Struct mmtkvdb::EnvRw

pub struct EnvRw { /* private fields */ }

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

An environment can be opened using EnvBuilder.

Use Env::open_db or EnvRw::create_db to retrieve database handles and EnvRw::txn_rw to start a read-write transaction.

It’s possible to create a read-only handle by invoking Env::clone_ro. The environment is closed when the last handle is dropped.

Implementations

impl EnvRw

pub unsafe fn create_dbs<'a, K, V, C>(
    &mut 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 and create if non-existing

SAFETY: If a database exists already, it must have been created with compatible options.

pub unsafe fn create_db<K, V, C>(
    &mut 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 and create if non-existing

SAFETY: If a database exists already, it must have been created with compatible options.

pub fn drop_db<K, V, C>(&self, db: Db<K, V, C>) -> Result<(), Error> where
    K: ?Sized + Storable,
    V: ?Sized + Storable,
    C: Constraint, 

Delete database in environment

pub fn txn_rw(&mut self) -> Result<TxnRw<'_>, Error>

Start read-write transaction

Trait Implementations

impl Debug for EnvRw

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

Formats the value using the given formatter.

impl Env for EnvRw

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 EnvRw

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 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 EnvRw

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

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

fn ne(&self, other: &EnvRw) -> 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 EnvRw

impl StructuralEq for EnvRw

impl StructuralPartialEq for EnvRw