Struct Transaction 

pub struct Transaction { /* private fields */ }

A serializable snapshot isolated database transaction

Implementations

impl Transaction

pub fn closed(&self) -> bool

Check if the transaction is closed

pub async fn cancel(&mut self) -> Result<(), Error>

Cancel the transaction and rollback any changes

pub async fn commit(&mut self) -> Result<(), Error>

Commit the transaction and store all changes

pub async fn exists(&self, key: Key) -> Result<bool, Error>

Check if a key exists in the database

pub async fn get(&self, key: Key) -> Result<Option<Val>, Error>

Fetch a key from the database

pub async fn set(&mut self, key: Key, val: Val) -> Result<(), Error>

Insert or update a key in the database

pub async fn put(&mut self, key: Key, val: Val) -> Result<(), Error>

Insert a key if it doesn’t exist in the database

pub async fn putc( &mut self, key: Key, val: Val, chk: Option<Val>, ) -> Result<(), Error>

Insert a key if it matches a value

pub async fn del(&mut self, key: Key) -> Result<(), Error>

Delete a key from the database

pub async fn delc(&mut self, key: Key, chk: Option<Val>) -> Result<(), Error>

Delete a key if it matches a value

pub async fn keys(&self, rng: Range<Key>, limit: u32) -> Result<Vec<Key>, Error>

Retrieve a range of keys from the databases

pub async fn keysr( &self, rng: Range<Key>, limit: u32, ) -> Result<Vec<Key>, Error>

Retrieve a range of keys from the databases in reverse order

pub async fn scan( &self, rng: Range<Key>, limit: u32, ) -> Result<Vec<(Key, Val)>, Error>

Retrieve a range of key-value pairs from the databases

pub async fn scanr( &self, rng: Range<Key>, limit: u32, ) -> Result<Vec<(Key, Val)>, Error>

Retrieve a range of key-value pairs from the databases in reverse order

pub async fn set_savepoint(&mut self) -> Result<(), Error>

Set a savepoint in the transaction for partial rollback This method is stackable and can be called multiple times with corresponding calls to rollback_to_savepoint

pub async fn rollback_to_savepoint(&mut self) -> Result<(), Error>

Rollback the transaction to the most recently set savepoint After calling this method, subsequent modifications within this transaction can be rolled back by calling rollback_to_savepoint again if there are more savepoints in the stack