#+TITLE: HoneySQL tips & tricks

* Basic statements

#+BEGIN_SRC clojurescript :tangle ./src/core.cljs
#_(ns core.demo
  (:require
   [honey.sql :as sql]
   [honey.sql.helpers :as sqlh]))
#+END_SRC

#+BEGIN_SRC clojurescript :tangle ./src/core.cljs
(clojure.core/into [:a] [1 2 3 4])
#+END_SRC

** Simple table select, with filtering and sorting applied
#+BEGIN_SRC clojurescript
(-> (sqlh/select :*)
    (sqlh/from :company)
    (sqlh/where [:= :id 1]))
#+END_SRC

#+BEGIN_SRC clojurescript :tangle ./src/core.cljs
(sqlh/select :*)
#+END_SRC


** Dynamic where clauses

*** where value exists
=sqlh/where= will only be applied to the query if it has a value so nil on its own will not applied
#+BEGIN_SRC clojurescript :tangle ./src/core.cljs
(defn conditional-where [id] 
  (-> (sqlh/select :*)
      (sqlh/from [:company])
      (sqlh/where (when id [:= :id id]))))

(first (sql/format (conditional-where 1) {:pretty true}))
#+END_SRC

*** Switch between singular or multiple values in condition

#+BEGIN_SRC clojurescript :tangle ./src/core.cljs
(defn conditional-where [id] 
  (-> (sqlh/select :*)
      (sqlh/from [:company])
      (sqlh/where (if (sequential? id) [:in :id id] [:= :id id]))))

(first (sql/format (conditional-where [1 2 3]) {:pretty true}))
;(clojure.string/join "" (sql/format (conditional-where [1 2 3]) {:pretty true}))
#+END_SRC