->rs (clj)

  What's left to be tested:
  * ReadableColumn protocol extension point"
  (:require [clojure.core.protocols :as core-p]
            [clojure.datafy :as d]
            [clojure.string :as str]
            [clojure.test :refer [deftest is testing use-fixtures]]
            [next.jdbc.protocols :as p]
            [next.jdbc.result-set :as rs]
            [next.jdbc.specs :as specs]
            [next.jdbc.test-fixtures :refer [with-test-db ds column
                                              default-options
                                              derby? mssql? mysql? postgres?]])
  (:import (java.sql ResultSet ResultSetMetaData)))

(defn fruit-builder [^ResultSet rs ^ResultSetMetaData rsmeta]
  (reify
    rs/RowBuilder
    (->row [_] (->Fruit (.getObject rs "id")
                        (.getObject rs "name")
                        (.getObject rs "appearance")
                        (.getObject rs "cost")
                        (.getObject rs "grade")))
    (column-count [_] 0) ; no need to iterate over columns
    (with-column [_ row i] row)
    (with-column-value [_ row col v] row)
    (row! [_ row] row)
    rs/ResultSetBuilder
    (->rs [_] (transient []))
    (with-row [_ rs row] (conj! rs row))
    (rs! [_ rs] (persistent! rs))
    clojure.lang.ILookup ; only supports :cols and :rsmeta
    (valAt [this k] (get this k nil))
    (valAt [this k not-found]
      (case k
        :cols [:id :name :appearance :cost :grade]
        :rsmeta rsmeta
        not-found))))