Struct ord_lmdb_rs::core::Cursor

pub struct Cursor<'txn> { /* private fields */ }

Implementations

impl<'txn> Cursor<'txn>

pub fn to_first(&mut self) -> MdbResult<()>

Moves cursor to first entry

pub fn to_last(&mut self) -> MdbResult<()>

Moves cursor to last entry

pub fn to_key<'k, K: ToMdbValue>(&mut self, key: &'k K) -> MdbResult<()>

Moves cursor to first entry for key if it exists

pub fn to_gte_key<'k, K: ToMdbValue>(&mut self, key: &'k K) -> MdbResult<()>

Moves cursor to first entry for key greater than or equal to ke

pub fn to_item<K, V>(&mut self, key: &K, value: &V) -> MdbResult<()> where
    K: ToMdbValue,
    V: ToMdbValue, 

Moves cursor to specific item (for example, if cursor already points to a correct key and you need to delete a specific item through cursor)

pub fn to_gte_item<K, V>(&mut self, key: &K, value: &V) -> MdbResult<()> where
    K: ToMdbValue,
    V: ToMdbValue, 

Moves cursor to nearest item.

pub fn to_next_key(&mut self) -> MdbResult<()>

Moves cursor to next key, i.e. skip items with duplicate keys

pub fn to_next_item(&mut self) -> MdbResult<()>

Moves cursor to next item with the same key as current

pub fn to_prev_key(&mut self) -> MdbResult<()>

Moves cursor to prev entry, i.e. skips items with duplicate keys

pub fn to_prev_item(&mut self) -> MdbResult<()>

Moves cursor to prev item with the same key as current

pub fn to_first_item(&mut self) -> MdbResult<()>

Moves cursor to first item with the same key as current

pub fn to_last_item(&mut self) -> MdbResult<()>

Moves cursor to last item with the same key as current

pub fn get<'a, T: FromMdbValue + 'a, U: FromMdbValue + 'a>(
    &'a mut self
) -> MdbResult<(T, U)>

Retrieves current key/value as tuple

pub fn get_value<'a, V: FromMdbValue + 'a>(&'a mut self) -> MdbResult<V>

Retrieves current value

pub fn get_key<'a, K: FromMdbValue + 'a>(&'a mut self) -> MdbResult<K>

Retrieves current key

pub fn set<K: ToMdbValue, V: ToMdbValue>(
    &mut self,
    key: &K,
    value: &V,
    flags: c_uint
) -> MdbResult<()>

pub fn replace<V: ToMdbValue>(&mut self, value: &V) -> MdbResult<()>

Overwrites value for current item Note: overwrites max cur_value.len() bytes

pub fn add_item<V: ToMdbValue>(&mut self, value: &V) -> MdbResult<()>

Adds a new item when created with allowed duplicates

pub fn del(&mut self) -> MdbResult<()>

Deletes current key

pub fn del_item(&mut self) -> MdbResult<()>

Deletes only current item

Note that it doesn’t check anything so it is caller responsibility to make sure that correct item is deleted if, for example, caller wants to delete only items of current key

pub fn del_all(&mut self) -> MdbResult<()>

Deletes all items with same key as current

pub fn item_count(&self) -> MdbResult<size_t>

Returns count of items with the same key as current

pub fn get_item<'k, K: ToMdbValue>(
    self,
    k: &'k K
) -> CursorItemAccessor<'txn, 'k, K>

Trait Implementations

impl<'txn> Debug for Cursor<'txn>

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

Formats the value using the given formatter.

impl<'txn> Drop for Cursor<'txn>

fn drop(&mut self)

Executes the destructor for this type.