add duplicate item iterator

without.crypto
Dan Burkert 10 years ago
parent a2abd18460
commit 1b2dbfc6e7
  1. 12
      src/cursor.rs

@ -89,6 +89,12 @@ pub trait CursorExt<'txn> : Cursor<'txn> + Sized {
self.get(Some(key), None, ffi::MDB_SET_RANGE).unwrap();
IterDup::new(self.cursor(), ffi::MDB_GET_CURRENT)
}
/// Iterate over the duplicates of the item in the database with the given key.
fn iter_dup_of(&mut self, key: &[u8]) -> LmdbResult<Iter<'txn>> {
try!(self.get(Some(key), None, ffi::MDB_SET));
Ok(Iter::new(self.cursor(), ffi::MDB_GET_CURRENT, ffi::MDB_NEXT_DUP))
}
}
impl<'txn, T> CursorExt<'txn> for T where T: Cursor<'txn> {}
@ -473,8 +479,12 @@ mod test {
assert_eq!(items.clone().into_iter().skip(3).collect::<Vec<(&[u8], &[u8])>>(),
cursor.iter_dup_from(b"ab").flat_map(|x| x).collect::<Vec<_>>());
}
assert_eq!(items.clone().into_iter().skip(3).take(3).collect::<Vec<(&[u8], &[u8])>>(),
cursor.iter_dup_of(b"b").unwrap().collect::<Vec<_>>());
assert!(cursor.iter_dup_of(b"foo").is_err());
}
#[test]
fn test_put_del() {

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