Struct Batch 

pub struct Batch<'a, K, V, D>
where
    K: Array,
    V: Codec + Clone,
    D: Getter<K, V>,
{ /* private fields */ }

A batch of changes which may be written to an underlying database with Batchable::write_batch. Writes and deletes to a batch are not applied to the database until the batch is written but will be reflected in reads from the batch.

Implementations

impl<'a, K, V, D> Batch<'a, K, V, D>

where K: Array, V: Codec + Clone, D: Getter<K, V>,

pub const fn new(db: &'a D) -> Self

Returns a new batch of changes that may be written to the database.

pub async fn get(&self, key: &K) -> Result<Option<V>, Error>

Returns the value of key in the batch, or the value in the database if it is not present in the batch.

pub async fn create(&mut self, key: K, value: V) -> Result<bool, Error>

Creates a new key-value pair in the batch if it isn’t present in the batch or database. Returns true if the key was created, false if it already existed.

pub async fn update(&mut self, key: K, value: V) -> Result<(), Error>

Updates the value of key to value in the batch.

pub async fn delete(&mut self, key: K) -> Result<bool, Error>

Deletes key from the batch. Returns true if the key was in the batch or database, false otherwise.

pub async fn delete_unchecked(&mut self, key: K) -> Result<(), Error>

Deletes key from the batch without checking if it is present in the batch or database.

Trait Implementations

impl<'a, K, V, D> IntoIterator for Batch<'a, K, V, D>

where K: Array, V: Codec + Clone, D: Getter<K, V>,

type Item = (K, Option<V>)

The type of the elements being iterated over.

type IntoIter = IntoIter<K, Option<V>>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.