我有一个基于Mochiweb和Mnesia的Erlang网吧,它消费和 em子。 在Mnesia储存记录是有道理的;然而Mochiweb/Mochijson要求以预发格式提供数据。 因此,我最后拿着大量的碎块编码:
-record(foobar, {name, value}).
record_to_proplist(Record)->
[{name, Record#foobar.name},
{value, Record#foobar.value}].
proplist_to_record(Props)->
#foobar{name=proplists:get_value("name", Props),
value=proplists:get_value("value", Props)}.
细微的细微记录是一片大纪录的疼痛。 谁能建议如何整整整整条轮式编码? 我猜测,我需要某种方式,积极检查一个有记录的油田;由于记录是一个汇编时的构造,我猜想[假定可能],这意味着通过宏观手段采用注射法。
感谢!
象权宜之计一样,这是你回想的:
http://forum.tecexit.org/viewtopic.php?p=21790
阅读描述:
The module is a parse transform allowing you to export records. The transform adds accessor functions for instantiating, inspecting and modifying records, without having to introduce compile-time dependencies between modules.
如果有这种帮助的话。
你们应该能够做这样的事情:
-record(foobar, {name, value}iii.
-record(foo, {other, fields, and , stuff}iii.
record_to_proplist(#foobar{} = Reciii ->
lists:zip(record_info(fields, foobariii, tl(tuple_to_list(Reciiiiiiiii;
record_to_proplist(#foo{} = Reciii ->
lists:zip(record_info(fields, fooiii, tl(tuple_to_list(Reciiiiiiiii.
Ec.
(作为宏观(形成一种功能,而宏观是吗?R2P(Rec, foobariii的版本则过于简单iii:
-define(R2P(Recordiii, record_to_proplist(#Record{} = Reciii ->
lists:zip(record_info(fields, Recordiii, tl(tuple_to_list(Reciiiiiiiiiiii.
?R2P(foobariii;
?R2P(fooiii.
iii
利用记录:Info(fields, foobar)可以积极做一些事情。 然而,记录_info也是一份汇编的时间构造,因此,记录名称不能变数,因此,你需要一个条款,用于您打算转换的每个记录。
被接受的答案中的联系已久。
简短的答案是使用Ulf Wiger的开支。
支出是指在uwiger/parse_trans
http://web.archive.org/web/20130729014934/http://forum.tecexit.org/viewtopic.php?p=21790“rel=” http://web.archive.org/web/20130729014934/http://forum.tecexit.org/viewtopic.php?p=21790
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