datascript - Query language

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datascript is a query language created in 2014.

#361on PLDB

10Years Old

Download source code:

git clone https://github.com/tonsky/DataScript

Source Code

Immutable database and Datalog query engine for Clojure, ClojureScript and JS

Tags: queryLanguage
datascript is developed on GitHub and has 5,432 stars
Early development of datascript happened in https://www.patreon.com/tonsky
datascript is written in Bourne shell, Clojure, JavaScript, Markdown, ClojureScript, HTML, YAML, SVG, JSON
1 PLDB concepts link to datascript: Project Mentat

Example from the web:

(require '[datascript.core :as d])

;; Implicit join, multi-valued attribute

(let [schema {:aka {:db/cardinality :db.cardinality/many}}
      conn   (d/create-conn schema)]
  (d/transact! conn [ { :db/id -1
                        :name  "Maksim"
                        :age   45
                        :aka   ["Max Otto von Stierlitz", "Jack Ryan"] } ])
  (d/q '[ :find  ?n ?a
          :where [?e :aka "Max Otto von Stierlitz"]
                 [?e :name ?n]
                 [?e :age  ?a] ]
       @conn))

;; => #{ ["Maksim" 45] }


;; Destructuring, function call, predicate call, query over collection

Language features

Feature	Supported	Example	Token
Comments	✓	; A comment
Line Comments	✓	; A comment	;
Semantic Indentation	X