Struct ckb_rocksdb::Snapshot

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

A consistent view of the database at the point of creation.

use ckb_rocksdb::{prelude::*, IteratorMode};

let path = "_path_for_rocksdb_storage3";

    let db = DB::open_default(&path).unwrap();
    let snapshot = db.snapshot(); // Creates a longer-term snapshot of the DB, but closed when goes out of scope
    let mut iter = snapshot.iterator(IteratorMode::Start); // Make as many iterators as you'd like from one snapshot

Trait Implementations

impl<'a> ConstHandle<rocksdb_snapshot_t> for Snapshot<'a>

fn const_handle(&self) -> *const rocksdb_snapshot_t

impl<'a> Drop for Snapshot<'a>

fn drop(&mut self)

Executes the destructor for this type.

impl<'a> GetCF<ReadOptions> for Snapshot<'a>

fn get_cf_full<K: AsRef<[u8]>>(
    &self,
    cf: Option<&ColumnFamily>,
    key: K,
    readopts: Option<&ReadOptions>
) -> Result<Option<DBVector>, Error>

fn get_cf<K: AsRef<[u8]>>(
    &self,
    cf: &ColumnFamily,
    key: K
) -> Result<Option<DBVector>, Error>

fn get_cf_opt<K: AsRef<[u8]>>(
    &self,
    cf: &ColumnFamily,
    key: K,
    readopts: &R
) -> Result<Option<DBVector>, Error>

impl<'a> Iterate for Snapshot<'a>

fn get_raw_iter(&self, readopts: &ReadOptions) -> DBRawIterator

Important traits for DBIterator<'a>

impl<'a> Iterator for DBIterator<'a> type Item = (Box<[u8]>, Box<[u8]>);

fn get_iter(&self, readopts: &ReadOptions, mode: IteratorMode) -> DBIterator

Important traits for DBIterator<'a>

impl<'a> Iterator for DBIterator<'a> type Item = (Box<[u8]>, Box<[u8]>);

fn iterator_opt(&self, mode: IteratorMode, readopts: &ReadOptions) -> DBIterator

Important traits for DBIterator<'a>

impl<'a> Iterator for DBIterator<'a> type Item = (Box<[u8]>, Box<[u8]>);

fn iterator(&self, mode: IteratorMode) -> DBIterator

Important traits for DBIterator<'a>

impl<'a> Iterator for DBIterator<'a> type Item = (Box<[u8]>, Box<[u8]>);

fn full_iterator(&self, mode: IteratorMode) -> DBIterator

Opens an interator with set_total_order_seek enabled. This must be used to iterate across prefixes when set_memtable_factory has been called with a Hash-based implementation.

Important traits for DBIterator<'a>

impl<'a> Iterator for DBIterator<'a> type Item = (Box<[u8]>, Box<[u8]>);

fn prefix_iterator(&self, prefix: &[u8]) -> DBIterator

fn raw_iterator(&self) -> DBRawIterator

impl<'a> IterateCF for Snapshot<'a>

fn get_raw_iter_cf(
    &self,
    cf_handle: &ColumnFamily,
    readopts: &ReadOptions
) -> Result<DBRawIterator, Error>

fn get_iter_cf(
    &self,
    cf_handle: &ColumnFamily,
    readopts: &ReadOptions,
    mode: IteratorMode
) -> Result<DBIterator, Error>

fn iterator_cf_opt(
    &self,
    cf_handle: &ColumnFamily,
    mode: IteratorMode,
    readopts: &ReadOptions
) -> Result<DBIterator, Error>

Opens an interator using the provided ReadOptions. This is used when you want to iterate over a specific ColumnFamily with a modified ReadOptions

fn iterator_cf(
    &self,
    cf_handle: &ColumnFamily,
    mode: IteratorMode
) -> Result<DBIterator, Error>

fn full_iterator_cf(
    &self,
    cf_handle: &ColumnFamily,
    mode: IteratorMode
) -> Result<DBIterator, Error>

fn prefix_iterator_cf(
    &self,
    cf_handle: &ColumnFamily,
    prefix: &[u8]
) -> Result<DBIterator, Error>

fn raw_iterator_cf(
    &self,
    cf_handle: &ColumnFamily
) -> Result<DBRawIterator, Error>

impl<'a> Read for Snapshot<'a>