Struct Batch 

pub struct Batch { /* private fields */ }

A batch of updates that will be applied atomically to the Tree.

Examples

use melange_db::{Batch, open};

let db: melange_db::Db<1024> = open("batch_db_2")?;
db.insert("key_0", "val_0")?;

let mut batch = Batch::default();
batch.insert("key_a", "val_a");
batch.insert("key_b", "val_b");
batch.insert("key_c", "val_c");
batch.remove("key_0");

db.apply_batch(batch)?;
// key_0 no longer exists, and key_a, key_b, and key_c
// now do exist.

Implementations

impl Batch

pub fn insert<K, V>(&mut self, key: K, value: V)

where K: Into<InlineArray>, V: Into<InlineArray>,

Set a key to a new value

pub fn remove<K>(&mut self, key: K)

where K: Into<InlineArray>,

Remove a key

pub fn get<K: AsRef<[u8]>>(&self, k: K) -> Option<Option<&InlineArray>>

Get a value if it is present in the Batch. Some(None) means it’s present as a deletion.

Trait Implementations

impl Clone for Batch

fn clone(&self) -> Batch

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Batch

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

Formats the value using the given formatter.

impl Default for Batch

fn default() -> Batch

Returns the “default value” for a type.

impl PartialEq for Batch

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

impl StructuralPartialEq for Batch