sled is a high-performance embedded database with
an API that is similar to a
but with several additional capabilities for
assisting creators of stateful systems.
It is fully thread-safe, and all operations are
Trees are supported with the
ACID transactions involving reads and writes to
multiple items are supported with the
method. Transactions may also operate over
docs for more info).
Users may also subscribe to updates on individual
Trees by using the
method, which returns a blocking
updates to keys that begin with the provided
prefix. You may supply an empty prefix to subscribe
(aka read-modify-write operators) are supported. A
merge operator is a function that specifies
how new data can be merged into an existing value
without requiring both a read and a write.
method, you may "push" data to a
and have the provided merge operator combine
it with the existing value, if there was one.
They are set on a per-
Tree basis, and essentially
allow any sort of data structure to be built
using merges as an atomic high-level operation.
sled is built by experienced database engineers
who think users should spend less time tuning and
working against high-friction APIs. Expect
significant ergonomic and performance improvements
over time. Most surprises are bugs, so please
let us know if something
is high friction.
use sled::Db; let t = Db::open("my_db").unwrap(); // insert and get t.insert(b"yo!", b"v1"); assert_eq!(&t.get(b"yo!").unwrap().unwrap(), b"v1"); // Atomic compare-and-swap. t.cas( b"yo!", // key Some(b"v1"), // old value, None for not present Some(b"v2"), // new value, None for delete ) .unwrap(); // Iterates over key-value pairs, starting at the given key. let scan_key: &[u8] = b"a non-present key before yo!"; let mut iter = t.range(scan_key..); assert_eq!(&iter.next().unwrap().unwrap().0, b"yo!"); assert_eq!(iter.next(), None); t.remove(b"yo!"); assert_eq!(t.get(b"yo!"), Ok(None));