Datahike with Firebase as data storage.
For datahike-firebase you will need to create a Realtime Database on Firebase and store the service account credentials in the an environment variable.
[alekcz/datahike-firebase "0.5.1506"]
After including the datahike API and the datahike-firebase namespace, you can use the Firebase backend now using the keyword :firebase
(ns project.core
(:require [datahike.api :as d]
[datahike-firebase.core]))
;; Create a config map with firebase as storage medium
(def config {:store {:backend :firebase
:env "GOOGLE_APPLICATION_CREDENTIALS" ;environment variable with services account details
:db "https://firebase-db-name.firebaseio.com" ;
:root "datahike"}
:schema-flexibility :read
:keep-history? false})
(def config2 {:store {:backend :firebase
:db "http://localhost:9000" ;connect to the local emulator
:root "datahike"}
:schema-flexibility :read
:keep-history? false})
;; Create a database at this place, by default configuration we have a strict
;; schema and temporal index
(d/create-database config)
(def conn (d/connect config))
;; The first transaction will be the schema we are using:
(d/transact conn [{:db/ident :name
:db/valueType :db.type/string
:db/cardinality :db.cardinality/one }
{:db/ident :age
:db/valueType :db.type/long
:db/cardinality :db.cardinality/one }])
;; Let's add some data and wait for the transaction
(d/transact conn [{:name "Alice", :age 20 }
{:name "Bob", :age 30 }
{:name "Charlie", :age 40 }
{:age 15 }])
;; Search the data
(d/q '[:find ?e ?n ?a
:where
[?e :name ?n]
[?e :age ?a]]
@conn)
;; #{[4 "Bob" 30] [5 "Charlie" 40] [3 "Alice" 20]}
;; Clean up the database if it is not needed any more
(d/delete-database config)Copyright © 2020 Alexander Oloo
This program and the accompanying materials are made available under the terms of the Eclipse Public License 2.0 which is available at http://www.eclipse.org/legal/epl-2.0.
This Source Code may also be made available under the following Secondary Licenses when the conditions for such availability set forth in the Eclipse Public License, v. 2.0 are satisfied: GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version, with the GNU Classpath Exception which is available at https://www.gnu.org/software/classpath/license.html.