Struct grin_store::lmdb::Batch

pub struct Batch<'a> { /* fields omitted */ }

Batch to write multiple Writeables to db in an atomic manner.

Implementations

impl<'a> Batch<'a>

pub fn put(&self, key: &[u8], value: &[u8]) -> Result<(), Error>

Writes a single key/value pair to the db

pub fn put_ser<W: Writeable>(&self, key: &[u8], value: &W) -> Result<(), Error>

Writes a single key and its Writeable value to the db. Encapsulates serialization using the (default) version configured on the store instance.

pub fn protocol_version(&self) -> ProtocolVersion

Protocol version used by this batch.

pub fn put_ser_with_version<W: Writeable>(
    &self,
    key: &[u8],
    value: &W,
    version: ProtocolVersion
) -> Result<(), Error>

Writes a single key and its Writeable value to the db. Encapsulates serialization using the specified protocol version.

pub fn get_with<T, F>(&self, key: &[u8], f: F) -> Result<Option<T>, Error> where
    F: Fn(&[u8]) -> T, 

gets a value from the db, provided its key

pub fn exists(&self, key: &[u8]) -> Result<bool, Error>

Whether the provided key exists

pub fn iter<T: Readable>(&self, from: &[u8]) -> Result<SerIterator<T>, Error>

Produces an iterator of Readable types moving forward from the provided key.

pub fn get_ser<T: Readable>(&self, key: &[u8]) -> Result<Option<T>, Error>

Gets a Readable value from the db, provided its key, taking the content of the current batch into account.

pub fn delete(&self, key: &[u8]) -> Result<(), Error>

Deletes a key/value pair from the db

pub fn commit(self) -> Result<(), Error>

Writes the batch to db

pub fn child(&mut self) -> Result<Batch<'_>, Error>

Creates a child of this batch. It will be merged with its parent on commit, abandoned otherwise.