Struct Set

pub struct Set { /* private fields */ }

Represents a SET statement for an update expression. Most of the time you won’t use this directly.

See also: Update, Path::set, Path::if_not_exists, Path::math Path::list_append, Set::and

Examples

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

let set = Set::from("foo".parse::<Path>().unwrap().math().add(1));
assert_eq!("SET foo = foo + 1", set.to_string());

let set_foo = Set::from("foo".parse::<Path>().unwrap().math().add(1));
assert_eq!("SET foo = foo + 1", set_foo.to_string());

let set_bar = Set::from("bar".parse::<Path>().unwrap().if_not_exists().set("a value"));
assert_eq!(r#"SET bar = if_not_exists(bar, "a value")"#, set_bar.to_string());

let set = set_foo.and(set_bar);
assert_eq!(
    r#"SET foo = foo + 1, bar = if_not_exists(bar, "a value")"#,
    set.to_string(),
);

let set = Set::from("foo".parse::<Path>().unwrap().list_append().list(["a", "b", "c"]));
assert_eq!(r#"SET foo = list_append(foo, ["a", "b", "c"])"#, set.to_string());

Implementations

impl Set

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, update::Set};

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

Trait Implementations

impl Clone for Set

fn clone(&self) -> Set

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Set

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

Formats the value using the given formatter.

impl Display for Set

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

Formats the value using the given formatter.

impl From<Set> for Update

fn from(value: Set) -> Self

Converts to this type from the input type.

impl<T> From<T> for Set

where T: Into<SetAction>,

fn from(value: T) -> Self

Converts to this type from the input type.

impl<T> FromIterator<T> for Set

where T: Into<SetAction>,

fn from_iter<I>(iter: I) -> Self

where I: IntoIterator<Item = T>,

Creates a value from an iterator.

impl PartialEq for Set

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

impl StructuralPartialEq for Set