database connect in clojure

db.clj

(ns learn-lein.core
  (:require [clojure.java.jdbc :as db]
            [jdbc.pool.c3p0 :as pool]))
(def my-db  {:subprotocol "postgresql"
            :subname "//spark3.thedevranch.net:5432/fitbit_heartrate"})

(def my-pool (pool/make-datasource-spec my-db))

(def heartrates (db/query my-pool ["SELECT * FROM activity_journal_minutes LIMIT 10"]))

(doseq [item heartrates] (prn item))
(doseq [item heartrates] (prn item :bpm))

project.clj

(defproject learn_lein "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :license {:name "MIT"
            }
  :dependencies [[org.clojure/clojure "1.8.0"]
                 [org.clojure/java.jdbc "0.7.0-alpha3"]
                 [postgresql/postgresql "9.1-901-1.jdbc4"]
                 [clojure.jdbc/clojure.jdbc-c3p0 "0.3.2"]]
  :main learn-lein.core  )