DELETE FROM component_name
    [WHERE where_condition]
    [ORDER BY ...]
    [LIMIT record_count]

The DELETE statement deletes records from component_name and returns the number of records deleted.
The optional WHERE clause specifies the conditions that identify which records to delete. Without WHERE clause, all records are deleted.
If the ORDER BY clause is specified, the records are deleted in the order that is specified.
The LIMIT clause places a limit on the number of rows that can be deleted. The statement will stop as soon as it has deleted record_count records.


$q    = 'DELETE FROM Account WHERE id > ?';

$rows = $this->conn->query($q, array(3));

// the same query using the query interface

$q = new Doctrine_Query();

$rows = $q->delete('Account')
          ->from('Account a')
          ->where('a.id > ?', 3)
          ->execute();
          
print $rows; // the number of affected rows