/**
* Get previous revision Id for this page_id
* This is used to populate rev_parent_id on save
*
* @param IDatabase $db
* @return int
*/
private function getPreviousRevisionId($db)
{
if ($this->mPage === null) {
return 0;
}
# Use page_latest if ID is not given
if (!$this->mId) {
$prevId = $db->selectField('page', 'page_latest', array('page_id' => $this->mPage), __METHOD__);
} else {
$prevId = $db->selectField('revision', 'rev_id', array('rev_page' => $this->mPage, 'rev_id < ' . $this->mId), __METHOD__, array('ORDER BY' => 'rev_id DESC'));
}
return intval($prevId);
}