struct Interval {
    pub months: i32,
    pub days: i32,
    pub micros: i64,
}
Expand description

An interval of time meant to express SQL intervals.

Obtained by parsing an INTERVAL '<value>' <unit> [TO <precision>].

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§months: i32

A possibly negative number of months for field types like YEAR

§days: i32

A possibly negative number of days.

Irrespective of values, days will not be carried over into months.

§micros: i64

A timespan represented in microseconds.

Irrespective of values, micros will not be carried over into days or months.

Implementations§

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impl Interval

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pub const CENTURY_PER_MILLENNIUM: u16 = 10u16

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pub const DECADE_PER_CENTURY: u16 = 10u16

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pub const YEAR_PER_DECADE: u16 = 10u16

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pub const MONTH_PER_YEAR: u16 = 12u16

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pub const DAY_PER_MONTH: u16 = 30u16

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pub const HOUR_PER_DAY: u16 = 24u16

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pub const MINUTE_PER_HOUR: u16 = 60u16

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pub const SECOND_PER_MINUTE: u16 = 60u16

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pub const MILLISECOND_PER_SECOND: u16 = 1_000u16

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pub const MICROSECOND_PER_MILLISECOND: u16 = 1_000u16

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pub const NANOSECOND_PER_MICROSECOND: u16 = 1_000u16

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pub const EPOCH_DAYS_PER_YEAR: f64 = 365.25f64

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pub fn new(months: i32, days: i32, micros: i64) -> Interval

Constructs a new Interval with the specified units of time.

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pub fn from_duration(duration: Duration) -> Result<Interval, Error>

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pub fn checked_add(&self, other: &Self) -> Option<Self>

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pub fn checked_mul(&self, other: f64) -> Option<Self>

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pub fn checked_div(&self, other: f64) -> Option<Self>

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pub fn millennia(&self) -> i32

Computes the millennium part of the interval.

The millennium part is the number of whole millennia in the interval. For example, this function returns 3 for the interval 3400 years.

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pub fn centuries(&self) -> i32

Computes the century part of the interval.

The century part is the number of whole centuries in the interval. For example, this function returns 3 for the interval 340 years.

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pub fn decades(&self) -> i32

Computes the decade part of the interval.

The decade part is the number of whole decades in the interval. For example, this function returns 3 for the interval 34 years.

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pub fn years(&self) -> i32

Computes the year part of the interval.

The year part is the number of whole years in the interval. For example, this function returns 3 for the interval 3 years 4 months.

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pub fn quarters(&self) -> i32

Computes the quarter part of the interval.

The quarter part is obtained from taking the number of whole months modulo 12, and assigning quarter #1 for months 0-2, #2 for 3-5, #3 for 6-8 and #4 for 9-11. For example, this function returns 4 for the interval 11 months.

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pub fn months(&self) -> i32

Computes the month part of the interval.

The month part is the number of whole months in the interval, modulo 12. For example, this function returns 4 for the interval 3 years 4 months.

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pub fn days(&self) -> i64

Computes the day part of the interval.

The day part is the number of whole days in the interval. For example, this function returns 5 for the interval 5 days 4 hours 3 minutes 2.1 seconds.

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pub fn hours(&self) -> i64

Computes the hour part of the interval.

The hour part is the number of whole hours in the interval, modulo 24. For example, this function returns 4 for the interval 5 days 4 hours 3 minutes 2.1 seconds.

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pub fn minutes(&self) -> i64

Computes the minute part of the interval.

The minute part is the number of whole minutes in the interval, modulo 60. For example, this function returns 3 for the interval 5 days 4 hours 3 minutes 2.1 seconds.

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pub fn seconds<T>(&self) -> T
where T: DecimalLike,

Computes the second part of the interval.

The second part is the number of fractional seconds in the interval, modulo 60.0.

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pub fn milliseconds<T>(&self) -> T
where T: DecimalLike,

Computes the second part of the interval displayed in milliseconds.

The second part is the number of fractional seconds in the interval, modulo 60.0.

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pub fn microseconds<T>(&self) -> T
where T: DecimalLike,

Computes the second part of the interval displayed in microseconds.

The second part is the number of fractional seconds in the interval, modulo 60.0.

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pub fn nanoseconds(&self) -> i32

Computes the nanosecond part of the interval.

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pub fn as_epoch_seconds<T>(&self) -> T
where T: DecimalLike,

Computes the total number of epoch seconds in the interval. When extracting an epoch, PostgreSQL considers a year 365.25 days.

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pub fn as_microseconds(&self) -> i128

Computes the total number of microseconds in the interval.

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pub fn as_milliseconds(&self) -> i128

Computes the total number of milliseconds in the interval. Discards fractional milliseconds!

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pub fn duration_as_chrono(&self) -> Duration

Converts this Interval’s duration into chrono::Duration.

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pub fn duration(&self) -> Result<Duration, Error>

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pub fn truncate_high_fields(&mut self, f: DateTimeField)

Truncate the “head” of the interval, removing all time units greater than f.

