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.

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.

Trait Implementations

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<'_>, Error>

Start read-only transaction

fn clone_ro(&self) -> EnvRo

Get new read-only handle for environment

fn max_keysize(&self) -> usize

Get maximum size of keys and duplicate data

fn valid_keysize<K>(&self, key: &K) -> bool where
    K: ?Sized + Storable, 

Checks if key or duplicate data has valid size

unsafe fn open_dbs<'a, K, V, C>(
    &self,
    options: impl IntoIterator<IntoIter = impl Iterator<Item = &'a DbOptions<K, V, C, Option<CString>>> + ExactSizeIterator>
) -> Result<Vec<Db<K, V, C>>, Error> where
    K: ?Sized + Storable,
    V: ?Sized + Storable,
    C: Constraint, 

Open databases in environment

fn clear_stale_readers(&self) -> Result<(), Error>

Clear stale readers

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

Open database in environment

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, 

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: &EnvRo) -> bool

This method tests for !=.

impl PartialEq<EnvRo> for EnvRw

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

Returns true if both handles refer to the same environment

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

This method tests for !=.

impl PartialEq<EnvRw> for EnvRo

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

Returns true if both handles refer to the same environment

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

This method tests for !=.

impl Eq for EnvRo

impl StructuralEq for EnvRo

impl StructuralPartialEq for EnvRo