Just came across this - it looks very cool! Alan On Sat, Dec 10, 2016 at 7:14 AM, Timothy Baldridge <tbaldri...@gmail.com> wrote:
> I just released the first official version of Odin ( > https://github.com/halgari/odin). Odin is a declarative, extensible query > DSL for Clojure that leverages transducers to provide a high amount of > generality while still maintaining acceptable performance. > > One of the biggest features of Odin is its ability to rapidly index and > query "normal" Clojure data structures. Here is a quick example of this > feature in practice: > > (let [orders [{:customer/name "Sam" > :customer/id 3411} > {:customer/id 3411 > :order/items {1212 3}} > {:customer/id 3411 > :order/items {2232 2 4242 3}} > {:item/id 1212 > :item/price 40.0} > {:item/id 2232 > :item/price 100} > {:item/id 4242 > :item/price 1.99}]] > (->> (o/for-query > (o/and > (d/query orders ?customer :customer/name "Sam") > (d/query orders ?customer :customer/id ?id) > (d/query orders ?order :customer/id ?id) > (d/query-in orders ?order [:order/items ?item-id] ?qty) > (d/query orders ?item :item/id ?item-id) > (d/query orders ?item :item/price ?price)) > (* ?qty ?price)) > (reduce + 0))) > > ;; => 325.97 > > > In this example we are given a vector of maps, we are then finding a customer > by name, > > then walking a path through the data to find all the items that customer > ordered, the > > total price is then calculated via the normal multiply and sum. > > > There are several other features supported by Odin, including transformation > of data > > (based on a query), tabling, Datomic support, and much more. > > > I also did a video series on the development process of Odin if anyone is > interested: > (https://www.youtube.com/watch?v=JyKySmcTR4g) > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
