Struct Update

pub struct Update { /* private fields */ }

Represents a DynamoDB update expression.

See also: Expression, Set, Remove, Add, Delete

Examples

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

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

let update = Update::from("foo".parse::<Path>()?.if_not_exists().set("a value"));
assert_eq!(
    r#"SET foo = if_not_exists(foo, "a value")"#,
    update.to_string()
);

let update = Update::from("foo".parse::<Path>()?.remove());
assert_eq!(r#"REMOVE foo"#, update.to_string());

// To use an `Update`, build an `Expression`.
let expression = Expression::builder().with_update(update).build();

Implementations

impl Update

pub fn new_set<T>(set: T) -> Self

where T: Into<Set>,

A new update expression for a Set statement.

pub fn new_remove<T>(remove: T) -> Self

where T: Into<Remove>,

A new update expression for a Remove statement.

pub fn new_add<T>(add: T) -> Self

where T: Into<Add>,

A new update expression for an Add statement.

pub fn new_delete<T>(delete: T) -> Self

where T: Into<Delete>,

A new update expression for a Delete statement.

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

where T: Into<Update>,

Combine this Update statement with another.

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<AddAction> for Update

fn from(value: AddAction) -> 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<DeleteAction> for Update

fn from(value: DeleteAction) -> 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

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 Update

impl StructuralPartialEq for Update