i use clojure and korma libs.
defn db-search-users
[& {:keys [nick_name max_age min_age page page_size lmt oft]
:or {lmt 10 page_size 10 oft 0 }
:as conditons}]
(let [users-sql (-> (select* users)
(fields :user_name :id :nick_name)
(limit (if (nil? page) lmt page_size))
(offset (if (nil? page) oft (* page page_size))))]
(do
(exec (-> users-sql
need_do_something_here
)
)
)
now i need to add some search conditions to users-sql at
"need_do_something_here",i can describe it in imperative style:
if ( nick_name != nil)
users-sql = (where users-sql (like :nick_name nick_name)
if (max_age != nil)
users-sql = (where uses-sql (> :birthday blabla....))
if (min_age != nil)
users-sql = (where uses-sql (< :birthday blabla....))
how to do this in an elegant way with functional style?
another question is: i think code like: (if (nil? page) lmt page) is ugly.
is there some functions in clojure like (get_default_value_3_if_a_is_null a
3) ?
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