using `next.jdbc`, how would it be possible to do batch-upsert (with column insertion), something like this: (this would work using java.jdbc)

(jdbc/execute! db ["INSERT INTO T(col1, col2) 
                    VALUES (?, ?)
                    ON DUPLICATE KEY UPDATE
                    col2=values(col2)"
                   [["c1" "c2"]
                    ["c3" "c4"]]....more here] {:multi? true})

@aviv next.jdbc/execute-batch! is what you're looking for I think. And you'd pass in that same string that you did for c.j.j. To build that string, HoneySQL is what you probably want (but ON DUPLICATE KEY is MySQL I believe and not supported directly yet, but there is an open issue for it).