Struct Snapshot

pub struct Snapshot<'a> { /* private fields */ }

A database snapshot

Represents a database at a certain point in time, and allows for all read operations (get and iteration).

Implementations

impl<'a> Snapshot<'a>

pub fn get( &self, options: &ReadOptions, key: &dyn IntoLevelDBKey, ) -> Result<Option<Vec<u8>>, Error>

fetches a key from the database

Inserts this snapshot into ReadOptions before reading

pub fn get_u8( &self, options: &ReadOptions, key: &[u8], ) -> Result<Option<Vec<u8>>, Error>

override the get_u8 of Database. Overriding is for avoiding the snapshot field of ReadOption, if so, a lifetime parameter must be added for ReadOption.

pub fn raw_ptr(&self) -> *mut leveldb_snapshot_t

Trait Implementations

impl<'a> Iterable<'a> for Snapshot<'a>

fn iter(&'a self, options: &ReadOptions) -> Iterator<'a>

Return an Iterator iterating over (Key,Value) pairs

fn keys_iter(&'a self, options: &ReadOptions) -> KeyIterator<'a>

Returns an Iterator iterating over Keys only.

fn value_iter(&'a self, options: &ReadOptions) -> ValueIterator<'a>

Returns an Iterator iterating over Values only.