Trait ethcore::db::Readable[−][src]

pub trait Readable {
    fn read<T, R>(
        &self, 
        col: Option<u32>, 
        key: &Key<T, Target = R>
    ) -> Option<T>
    where
        T: Decodable,
        R: Deref<Target = [u8]>;

    fn exists<T, R>(&self, col: Option<u32>, key: &Key<T, Target = R>) -> bool
    where
        R: Deref<Target = [u8]>;

    fn read_with_cache<K, T, C>(
        &self, 
        col: Option<u32>, 
        cache: &RwLock<C>, 
        key: &K
    ) -> Option<T>
    where
        K: Key<T> + Eq + Hash + Clone,
        T: Clone + Decodable,
        C: Cache<K, T>,
    { ... }

    fn exists_with_cache<K, T, R, C>(
        &self, 
        col: Option<u32>, 
        cache: &RwLock<C>, 
        key: &K
    ) -> bool
    where
        K: Eq + Hash + Key<T, Target = R>,
        R: Deref<Target = [u8]>,
        C: Cache<K, T>,
    { ... }
}

Should be used to read values from database.

Required Methods

Returns value for given key.

Returns true if given value exists.

Provided Methods

Returns value for given key either in cache or in database.

Returns true if given value exists either in cache or in database.

Implementors