Re: Yet another idea

["Alexey Parshin" <alexeyp@gmail.com>]

If the list isn't result of the query - it's not related to the
database and should be static.
Most likely, I'd have wrappers for all the queries - to keep 'em
auto-prepared and re-used.

Topic is a UMO. UMOs are stored in umo_version table. There is no name
or title for a UMO in that table, so we need some query to get it.
Otherwise, it's trivial.

2008/7/1 Ilya A. Volynets-Evenbakh <ilya@total-knowledge.com>:
> Where is the guarantee that every object list is direct result of a query?
> Plus, will you have a separate wrapper for every query?
>
> IOW: what class is "topics" object in your example?
>
> Alexey Parshin wrote:
>>
>> I'm seeing a bit differently. The implementation should use not the
>> members of the class but fields in the underlying query. And the
>> parser should just once per loop, converting a template into a vector
>> of pairs of text an following field index, so the template:
>>
>> <A href='HomeServlet?id={uv_id}'> {uv_name} </A>
>>
>> is parsed (once, before the loop) into vector of pairs:
>>
>> { "<A href='HomeServlet?id=", 0 },
>> { "'> ", 1 },
>> { "</A>", -1}
>>
>> The following loop would work really fast cause it doesn't parse anything.
>>
>> Alexey
>>
>> 1 июля 2008 г. 16:12 пользователь Ilya A. Volynets-Evenbakh
>> <ilya@total-knowledge.com> написал:
>>
>>>
>>> In other words, what you are suggesting, is writing wrapper class for
>>> each
>>> possible UMO collection, that would allow easy printing of enumerations
>>> of such objects?
>>>
>>> That may be a good idea, although parsing such templates will be
>>> time consuming, I'm afraid. Another obvious problem is maintaining
>>> such wrappers, whenever object structure changes (e.g. a new field
>>> is added to UMO and needs to be exposed to list generators).
>>>
>>>  Ilya.
>>>
>>> Alexey Parshin wrote:
>>>
>>>>
>>>> Илья,
>>>>
>>>> Я тут подумал над тем, как бы избавиться от C++ циклов в .csp, в пользу
>>>> чего-нибудь более прозрачного, и вот что придумал. Почему бы нам, вместо
>>>> циклов, не предоставить генерацию по шаблону.
>>>>
>>>> Вместо:
>>>>
>>>> for (vector<CTopic>::iterator itor = topics.begin(); itor !=
>>>> topic.end();
>>>> itor++)
>>>>   out << "<A href='TopicServlet?topic_id=" << (*itor)->id << ">"  <<
>>>> itor->title << "'</A>";
>>>>
>>>> сделаем более простое и прозрачное:
>>>>
>>>> topics.forEach("<A href='TopicServlet?topic_id={id}> {title} </A>");
>>>>
>>>> --
>>>> Alexey Parshin,
>>>> http://www.sptk.net
>>>>
>>>
>>>
>>
>>
>>
>>
>
>
>



-- 
Alexey Parshin,
http://www.sptk.net