Function sdb::btree::put

pub fn put<T, K, V, P>(
    txn: &mut T, 
    db: &mut Db_<K, V, P>, 
    key: &K, 
    value: &V
) -> Result<bool, <T as LoadPage>::Error> where
    K: Storable + Debug + ?Sized,
    V: Storable + Debug + ?Sized,
    T: AllocPage,
    P: BTreeMutPage<K, V>, 

Insert an entry into a database, returning false if and only if the exact same entry (key and value) was already in the database.