Clojure wrappers for lmdb - the best no-nonsense, no-surprise, fast key-value store.
make-db
(use 'clj-lmdb.simple :reload)
nil
user> (def db (make-db "/tmp"))
#'user/dbYou can specify the max memory map size as well:
(use 'clj-lmdb.core :reload)
nil
user> (def db (make-db "/tmp" <size_in_bytes>))
#'user/dbget! and put!
user> (put! db "foo" "bar")
nil
user> (get! db "foo")
"bar"
user> delete!
user> (delete! db "foo")
true
user> (get! db "foo")
nil
user>read-txn to create a read-only transaction
write-txn to create a transaction that updates the db
This inserts a couple of entries:
(with-txn [txn (write-txn db)]
(put! db
txn
"foo"
"bar")
(put! db
txn
"foo1"
"bar1"))This retrieves them
(with-txn [txn (read-txn db)]
(= (get! db
txn
"foo")
"bar") ; true
(= (get! db
txn
"foo1")
"bar1")) ; trueInside a read-transaction you can use items or items-from
to iterate over the entries or to iterate from a particular key onwards.
(with-txn [txn (read-txn db)]
(count
(doall
(map
(fn [[k v]]
...)
(items db txn)))))(with-txn [txn (read-txn db)]
(count
(doall
(map
(fn [[k v]]
...)
(items-from db txn "foo")))))Use optional parameters :order :asc or :order :desc (default order is
ascending) in items and items-from function calls to specify ascending or
descending order of the keys.
(with-txn [txn (read-txn db)]
(count
(doall
(map
(fn [[k v]]
...)
(items db txn :order :desc)))))(with-txn [txn (read-txn db)]
(count
(doall
(map
(fn [[k v]]
...)
(items-from db txn "foo" :order :desc)))))For more examples, see the tests
Copyright © 2016 Shriphani Palakodety
Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent