Enum dbgen::value::Value

pub enum Value {
    Null,
    Number(Number),
    Bytes(Bytes),
    Timestamp(NaiveDateTime, Tz),
    Interval(i64),
    // some variants omitted
}

A scalar value.

Variants

Null

Null.

Number(Number)

A number.

Bytes(Bytes)

A string or byte string.

Timestamp(NaiveDateTime, Tz)

A timestamp.

Interval(i64)

A time interval, as multiple of microseconds.

Implementations

impl Value

pub fn new_timestamp(ts: NaiveDateTime, tz: Tz) -> Self

Creates a timestamp value.

pub fn sql_cmp(
    &self,
    other: &Self,
    name: Function
) -> Result<Option<Ordering>, Error>

Compares two values using the rules common among SQL implementations.

• Comparing with NULL always return None.
• Numbers and intervals are ordered by value.
• Timestamps are ordered by its UTC value, ignoring time zone.
• Strings are ordered by UTF-8 binary collation.
• Comparing between different types are inconsistent among database engines, thus this function will just error with InvalidArguments.

pub fn sql_add(&self, other: &Self) -> Result<Self, Error>

Adds two values using the rules common among SQL implementations.

pub fn sql_sub(&self, other: &Self) -> Result<Self, Error>

Subtracts two values using the rules common among SQL implementations.

pub fn sql_mul(&self, other: &Self) -> Result<Self, Error>

Multiplies two values using the rules common among SQL implementations.

pub fn sql_float_div(&self, other: &Self) -> Result<Self, Error>

Divides two values using the rules common among SQL implementations.

pub fn try_sql_concat(
    values: impl Iterator<Item = Result<Self, Error>>
) -> Result<Self, Error>

Concatenates multiple values into a string.

Trait Implementations

impl AsValue for Value

fn as_value(&self) -> Option<&Value>

Borrows a Value out of this instance. Returns None if this instance does not contain any Values.

fn to_compiled(&self) -> Compiled

Converts this instance into an owned compiled expression.

impl Clone for Value

fn clone(&self) -> Value

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Value

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

Formats the value using the given formatter.

impl Display for Value

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

Formats the value using the given formatter.

impl From<Bytes> for Value

fn from(b: Bytes) -> Self

Converts to this type from the input type.

impl<T: Into<Value>> From<Option<T>> for Value

fn from(value: Option<T>) -> Self

Converts to this type from the input type.

impl From<String> for Value

fn from(value: String) -> Self

Converts to this type from the input type.

impl<T: Into<Number>> From<T> for Value

fn from(value: T) -> Self

Converts to this type from the input type.

impl From<Vec<u8, Global>> for Value

fn from(bytes: Vec<u8>) -> Self

Converts to this type from the input type.

impl PartialEq<Value> for Value

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

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'s> TryFromValue<'s> for &'s Value

const NAME: &'static str = "value"

The name of the type, used when an error happens.

fn try_from_value(value: &'s Value) -> Option<Self>

Converts a Value into the required type.

impl StructuralPartialEq for Value