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rdbms.clj
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rdbms.clj
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(ns andrewslai.clj.persistence.rdbms
(:require [camel-snake-kebab.core :as csk]
[camel-snake-kebab.extras :as cske]
[cheshire.core :as json]
[clojure.java.jdbc :as sql]
[clojure.spec.alpha :as s]
[honeysql.core :as hsql]
[honeysql.helpers :as hh]
[next.jdbc :as next]
[next.jdbc.result-set :as rs]
[next.jdbc.sql :as next.sql]
[slingshot.slingshot :refer [throw+ try+]]
[taoensso.timbre :as log])
(:import
org.postgresql.util.PGobject))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; One time configuration - stateful
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(extend-protocol sql/IResultSetReadColumn
org.postgresql.jdbc.PgArray
(result-set-read-column [pgobj metadata i]
(vec (.getArray pgobj)))
PGobject
(result-set-read-column [pgobj conn metadata]
(let [type (.getType pgobj)
value (.getValue pgobj)]
(case type
"json" (json/parse-string value keyword)
:else value))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Connection helpers
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; API for interacting with a relational database
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defn transact!
[conn stmt]
(next/execute! conn stmt {:return-keys true
:builder-fn rs/as-unqualified-kebab-maps}))
(defn select-one
[database m]
(let [result (next/execute! database
(hsql/format m)
{:builder-fn rs/as-unqualified-kebab-maps})]
(case (count result)
1 (first result)
0 nil
result)))
(defn select
[database m]
(next/execute! database
(hsql/format m)
{:builder-fn rs/as-unqualified-kebab-maps}))
(defn validate [type data ex]
(if (s/valid? type data)
true
(throw+
(let [reason (s/explain-str type data)]
{:type ex
:subtype type
:message {:data data
:reason reason
:feedback (or (:feedback data)
reason)}}))))
(defn find-by-keys
([database table query-map]
(next.sql/find-by-keys database
(csk/->snake_case_keyword table)
(cske/transform-keys csk/->snake_case_keyword query-map)
{:builder-fn rs/as-unqualified-kebab-maps})))
(defn make-finder
[table]
(fn getter
([database]
(next/execute! database
[(format "SELECT * FROM %s" (csk/->snake_case_string table))]
{:builder-fn rs/as-unqualified-kebab-maps}))
([database query-map]
(if (empty? query-map)
(getter database)
(find-by-keys database table query-map)))))
(defn insert! [database table m & {:keys [ex-subtype
input-validation]}]
(when input-validation
(validate input-validation m :IllegalArgumentException))
(try+
(transact! database (-> (hh/insert-into table)
(hh/values (if (map? m)
[m]
m))
hsql/format))
(catch org.postgresql.util.PSQLException e
(log/errorf "Caught Exception while inserting: %s" e)
(throw+ (merge {:type :PersistenceException
:message {:data (select-keys m [:username :email])
:reason (.getMessage e)}}
(when ex-subtype
{:subtype ex-subtype}))))
(catch Object e
(log/errorf "Caught Exception while inserting: %s" e)
(throw+ (merge {:type :PersistenceException
:message {:data (select-keys m [:username :email])
:reason (.getMessage e)}}
(when ex-subtype
{:subtype ex-subtype}))))))
(defn update! [database table m where & {:keys [ex-subtype
input-validation]}]
(when input-validation
(validate input-validation m :IllegalArgumentException))
(try+
(transact! database (-> (hh/update table)
(hh/sset m)
(hh/where where)
hsql/format))
(catch org.postgresql.util.PSQLException e
(throw+ (merge {:type :PersistenceException
:message {:data m
:reason (.getMessage e)}}
(when ex-subtype
{:subtype ex-subtype}))))))
(defn delete! [database table ids & {:keys [ex-subtype]}]
(try+
(transact! database (-> (hh/delete-from table)
(hh/where [:in :id (if (coll? ids)
ids
[ids])])
hsql/format))
(catch org.postgresql.util.PSQLException e
(throw+ (merge {:type :PersistenceException
:message {:data ids
:reason (.getMessage e)}}
(when ex-subtype
{:subtype ex-subtype}))))))
(comment
(require '[andrewslai.clj.init.config :as config])
(require '[honeysql.helpers :as hh])
(def example-user
{:id #uuid "f5778c59-e57d-46f0-b5e5-516e5d36481c"
:first_name "Andrew"
:last_name "Lai"
:username "alai"
:avatar nil
:email "andrew@andrew.com"})
(def database
(config/configure-database (System/getenv)))
)