Enum dynamodb_expression::value::Scalar

pub enum Scalar {
    String(String),
    Num(Num),
    Bool(bool),
    Binary(Vec<u8>),
    Null,
}

https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.NamingRulesDataTypes.html#HowItWorks.DataTypes

Variants

String(String)

DynamoDB string value

Num(Num)

DynamoDB numeric value

Bool(bool)

DynamoDB boolean value

Binary(Vec<u8>)

DynamoDB binary value

Null

DynamoDB null value

Implementations

impl Scalar

pub fn new_string<T>(value: T) -> Selfwhere T: Into<String>,

Use when you need a string value for DynamoDB.

See also: Value::new_string

pub fn new_num<N>(value: N) -> Selfwhere N: ToString + Num,

Use when you need a numeric value for DynamoDB.

See also: Scalar::new_num_lower_exp, Scalar::new_num_upper_exp, Value::new_num, Num

Examples

use dynamodb_expression::Scalar;

let value = Scalar::new_num(2600);
assert_eq!("2600", value.to_string());

let value = Scalar::new_num(2600.0);
assert_eq!("2600", value.to_string());

pub fn new_num_lower_exp<N>(value: N) -> Selfwhere N: LowerExp + Num,

Use when you need a numeric value for DynamoDB in exponent form (with a lowercase e).

See also: Scalar::new_num, Scalar::new_num_upper_exp, Value::new_num_lower_exp, Num

Examples

use dynamodb_expression::Scalar;

let value = Scalar::new_num_lower_exp(2600);
assert_eq!("2.6e3", value.to_string());

let value = Scalar::new_num_lower_exp(2600.0);
assert_eq!("2.6e3", value.to_string());

pub fn new_num_upper_exp<N>(value: N) -> Selfwhere N: UpperExp + Num,

Use when you need a numeric value for DynamoDB in exponent form (with an uppercase e).

See also: Scalar::new_num, Scalar::new_num_lower_exp, Value::new_num_upper_exp, Num

Examples

use dynamodb_expression::Scalar;

let value = Scalar::new_num_upper_exp(2600);
assert_eq!("2.6E3", value.to_string());

let value = Scalar::new_num_upper_exp(2600.0);
assert_eq!("2.6E3", value.to_string());

pub fn new_bool(b: bool) -> Self

Use when you need a boolean value for DynamoDB.

See also: Value::new_bool

pub fn new_binary<B>(binary: B) -> Selfwhere B: Into<Vec<u8>>,

Use when you need a binary value for DynamoDB.

See also: Value::new_binary

pub fn new_null() -> Self

Use when you need a null value for DynamoDB.

See also: Value::new_null

Trait Implementations

impl Clone for Scalar

fn clone(&self) -> Scalar

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Scalar

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

Formats the value using the given formatter.

impl Display for Scalar

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

Formats the value using the given formatter.

impl From<&&str> for Scalar

fn from(value: &&str) -> Self

Converts to this type from the input type.

impl From<&String> for Scalar

fn from(value: &String) -> Self

Converts to this type from the input type.

impl From<&str> for Scalar

fn from(value: &str) -> Self

Converts to this type from the input type.

impl<const N: usize> From<[u8; N]> for Scalar

fn from(value: [u8; N]) -> Self

Converts to this type from the input type.

impl From<()> for Scalar

fn from(_: ()) -> Self

Converts to this type from the input type.

impl From<Num> for Scalar

fn from(value: Num) -> Self

Converts to this type from the input type.

impl From<Scalar> for Value

fn from(value: Scalar) -> Self

Converts to this type from the input type.

impl From<String> for Scalar

fn from(value: String) -> Self

Converts to this type from the input type.

impl From<Vec<u8>> for Scalar

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

Converts to this type from the input type.

impl From<bool> for Scalar

fn from(value: bool) -> Self

Converts to this type from the input type.

impl FromIterator<u8> for Scalar

fn from_iter<T>(iter: T) -> Selfwhere T: IntoIterator<Item = u8>,

Creates a value from an iterator.

impl Hash for Scalar

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Scalar

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

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for Scalar

fn eq(&self, other: &Scalar) -> 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 PartialOrd for Scalar

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

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for Scalar

impl StructuralEq for Scalar

impl StructuralPartialEq for Scalar