Struct nimiq_database::WriteTransaction

pub struct WriteTransaction<'env>(_);

Methods

impl<'env> WriteTransaction<'env>

pub fn new(env: &'env Environment) -> Self

pub fn get<K: ?Sized, V>(&self, db: &Database, key: &K) -> Option<V> where
    K: AsDatabaseBytes,
    V: FromDatabaseValue, 

pub fn put_reserve<K: ?Sized, V: ?Sized>(
    &mut self,
    db: &Database,
    key: &K,
    value: &V
) where
    K: AsDatabaseBytes,
    V: IntoDatabaseValue, 

Puts a key/value pair into the database by copying it into a reserved space in the database. This works best for values that need to be serialised into the reserved space. This method will panic when called on a database with duplicate keys!

pub fn put<K: ?Sized, V: ?Sized>(&mut self, db: &Database, key: &K, value: &V) where
    K: AsDatabaseBytes,
    V: AsDatabaseBytes, 

Puts a key/value pair into the database by passing a reference to a byte slice. This is more efficient than put_reserve if no serialisation is needed, and the existing value can be immediately written into the database. This also works with duplicate key databases.

pub fn remove<K: ?Sized>(&mut self, db: &Database, key: &K) where
    K: AsDatabaseBytes, 

pub fn remove_item<K: ?Sized, V: ?Sized>(
    &mut self,
    db: &Database,
    key: &K,
    value: &V
) where
    K: AsDatabaseBytes,
    V: AsDatabaseBytes, 

pub fn commit(self)

pub fn abort(self)

pub fn cursor<'txn, 'db>(
    &'txn self,
    db: &'db Database<'env>
) -> Cursor<'txn, 'db>

Methods from Deref<Target = Transaction<'env>>

pub fn get<K: ?Sized, V>(&self, db: &Database, key: &K) -> Option<V> where
    K: AsDatabaseBytes,
    V: FromDatabaseValue, 

pub fn cursor<'txn, 'db>(
    &'txn self,
    db: &'db Database<'env>
) -> Cursor<'txn, 'db>

Trait Implementations

impl<'env> Debug for WriteTransaction<'env>

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

Formats the value using the given formatter.

impl<'env> Deref for WriteTransaction<'env>

type Target = Transaction<'env>

The resulting type after dereferencing.

fn deref(&self) -> &Transaction<'env>

Dereferences the value.