Struct keyvaluedb_web::Database

pub struct Database { /* private fields */ }

Database backed by both IndexedDB and in memory implementation.

Implementations

impl Database

pub async fn open( table_name: &str, columns: u32, memory_cached: bool ) -> Result<Database, Error>

Opens the database with the given name, and the specified number of columns (not including the default one).

pub async fn delete(table_name: &str) -> Result<()>

Deletes the database with the given name,

pub fn name(&self) -> String

Get the database name.

pub fn num_columns(&self) -> Result<u32, Error>

Get the number of columns

pub fn version(&self) -> u32

Get the database version.

Trait Implementations

impl Clone for Database

fn clone(&self) -> Database

Returns a copy of the value.

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

Performs copy-assignment from source.

impl KeyValueDB for Database

fn get<'a>( &self, col: u32, key: &'a [u8] ) -> Pin<Box<dyn Future<Output = Result<Option<DBValue>>> + Send + 'a>>

Get a value by key.

fn delete<'a>( &self, col: u32, key: &'a [u8] ) -> Pin<Box<dyn Future<Output = Result<Option<DBValue>>> + Send + 'a>>

Remove a value by key, returning the old value

fn write( &self, transaction: DBTransaction ) -> Pin<Box<dyn Future<Output = Result<(), DBTransactionError>> + Send + 'static>>

Write a transaction of changes to the backing store.

fn iter<'a, T: 'a, F: FnMut(DBKeyValueRef<'_>) -> Result<Option<T>> + Send + Sync + 'a>( &self, col: u32, prefix: Option<&'a [u8]>, f: F ) -> Pin<Box<dyn Future<Output = Result<Option<T>>> + Send + 'a>>

Iterate over the data for a given column. Return all key/value pairs, optionally where the key starts with the given prefix. Iterator closure returns true for more items, false to stop iteration.

fn iter_keys<'a, T: 'a, F: FnMut(DBKeyRef<'_>) -> Result<Option<T>> + Send + Sync + 'a>( &self, col: u32, prefix: Option<&'a [u8]>, f: F ) -> Pin<Box<dyn Future<Output = Result<Option<T>>> + Send + 'a>>

Iterate over the data for a given column. Return all keys, optionally where the key starts with the given prefix. Iterator closure returns true for more items, false to stop iteration.

fn restore(&self, _new_db: &str) -> Result<()>

Attempt to replace this database with a new one located at the given path.

fn transaction(&self) -> DBTransaction

Helper to create a new transaction.

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

Query statistics.

fn has_key<'a>( &self, col: u32, key: &'a [u8] ) -> Pin<Box<dyn Future<Output = Result<bool, Error>> + Send + 'a, Global>>

Check for the existence of a value by key.

fn has_prefix<'a>( &self, col: u32, prefix: &'a [u8] ) -> Pin<Box<dyn Future<Output = Result<bool, Error>> + Send + 'a, Global>>

Check for the existence of a value by prefix.

fn first_with_prefix<'a>( &self, col: u32, prefix: &'a [u8] ) -> Pin<Box<dyn Future<Output = Result<Option<(Vec<u8, Global>, Vec<u8, Global>)>, Error>> + Send + 'a, Global>>

Get the first value matching the given prefix.