Trait SubstateDatabase 

pub trait SubstateDatabase {
    // Required methods
    fn get_raw_substate_by_db_key(
        &self,
        partition_key: &DbPartitionKey,
        sort_key: &DbSortKey,
    ) -> Option<Vec<u8>>;
    fn list_raw_values_from_db_key(
        &self,
        partition_key: &DbPartitionKey,
        from_sort_key: Option<&DbSortKey>,
    ) -> Box<dyn Iterator<Item = (DbSortKey, Vec<u8>)> + '_>;
}

A read interface between Track and a database vendor.

Required Methods

fn get_raw_substate_by_db_key( &self, partition_key: &DbPartitionKey, sort_key: &DbSortKey, ) -> Option<Vec<u8>>

Reads a substate value by its db partition and db sort key, or Option::None if missing.

Alternatives

It’s likely easier to use the get_substate or get_raw_substate methods instead, which allow providing logical keys. These methods should also exist on the database type as long as the SubstateDatabaseExtensions trait is in scope.

fn list_raw_values_from_db_key( &self, partition_key: &DbPartitionKey, from_sort_key: Option<&DbSortKey>, ) -> Box<dyn Iterator<Item = (DbSortKey, Vec<u8>)> + '_>

Iterates over all entries of the given partition (starting either from the beginning, or from the given DbSortKey), in a lexicographical order (ascending) of the DbSortKeys. Note: If the exact given starting key does not exist, the iteration starts with its immediate successor.

Alternatives

There are lots of methods starting list_ which allow iterating using more intuitive abstractions. These methods are present as long as the SubstateDatabaseExtensions trait is in scope.

Implementations on Foreign Types

impl<D> SubstateDatabase for StateTreeUpdatingDatabase<D>

where D: SubstateDatabase,

fn get_raw_substate_by_db_key( &self, partition_key: &DbPartitionKey, sort_key: &DbSortKey, ) -> Option<Vec<u8>>

fn list_raw_values_from_db_key( &self, partition_key: &DbPartitionKey, from_sort_key: Option<&DbSortKey>, ) -> Box<dyn Iterator<Item = (DbSortKey, Vec<u8>)> + '_>

impl<S, D> SubstateDatabase for SubstateDatabaseOverlay<S, D>

where S: Borrow<D>, D: SubstateDatabase,

fn get_raw_substate_by_db_key( &self, partition_key: &DbPartitionKey, sort_key: &DbSortKey, ) -> Option<Vec<u8>>

fn list_raw_values_from_db_key( &self, partition_key: &DbPartitionKey, from_sort_key: Option<&DbSortKey>, ) -> Box<dyn Iterator<Item = (DbSortKey, Vec<u8>)> + '_>

Implementors

impl SubstateDatabase for FlashSubstateDatabase

impl SubstateDatabase for InMemorySubstateDatabase