Struct mmtkvdb::EnvRo

pub struct EnvRo { /* private fields */ }

Read-only handle for accessing environment that stores key-value databases

An environment can be opened using EnvBuilder.

The methods for read-only access are accessible through the Env trait (which is implemented by EnvRo and EnvRw).

Use Env::open_db to retrieve database handles and Env::txn_ro to start a read-only transaction.

It’s possible to clone the handle, in which case the environment will be closed when the last handle is dropped. It’s also possible to create a read-only handle from a read-write handle (EnvRw) by invoking Env::clone_ro.

Trait Implementations

impl AsRef<EnvRo> for EnvRo

fn as_ref(&self) -> &EnvRo

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<EnvRo> for EnvRw

fn as_ref(&self) -> &EnvRo

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for EnvRo

fn clone(&self) -> EnvRo

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for EnvRo

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Env for EnvRo

fn txn_ro(&self) -> Result<TxnRo<'_>>

Start read-only transaction

fn max_keysize(&self) -> usize

Get maximum size of keys and duplicate data

fn valid_keysize<'kr, K, KRef>(&self, key: KRef) -> boolwhere K: ?Sized + Storable + 'kr, KRef: StorableRef<'kr, K>,

Checks if key or duplicate data has valid size

unsafe fn open_db<K, V, C>( &self, options: &DbSpec<K, V, C> ) -> Result<Db<K, V, C>>where K: ?Sized + Storable, V: ?Sized + Storable, C: Constraint,

Open database in environment

fn clear_stale_readers(&self) -> Result<usize>

Clear stale readers

fn as_env_ro(&self) -> &EnvRo

Reference conversion to EnvRo

fn clone_ro(&self) -> EnvRo

Clone as EnvRo

impl Hash for EnvRo

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq<EnvRo> for EnvRo

fn eq(&self, other: &EnvRo) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for EnvRo

impl StructuralEq for EnvRo

impl StructuralPartialEq for EnvRo