Struct Math

pub struct Math { /* private fields */ }

Represents a DynamoDB math operation used as a part of an update expression.

Prefer Path::math over this.

Implementations

impl Math

A math operation to modify a field and assign the updated value to another (possibly different) field.

Prefer Path::math over this.

pub fn builder<T>(dst: T) -> Builder

where T: Into<Path>,

Prefer Path::math over this.

pub fn and<T>(self, other: T) -> Update

where T: Into<Update>,

Add an additional Update statement to this expression.

use dynamodb_expression::{Num, Path};

let set = "foo"
    .parse::<Path>()?
    .math()
    .add(1)
    .and("bar".parse::<Path>()?.set("a value"));
assert_eq!(r#"SET foo = foo + 1, bar = "a value""#, set.to_string());

Trait Implementations

impl Clone for Math

fn clone(&self) -> Math

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Math

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

Formats the value using the given formatter.

impl Display for Math

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

Formats the value using the given formatter.

impl From<Math> for SetAction

fn from(math: Math) -> Self

Converts to this type from the input type.

impl From<Math> for Update

fn from(value: Math) -> Self

Converts to this type from the input type.

impl PartialEq for Math

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Math

impl StructuralPartialEq for Math