Fixes #289 by implementing USING

src/honey/sql.cljc

@@ -18,7 +18,7 @@
   "The (default) order for known clauses. Can have items added and removed."
   [:nest :with :with-recursive :intersect :union :union-all :except :except-all
    :select :select-distinct :insert-into :update :delete :delete-from :truncate
-   :columns :set :from
+   :columns :set :from :using
    :join :left-join :right-join :inner-join :outer-join :full-join
    :cross-join
    :where :group-by :having :order-by :limit :offset :for :values
@@ -401,6 +401,7 @@
          :columns         #'format-columns
          :set             #'format-set-exprs
          :from            #'format-selects
+         :using           #'format-selects
          :join            #'format-join
          :left-join       #'format-join
          :right-join      #'format-join

src/honey/sql/helpers.cljc

@@ -61,6 +61,7 @@
 (defn columns [& args] (generic :columns args))
 (defn set [& args] (generic-1 :set args))
 (defn from [& args] (generic :from args))
+(defn using [& args] (generic :using args))
 (defn join [& args] (generic :join args))
 (defn left-join [& args] (generic :left-join args))
 (defn right-join [& args] (generic :right-join args))

test/honey/sql_test.cljc

@@ -354,6 +354,15 @@
               :where [:= :t1.bar 42]}
              (format {:dialect :mysql})))))
 
+(deftest delete-using
+  (is (= ["DELETE FROM films USING producers WHERE (producer_id = producers.id) AND (producers.name = ?)" "foo"]
+         (-> {:delete-from :films
+              :using [:producers]
+              :where [:and
+                      [:= :producer_id :producers.id]
+                      [:= :producers.name "foo"]]}
+             (format)))))
+
 (deftest truncate-test
   (is (= ["TRUNCATE `foo`"]
          (-> {:truncate :foo}