Struct sanakirja::Txn

pub struct Txn<E: Borrow<Env>> { /* private fields */ }

An immutable transaction.

Implementations

impl<E: Borrow<Env>> Txn<E>

pub fn env_borrow(&self) -> &Env

Borrow env

impl<E: Borrow<Env>> Txn<E>

pub fn root(&self, n: usize) -> u64

A “raw” version of the root_db method, useful to store things other than databases.

Trait Implementations

impl<E: Borrow<Env>> Drop for Txn<E>

fn drop(&mut self)

Executes the destructor for this type.

impl<E: Borrow<Env>> LoadPage for Txn<E>

unsafe fn load_page(&self, off: u64) -> Result<CowPage, Self::Error>

Find the appropriate map segment

type Error = Error

fn rc(&self, _: u64) -> Result<u64, Self::Error>

Reference-counting. Since reference-counts are designed to be storable into B trees by external allocators, pages referenced once aren’t stored, and hence are indistinguishable from pages that are never referenced. The default implementation returns 0.

unsafe fn load_page_contiguous( &self, _off: u64, _len: u64 ) -> Result<CowPage, Self::Error>

Loading multiple pages written contiguously in the underlying storage media.

impl<E: Borrow<Env>> RootDb for Txn<E>

fn root_db<K: Storable + ?Sized, V: Storable + ?Sized, P: BTreePage<K, V>>( &self, n: usize ) -> Option<Db_<K, V, P>>

This is a straightforward implementation of just accessing index n.

impl<E: Borrow<Env>> RootPage for Txn<E>

unsafe fn root_page(&self) -> &[u8; 4064]

The root page of this transaction.