datascript

datascript is a query language created in 2014.

#443on PLDB	9Years Old	5.6kUsers
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Immutable database and Datalog query engine for Clojure, ClojureScript and JS

datascript is developed on GitHub and has 4,793 stars
datascript first developed in https://www.patreon.com/tonsky
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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

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

datascript - Query language

Language features