Hi James,
I really appreciate your code,it really help me much.
just a little modification:
(defn batchly-redis [cmd params]
(doseq [p params]
(apply cmd p)))
doseq requires an even number of args
在 2014年2月25日星期二UTC+8下午6时33分48秒，James Reeves写道：
>
> You could just write it as a function and leave out wcar*.
>
> (defn batchly-redis [cmd params]
> (doseq [params]
> (apply cmd params)))
>
> Then to execute:
>
> (wcar* (batchly-redis cat/set parameters))
>
> As far as I can tell, wcar is just a container macro, like with-open, in
> that it initiates the connection and then cleans up after itself. Within
> wcar, you can execute functions in whatever way you want.
>
> - James
>
>
> On 25 February 2014 09:00, 刘家财 <[email protected] <javascript:>> wrote:
>
>> hi JW,
>> First thank you for your reply.
>> my origin question is somethine about redis.here i refer
>> https://github.com/ptaoussanis/carmine
>> I follow this two line
>> (def server1-conn {:pool {<opts>} :spec {<opts>}}) ; See `wcar`
>> docstring for opts
>>
>> (defmacro wcar* [& body] `(car/wcar server1-conn ~@body))
>>
>> then I can exec some redis commands,but I want to exec commands dynamicly.
>> for example I here a vector [["foo" "bar"]["hello" "world"]]
>> i want to exec following commands
>> (wcar* (car/set "foo" "bar") (car/set "hello" "world"))
>> so i have write a macro like this
>>
>> (defmacro batchly-redis [cmd params]
>> (let [car-fns (map #(cons cmd %) params)]
>> `(wcar* ~@car-fns)))
>>
>>
>> then I can invoke this macro using this way
>> (batchly-redis cat/set [["foo" "bar"]["hello" "world"]])
>> in this way,my macro works ok.but here my vector is coming from the
>> return of other fn ,so as you said above,this will not work, because marco
>> evaluates args at compile time.Do your have some ideas on my problem.
>> Really thanks
>>
>>
>> 在 2014年2月24日星期一UTC+8下午6时29分09秒，Jozef Wagner写道：
>>>
>>> Well the evil thing is that apply-macro evaluates arguments at compile
>>> time. Example where this won't work follows
>>>
>>> (defn foo [numbers]
>>> (apply-macro + numbers))
>>>
>>> JW
>>>
>>>
>>> On Mon, Feb 24, 2014 at 10:27 AM, 刘家财 <[email protected]> wrote:
>>>
>>>> I have one problem using Clojure
>>>> we all know there is a apply for a fn to prepend intervening arguments
>>>> to args.
>>>> such as (apply + [2 3]) will equals to (+ 2 3)
>>>> this is really handy,
>>>> BUT,this is no apply-macro fn to use,I find a contrib(
>>>> https://github.com/clojure/clojure-contrib/blob/
>>>> 73accf597eafb8dfcb642702a3b98b057bbdbbdf/src/main/clojure/
>>>> clojure/contrib/apply_macro.clj#L34) which has somethine like this,but
>>>> deprecated.
>>>> and says it is evil,I can't understand why the docs says it was evil?
>>>> Is there anything harmful? Can someone show me some examples?
>>>> Thank U
>>>>
>>>>
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>>>
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