Struct InFile

pub struct InFile { /* private fields */ }

A key-value database fulfilling the KeyValueDB trait, living in file. This is generally intended for tests and is not particularly optimized.

Implementations

impl InFile

pub fn open<P: AsRef<Path>>(path: P, num_cols: u32) -> Result<InFile, Error>

Trait Implementations

impl Default for InFile

fn default() -> InFile

Returns the “default value” for a type.

impl KeyValueDB for InFile

fn get(&self, col: u32, key: &[u8]) -> Result<Option<DBValue>>

Get a value by key.

fn get_by_prefix(&self, col: u32, prefix: &[u8]) -> Result<Option<Vec<u8>>>

Get the first value matching the given prefix.

fn write(&self, transaction: DBTransaction) -> Result<()>

Write a transaction of changes to the backing store.

fn iter<'a>( &'a self, col: u32, ) -> Box<dyn Iterator<Item = Result<DBKeyValue>> + 'a>

Iterate over the data for a given column.

fn iter_with_prefix<'a>( &'a self, col: u32, prefix: &'a [u8], ) -> Box<dyn Iterator<Item = Result<DBKeyValue>> + 'a>

Iterate over the data for a given column, returning all key/value pairs where the key starts with the given prefix.

fn transaction(&self) -> DBTransaction

Helper to create a new transaction.

fn io_stats(&self, _kind: Kind) -> IoStats

Query statistics.

fn has_key(&self, col: u32, key: &[u8]) -> Result<bool, Error>

Check for the existence of a value by key.

fn has_prefix(&self, col: u32, prefix: &[u8]) -> Result<bool, Error>

Check for the existence of a value by prefix.