cMQL

• query and data processing language for MongoDB
• up to 3x less code
• simple structure
• simple notation

Usage

• as tool to generate MQL usable from all drivers
• to call cMQL code directly from Java/NodeJS/Clojure/Clojurescript

Getting Started

• Documentation
• Try it online, see many examples
• cMQL chat server

Example

(q (= :bedrooms 1)
   (= :country.code "GR")
   (group {:_id :stars}
          {:average-price (avg :price)})
   (sort :average-price)
   (limit 1))

Generates

aggregate(
[{"$match":
   {"$expr":
     {"$and":
       [{"$eq": ["$bedrooms", 1]},
        {"$eq": ["$country.code", "GR"]}]}}},
 {"$group": {"_id": "$stars",
             "average-price": {"$avg": "$price"}}},
 {"$sort": {"average-price": 1}},
 {"$limit": 1}])

cMQL projects

• org.cmql/cmql-core
• org.cmql/cmql-j
• org.cmql/cmql-js

cMQL example apps

• Clojure
• Java
• Clojurescript
• NodeJS

Leiningen dependencies

Java or Clojure programmers use cmql-j

[org.cmql/cmql-core "0.2.0-SNAPSHOT"]
[org.cmql/cmql-j "0.2.0-SNAPSHOT"]

JS or Clojurescript programmers use cmql-js

[org.cmql/cmql-core "0.2.0-SNAPSHOT"]
[org.cmql/cmql-js "0.2.0-SNAPSHOT"]

License

Copyright © 2020,2022 Takis Karyadis.
Distributed under the Eclipse Public License version 1.0.