[Mediawiki-l] wfGetDB() how to use it?

[aretai aretai]

Hi,

As there is not much info on wfGetDB() on
http://meta.wikimedia.org/wiki/Writing_a_new_special_page#wfGetDB.28.29
maybe someone could help me with my problem:

I use MW 1.6.7. (MySQL 4) (Yes I know it won't be supported soon so for now
just assume I use any version that is supported;)). I try to get the list of
the pages with a given text so I use a query like:

SELECT page_title FROM page, revision, text WHERE old_text LIKE '%test%' AND
page_latest = rev_id AND rev_text_id = old_id;

To get results for search string Text. It works when I use it within MySQL
environment. However there are some problems with pulling it to Wiki.
To have "SELECT page_title FROM page" I used:

$dbr =& wfGetDB( DB_SLAVE );
$res = $dbr->select( 'page', array('page_title') );
$wgOut->addHTML ("<table>");
$wgOut->addHTML ("<tr><th>Page Title</th>");
while ( $row = $dbr->fetchObject( $res ) ) {
$wgOut->addHTML ("<tr><td>" .
	$row->page_title"</td>");
}
$dbr->freeResult( $res );

However I'm not sure how to handle more advance queries.
thx in advance for help

Regards,
Aretai