Struct MdbxCursor 

pub struct MdbxCursor<'txn, K: TransactionKind, T: Table> { /* private fields */ }

A cursor for navigating the entries within a table. Wraps the libmdbx cursor so that we only expose our own methods.

Trait Implementations

impl<Kind: TransactionKind, T: Table> Clone for MdbxCursor<'_, Kind, T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'txn, Kind: TransactionKind, T: DupTable> DupReadCursor<'txn, T> for MdbxCursor<'txn, Kind, T>

fn first_duplicate(&mut self) -> Option<T::Value>

Positions the cursor at the first duplicate value for the current key.

fn last_duplicate(&mut self) -> Option<T::Value>

Positions the cursor at the last duplicate value for the current key.

fn next_duplicate(&mut self) -> Option<Row<T>>

Positions the cursor at the next duplicate value for the current key. This does not jump keys.

fn next_no_duplicate(&mut self) -> Option<Row<T>>

Positions the cursor at the first duplicate of the next key.

fn prev_duplicate(&mut self) -> Option<Row<T>>

Positions the cursor at the previous duplicate value for the current key.

fn prev_no_duplicate(&mut self) -> Option<Row<T>>

Positions the cursor at the last duplicate of the previous key.

fn set_subkey( &mut self, key: &T::Key, subkey: &DupSubKey<T>, ) -> Option<T::Value>

where T::Value: DupTableValue,

Positions the cursor at the entry with a given key and subkey.

fn set_lowerbound_both( &mut self, key: &T::Key, subkey: &DupSubKey<T>, ) -> Option<Row<T>>

where T::Value: DupTableValue,

Positions the cursor at the first duplicate entry that has a key >= key && subkey >= subkey.

fn set_lowerbound_subkey( &mut self, key: &T::Key, subkey: &DupSubKey<T>, ) -> Option<T::Value>

where T::Value: DupTableValue,

Positions the cursor at the first duplicate entry that has a key == key && subkey >= subkey.

fn count_duplicates(&mut self) -> usize

Counts the number of duplicates (linear operation!).

fn into_iter_dup_of(self, key: &T::Key) -> Self::IntoIter

Iterates over all duplicates of the given key.

impl<'txn, Kind: TransactionKind, T: Table> ReadCursor<'txn, T> for MdbxCursor<'txn, Kind, T>

type IntoIter = IntoIter<'txn, Kind, T>

fn first(&mut self) -> Option<Row<T>>

Positions the cursor at the first entry in the table.

fn last(&mut self) -> Option<Row<T>>

Positions the cursor at the last entry in the table.

fn next(&mut self) -> Option<Row<T>>

Positions the cursor at the next entry in the table. For a DupTable, this can be either the next duplicate for the current key or the first duplicate for the next key.

fn prev(&mut self) -> Option<Row<T>>

Positions the cursor at the previous entry in the table. For a DupTable, this can be either the next duplicate for the current key or the first duplicate for the next key.

fn get_current(&mut self) -> Option<Row<T>>

Returns the current entry at the cursor position.

fn set_key(&mut self, key: &T::Key) -> Option<T::Value>

Positions the cursor at the entry that has a key == key. Previously seek_key.

fn set_lowerbound_key(&mut self, key: &T::Key) -> Option<Row<T>>

Positions the cursor at the first entry that has a key >= key. Previously seek_range_key.

fn into_iter_start(self) -> Self::IntoIter

Iterates over all entries in the table.

fn into_iter_from(self, key: &T::Key) -> Self::IntoIter

Iterates over all entries in the table starting from a given key.