Trait DbTx

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pub trait DbTx: Debug + Send {
    type Cursor<T: Table>: DbCursorRO<T> + Send;
    type DupCursor<T: DupSort>: DbDupCursorRO<T> + DbCursorRO<T> + Send;

    // Required methods
    fn get<T: Table>(
        &self,
        key: T::Key,
    ) -> Result<Option<T::Value>, DatabaseError>;
    fn get_by_encoded_key<T: Table>(
        &self,
        key: &<T::Key as Encode>::Encoded,
    ) -> Result<Option<T::Value>, DatabaseError>;
    fn commit(self) -> Result<(), DatabaseError>;
    fn abort(self);
    fn cursor_read<T: Table>(&self) -> Result<Self::Cursor<T>, DatabaseError>;
    fn cursor_dup_read<T: DupSort>(
        &self,
    ) -> Result<Self::DupCursor<T>, DatabaseError>;
    fn entries<T: Table>(&self) -> Result<usize, DatabaseError>;
    fn disable_long_read_transaction_safety(&mut self);
}

Expand description

Read only transaction

Required Associated Types§

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type Cursor<T: Table>: DbCursorRO<T> + Send

Cursor type for this read-only transaction

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type DupCursor<T: DupSort>: DbDupCursorRO<T> + DbCursorRO<T> + Send

DupCursor type for this read-only transaction

Required Methods§

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fn get<T: Table>(&self, key: T::Key) -> Result<Option<T::Value>, DatabaseError>

Get value by an owned key

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fn get_by_encoded_key<T: Table>( &self, key: &<T::Key as Encode>::Encoded, ) -> Result<Option<T::Value>, DatabaseError>

Get value by a reference to the encoded key, especially useful for “raw” keys that encode to themselves like Address and B256. Doesn’t need to clone a reference key like get.

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