Struct IfNotExists

pub struct IfNotExists { /* private fields */ }

Represents an update expression to set an attribute if it doesn’t exist.

Prefer Path::if_not_exists over this.

Implementations

impl IfNotExists

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

where T: Into<Path>,

Prefer Path::if_not_exists over this.

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

where T: Into<Update>,

Add an additional Update statement to this expression.

use dynamodb_expression::{Num, Path, update::Set};

let set = "foo"
    .parse::<Path>()?
    .if_not_exists()
    .set(Num::new(7))
    .and("bar".parse::<Path>()?.set("a value"));
assert_eq!(r#"SET foo = if_not_exists(foo, 7), bar = "a value""#, set.to_string());

Trait Implementations

impl Clone for IfNotExists

fn clone(&self) -> IfNotExists

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for IfNotExists

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

Formats the value using the given formatter.

impl Display for IfNotExists

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

Formats the value using the given formatter.

impl From<IfNotExists> for SetAction

fn from(if_not_exists: IfNotExists) -> Self

Converts to this type from the input type.

impl From<IfNotExists> for Update

fn from(value: IfNotExists) -> Self

Converts to this type from the input type.

impl PartialEq for IfNotExists

fn eq(&self, other: &IfNotExists) -> 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 IfNotExists

impl StructuralPartialEq for IfNotExists