Struct DB

pub struct DB { /* private fields */ }

This struct represents an open instance of the database.

Implementations

impl DB

pub fn open(path: &Path) -> LevelDBResult<DB>

Open a database at the given path. Returns a Result indicating whether the database could be opened. Note that this function will not create the database at the given location if it does not exist.

pub fn create(path: &Path) -> LevelDBResult<DB>

Create and returns a database at the given path.

pub fn open_with_opts(path: &Path, opts: DBOptions) -> LevelDBResult<DB>

Open a database at the given path, using the provided options to control the open behaviour. Returns a Result indicating whether or not the database could be opened.

pub fn put(&mut self, key: &[u8], val: &[u8]) -> LevelDBResult<()>

Set the database entry for “key” to “value”. Returns a result indicating the success or failure of the operation.

pub fn put_opts( &mut self, key: &[u8], val: &[u8], opts: DBWriteOptions, ) -> LevelDBResult<()>

Set the database entry for “key” to “value”. Allows specifying the write options to use for this operaton.

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

Remove the database entry (if any) for “key”. Returns a result indicating the success of the operation. It is not an error if “key” did not exist in the database.

pub fn delete_opts( &mut self, key: &[u8], opts: DBWriteOptions, ) -> LevelDBResult<()>

Remove the database entry (if any) for “key”. As delete(), but allows specifying the write options to use for this operation.

pub fn write(&mut self, batch: DBWriteBatch) -> LevelDBResult<()>

Apply the specified updates to the database, as given in the provided DBWriteBatch. Returns a result indicating the success of the operation.

pub fn write_opts( &mut self, batch: DBWriteBatch, opts: DBWriteOptions, ) -> LevelDBResult<()>

Apply the given write batch. As write(), but allows specifying the write options to use for this operation.

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

If the database contains an entry for “key”, return the associated value

• otherwise, return None. This value is wrapped in a Result to indicate if an error occurred.

pub fn get_opts( &self, key: &[u8], opts: DBReadOptions, ) -> LevelDBResult<Option<Vec<u8>>>

Get the value for a given key. As get(), but allows specifying the options to use when reading.

pub fn iter(&mut self) -> LevelDBResult<DBIterator>

Return an iterator over the database.

pub fn snapshot(&self) -> DBSnapshot

Return a snapshot of the database.

Trait Implementations

impl Clone for DB

fn clone(&self) -> DB

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Send for DB

impl Sync for DB