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pub fn truncate_low_fields( &mut self, f: DateTimeField, fsec_max_precision: Option<u64>, round_behavior: RoundBehavior ) -> Result<(), Error>

Truncate the “tail” of the interval, removing all time units less than f.

§Arguments
  • f: Round the interval down to the specified time unit.
  • fsec_max_precision: If Some(x), keep only x places of microsecond precision. Must be (0,6).
§Errors
  • If fsec_max_precision is not None or within (0,6).
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pub fn as_time_interval(&self) -> Self

Returns a new Interval with only the time component

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pub fn is_negative(&self) -> bool

Returns true if combining all fields results in a negative number, false otherwise

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pub fn convert_date_time_unit<T>( source: DateTimeField, dest: DateTimeField, val: T ) -> Option<T>
where T: From<u16> + CheckedMul + DivAssign,

Convert val from source unit to dest unit. Does not maintain fractional values. Returns None if the result overflows/underflows.

WARNING: Due to the fact that Intervals consider months to have 30 days, you may get unexpected and incorrect results when trying to convert from a non-year type to a year type and vice versa. For example from years to days.

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pub fn justify_days(&self) -> Result<Self, Error>

Adjust interval so ‘days’ contains less than 30 days, adding the excess to ‘months’.

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pub fn justify_hours(&self) -> Result<Self, Error>

Adjust interval so ‘micros’ contains less than a whole day, adding the excess to ‘days’.

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pub fn justify_interval(&self) -> Result<Self, Error>

Adjust interval so ‘days’ contains less than 30 days, adding the excess to ‘months’. Adjust interval so ‘micros’ contains less than a whole day, adding the excess to ‘days’. Also, the sign bit on all three fields is made equal, so either all three fields are negative or all are positive.

Trait Implementations§

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impl Arbitrary for Interval

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type Strategy = BoxedStrategy<Interval>

The type of Strategy used to generate values of type Self.
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type Parameters = ()

The type of parameters that arbitrary_with accepts for configuration of the generated Strategy. Parameters must implement Default.
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fn arbitrary_with(_: Self::Parameters) -> Self::Strategy

Generates a Strategy for producing arbitrary values of type the implementing type (Self). The strategy is passed the arguments given in args. Read more
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fn arbitrary() -> Self::Strategy

Generates a Strategy for producing arbitrary values of type the implementing type (Self). Read more
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impl<'a> AsColumnType for Interval

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fn as_column_type() -> ColumnType

The SQL column type of this Rust type
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impl CheckedNeg for Interval

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fn checked_neg(&self) -> Option<Self>

Negates a number, returning None for results that can’t be represented, like signed MIN values that can’t be positive, or non-zero unsigned values that can’t be negative. Read more
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impl Clone for Interval

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fn clone(&self) -> Interval

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<'a, E> DatumType<'a, E> for Interval

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fn nullable() -> bool

Whether this Rust type can represent NULL values
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fn fallible() -> bool

Whether this Rust type can represent errors
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fn try_from_result( res: Result<Datum<'a>, E> ) -> Result<Self, Result<Datum<'a>, E>>

Try to convert a Result whose Ok variant is a Datum into this native Rust type (Self). If it fails the error variant will contain the original result.
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fn into_result(self, _temp_storage: &'a RowArena) -> Result<Datum<'a>, E>

Convert this Rust type into a Result containing a Datum, or an error
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impl Debug for Interval

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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 Default for Interval

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for Interval

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Display for Interval

Format an interval in a human form

Example outputs:

  • 1 year 2 months 5 days 03:04:00
  • -1 year +5 days +18:59:29.3
  • 00:00:00
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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<'a> From<Interval> for Datum<'a>

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fn from(other: Interval) -> Datum<'a>

Converts to this type from the input type.
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impl FromStr for Interval

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type Err = Error

The associated error which can be returned from parsing.
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fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type. Read more
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impl Hash for Interval

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for Interval

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fn cmp(&self, other: &Interval) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for Interval

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fn eq(&self, other: &Interval) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for Interval

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fn partial_cmp(&self, other: &Interval) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl RustType<ProtoInterval> for Interval

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fn into_proto(&self) -> ProtoInterval

Convert a Self into a Proto value.
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fn from_proto(proto: ProtoInterval) -> Result<Self, TryFromProtoError>

Consume and convert a Proto back into a Self value. Read more
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impl Serialize for Interval

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl TryFrom<Datum<'_>> for Interval

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type Error = ()

The type returned in the event of a conversion error.
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fn try_from(from: Datum<'_>) -> Result<Self, Self::Error>

Performs the conversion.
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impl Copy for Interval

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impl Eq for Interval

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impl StructuralPartialEq for Interval

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Gets the TypeId of self. Read more
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Immutably borrows from an owned value. Read more
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Performs the cast.
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fn compare(&self, key: &K) -> Ordering

Compare self to key and return their ordering.
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where R: Region<Index = (usize, usize)>, O: OffsetContainer<usize>, T: CopyOnto<R>,

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Copy self into the target container, returning an index that allows to look up the corresponding read item.
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Compare self to key and return true if they are equal.
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Checks if this value is equivalent to the given key. Read more
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