Struct transact::database::btree::BTreeWriter

pub struct BTreeWriter<'a> { /* fields omitted */ }

Methods

impl<'a> BTreeWriter<'a>

pub fn new(db: RwLockWriteGuard<'a, BTreeDbInternal>) -> BTreeWriter

Trait Implementations

impl<'a> DatabaseReader for BTreeWriter<'a>

fn get(&self, key: &[u8]) -> Option<Vec<u8>>

Returns the bytes stored at the given key, if found.

fn index_get(
    &self,
    index: &str,
    key: &[u8]
) -> Result<Option<Vec<u8>>, DatabaseError>

Returns the bytes stored at the given key on a specified index, if found.

fn cursor(&self) -> Result<DatabaseCursor, DatabaseError>

Returns a cursor against the main database. The cursor iterates over the entries in the natural key order.

fn index_cursor(&self, index: &str) -> Result<DatabaseCursor, DatabaseError>

Returns a cursor against the given index. The cursor iterates over the entries in the index's natural key order.

fn count(&self) -> Result<usize, DatabaseError>

Returns the number of entries in the main database.

fn index_count(&self, index: &str) -> Result<usize, DatabaseError>

Returns the number of entries in the given index

impl<'a> DatabaseWriter for BTreeWriter<'a>

fn put(&mut self, key: &[u8], value: &[u8]) -> Result<(), DatabaseError>

Writes the given key/value pair. If the key/value pair already exists, it will return a DatabaseError::DuplicateEntry.

fn overwrite(&mut self, key: &[u8], value: &[u8]) -> Result<(), DatabaseError>

Writes the given key/value pair. If the key/value pair already exists, it overwrites the old value

fn index_put(
    &mut self,
    index: &str,
    key: &[u8],
    value: &[u8]
) -> Result<(), DatabaseError>

Writes the given key/value pair at index.

fn delete(&mut self, key: &[u8]) -> Result<(), DatabaseError>

Deletes the given key/value pair. If the key does exist, it returns an error,

fn index_delete(&mut self, index: &str, key: &[u8]) -> Result<(), DatabaseError>

Deletes the given key/value pair at index.

fn commit(self: Box<Self>) -> Result<(), DatabaseError>

fn as_reader(&self) -> &dyn DatabaseReader