CIBlockDocument::LockDocument

static function LockDocument($documentId, $workflowId)
{
	global $DB;
	$strSql = "
		SELECT * FROM b_iblock_element_lock
		WHERE IBLOCK_ELEMENT_ID = ".intval($documentId)."
		AND LOCKED_BY = '".$DB->ForSQL($workflowId, 32)."'
	";
	$z = $DB->Query($strSql, false, "FILE: ".__FILE__."
LINE: ".__LINE__);
	if($z->Fetch())
	{
		//Success lock because documentId already locked by workflowId
		return true;
	}
	else
	{
		$strSql = "
			INSERT INTO b_iblock_element_lock (IBLOCK_ELEMENT_ID, DATE_LOCK, LOCKED_BY)
			SELECT E.ID, ".$DB->GetNowFunction().", '".$DB->ForSQL($workflowId, 32)."'
			FROM b_iblock_element E
			LEFT JOIN b_iblock_element_lock EL on EL.IBLOCK_ELEMENT_ID = E.ID
			WHERE ID = ".intval($documentId)."
			AND EL.IBLOCK_ELEMENT_ID IS NULL
		";
		$z = $DB->Query($strSql, false, "FILE: ".__FILE__."
LINE: ".__LINE__);
		return $z->AffectedRowsCount() > 0;
	}
}