doseq does not have anything precisely like C/Java/Perl/etc.'s 'break' or
'continue'. The closest thing might be the :while keyword. You can see
some one example of its use near the end of the examples on this page:
http://clojuredocs.org/clojure.core/doseq
The best way I know to get such behavior is to use Clojure's loop, where
if/when/whatever-conditional-statements-you-wish can used to control
explicitly to do another loop iteration using recur, or not.
Andy
On Wed, Feb 25, 2015 at 8:59 AM, Cecil Westerhof <cldwester...@gmail.com>
wrote:
> At the moment I have the following function:
> (defn do-show-table
> [table]
> (doseq [{:keys [table_name]} (show-tables db-spec)]
> (when (= (lower-case table) (lower-case table_name))
> (let [format "%-20s %-30s %-5s %-5s %-20s\n"]
> (printf format "Field" "Type" "Null?" "Key" "Default")
> (doseq [{:keys [field type null key default]}
> (jdbc/query db-spec [(str "SHOW COLUMNS FROM "
> table)])]
> (printf format field type null key default))))))
>
> In this case it is not very important, because the outer sequence will not
> be very big. But I would like to leave the doseq at the moment that the
> when is executed. It will be done 0 or 1 times, so after it is done, there
> is no use in continuing the sequence walk.
>
> The second part is that I would like to do an action if it is done 0 times
> after the doseq. Is this possible?
>
> --
> Cecil Westerhof
>
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