incremental update with symfony/propel - php

Question

I would like execute a query like this one in symfony using the Propel ORM:
UPDATE ADS SET HITS=HITS+1 WHERE ID=10;
I know that Propel API can let me set a previously fixed value for a column of a given record, but I definitely don't want to retrieve the column value first before issuing an update query since there are concurrent access.
Please, how could I achieve this?
Thanks.

Answer 1

This works in Symfony 1.3/1.4:
in AdsPeer:
public static function incrementHits($id)
{
$con = Propel::getConnection(AdsPeer::DATABASE_NAME);
$query = 'UPDATE hits SET hits + 1 WHERE id = '.$id;
sfContext::getInstance()->getLogger()->crit($query);
$stmt = $con->prepare($query);
$rs = $stmt->execute();
}
To use:
AdsPeer::incrementHits($id);
HTH
Mike

Answer 2

If you like you can do a Select using SQL in propel.
Here's an example:
class BookPeer extends BaseBookPeer {
.
.
.
/**
* Get just the Books that have not been reviewed.
* #return array Book[]
*/
function getUnreviewedBooks() {
$con = Propel::getConnection(DATABASE_NAME);
// if not using a driver that supports sub-selects
// you must do a cross join (left join w/ NULL)
$sql = "SELECT books.* FROM books WHERE ".
"NOT EXISTS (SELECT id FROM review WHERE book_id = book.id)";
$stmt = $con->createStatement();
$rs = $stmt->executeQuery($sql, ResultSet::FETCHMODE_NUM);
return parent::populateObjects($rs);
}
You can try this with update as well.