Struct fadroma::prelude::cosmwasm_storage::StorageTransaction

pub struct StorageTransaction<'a, S> where
    S: ReadonlyStorage,  { /* private fields */ }

Implementations

impl<'a, S> StorageTransaction<'a, S> where
    S: ReadonlyStorage, 

pub fn new(storage: &'a S) -> StorageTransaction<'a, S>

pub fn prepare(self) -> RepLog

prepares this transaction to be committed to storage

pub fn rollback(self)

rollback will consume the checkpoint and drop all changes (no really needed, going out of scope does the same, but nice for clarity)

Trait Implementations

impl<'a, S> ReadonlyStorage for StorageTransaction<'a, S> where
    S: ReadonlyStorage, 

fn range(
    &'b self,
    start: Option<&[u8]>,
    end: Option<&[u8]>,
    order: Order
) -> Box<dyn Iterator<Item = (Vec<u8, Global>, Vec<u8, Global>)> + 'b, Global>

range allows iteration over a set of keys, either forwards or backwards uses standard rust range notation, and eg db.range(b“foo“..b“bar“) also works reverse

fn get(&self, key: &[u8]) -> Option<Vec<u8, Global>>

Returns None when key does not exist. Returns Some(Vec) when key exists.

impl<'a, S> Storage for StorageTransaction<'a, S> where
    S: ReadonlyStorage, 

fn set(&mut self, key: &[u8], value: &[u8])

fn remove(&mut self, key: &[u8])

Removes a database entry at key.