Doctrine Why this query return 0 rows?

I have the following DQL query:

$q = Doctrine_Query::create()
    ->select('id')
    ->from('Comment')
    ->where("active='?' AND object_id='?' AND group_name = '?'"
            , array(1, 1, 'unit'));

Which produce the sql:

SELECT c.id AS c__id, c.group_name AS c__group_name, c.name AS c__name,
       c.email AS c__email
  FROM comment c
 WHERE (c.active = '?' AND c.object_id = '?' AN开发者_如何学CD c.group_name = '?')

bindings: 1, 1, unit

In database table:

id user_id object_id group_name name  active
1   0      1         unit       test  1

When I execute de query it returns 0 rows. Why?

If I go in phpmyadmin and I run

SELECT * FROM comment WHERE active=1 AND object_id=1 AND group_name='unit'

the result contains the record I look for.

In phpmyadmin the query generated by Doctrine identify the table name as 'c'. This is very strange, since I used in my application other DQL querys like this one and works.

Thanks.

Remove quotes around parameter placeholders:

where("active=? AND object_id=? AND group_name = ?"

or use named parameters:

where("active= :ative AND object_id= :object_id AND group_name = :group_name"
      , array(':ative'=>1, ':objet_id'=>1, 'group_name'=>'unit')"