datomic question about the `d/db` function

foo.clj

(ns datomic.example
  (:require [datomic.api :as d]))

;; question about the function `d/db`
;;
;; in `example` pull `d/pull` always see the transaction that commits [:db/add id :foo :bar]?

(defn example
  [conn id]
  (do @(d/transact conn [{:db/id id :foo :bar}])
      (d/pull (d/db conn) '[*] id)))
  
(defn exmaple'
  [conn id]
  (let [{:keys [db-after]} @(d/transact conn [{:db/id id :foo :bar}])]
    (d/pull db-after '[*] id)))