Enum dynamodb_expression::update::Update

pub enum Update {
    Set(Set),
    Remove(Remove),
    Add(Add),
    Delete(Delete),
}

Represents a DynamoDB update expression.

Examples

use dynamodb_expression::{
    update::{Remove, Update},
    Path,
};

let update = Update::from(Path::new_name("foo").math().add(7));
assert_eq!("SET foo = foo + 7", update.to_string());

let update = Update::from(Path::new_name("foo").if_not_exists().assign("a value"));
assert_eq!(
    r#"SET foo = if_not_exists(foo, "a value")"#,
    update.to_string()
);

let update = Update::from(Remove::new_name("foo"));
assert_eq!(r#"REMOVE foo"#, update.to_string());

let update = Update::from("foo[3].bar[0]".parse::<Path>().unwrap().remove());
assert_eq!(r#"REMOVE foo[3].bar[0]"#, update.to_string());

let update = Update::from(Remove::from_iter(
    ["foo", "bar", "baz"].into_iter().map(Path::new_name),
));
assert_eq!(r#"REMOVE foo, bar, baz"#, update.to_string());

Variants

Set(Set)

Remove(Remove)

Add(Add)

Delete(Delete)

Implementations

impl Update

pub fn new_set<T>(set: T) -> Selfwhere T: Into<Set>,

A new update expression for a Set statement.

pub fn new_remove<T>(remove: T) -> Selfwhere T: Into<Remove>,

A new update expression for a Remove statement.

pub fn new_add<T>(add: T) -> Selfwhere T: Into<Add>,

A new update expression for an Add statement.

pub fn new_delete<T>(delete: T) -> Selfwhere T: Into<Delete>,

A new update expression for a Delete statement.

Trait Implementations

impl Clone for Update

fn clone(&self) -> Update

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Update

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

Formats the value using the given formatter.

impl Display for Update

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

Formats the value using the given formatter.

impl From<Add> for Update

fn from(value: Add) -> Self

Converts to this type from the input type.

impl From<Assign> for Update

fn from(value: Assign) -> Self

Converts to this type from the input type.

impl From<Delete> for Update

fn from(value: Delete) -> 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 From<ListAppend> for Update

fn from(value: ListAppend) -> 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 From<Remove> for Update

fn from(value: Remove) -> Self

Converts to this type from the input type.

impl From<Set> for Update

fn from(value: Set) -> Self

Converts to this type from the input type.

impl From<SetAction> for Update

fn from(value: SetAction) -> Self

Converts to this type from the input type.

impl PartialEq for Update

fn eq(&self, other: &Update) -> 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 Eq for Update

impl StructuralEq for Update

impl StructuralPartialEq for Update