Alexander Bokovoy wrote:
> [...]
> One unique feature of Repligard which I strongly wish to implement, is
> automatic update of IDs which can be found in PHP scripts being
> transferred via Repligard. The issue is in unnecessary identical IDs
> in different databases. Solution is to replace IDs with IDPs when
> dumping and replace them vice versa when other database will be
> updated. It requires lookup table for ID and IDP correspondence but we
> already have it as repository. The main trick is to scan script body
> and change all occurrences of mgd_xxx functions with exact ID
> arguments by their portable equalents. For example, suppose we have
> the following script:
>
> <?php
> $topic=mgd_get_topic(15);
> ?><h1>&(topic.name);</h1><?
> $articles=mgd_list_topic_articles($id);
> while($articles && $articles->fetch())
> {
> ?><b>&(article.title);</b>: &(article.abtract);<br><?
> }
> ?>
>
> It will be changed like this one (the real syntax for writing IDP
> inside PHP scripts will probably differ):
>
> <?php
> $topic=mgd_get_topic(<<@@a65a65a7fae72919283cba3b2@@>>);
> ?><h1>&(topic.name);</h1><?
> $articles=mgd_list_topic_articles($id);
> while($articles && $articles->fetch())
> {
> ?><b>&(article.title);</b>: &(article.abtract);<br><?
> }
> ?>
>
> The only problem which still remains unsolved is when real ID is
> assigned to some variable first and the latter one is used as a
> reference later. But I don't see any solution for it, and this
> technique is not good anyway.
>
> I would like to see any comments for Repligard behaviour.
To solve this problem, we can use a function mgd_xxx_id.
Like:
<?php
// this defines $id as a topic id
$id = mgd_topic_id(15);
$articles=mgd_list_topic_articles($id);
?>
replicated to:
<?php
$id = mgd_topic_id(<<@@a65a65a7fae72919283cba3b2@@>>);
$articles=mgd_list_topic_articles($id);
?>
with:
<?php
function mgd_topic_id($id) {
return $id;
}
?>
Backward compatibility cannot be assumed without small changes.
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