在多对多关系学说中查询2

Question

This is driving me crazy.

I have a normal Symfony2 Security System, with User and Role entities with a ManyToMany relation between them.

Lets suppose that i have 3 roles in the database, ROLE_1 , ROLE_2 and ROLE_3 .

How can i retrieve all Users that dont have ROLE_3 for example ?

I already tried something like:

$qb->innerJoin('u.roles', 'r , 'WITH', $qb->expr()->notIn('r.id', ':roles')))
                ->setParameter('roles', array(3));

My Question is, how can i Query in the JoinTable ?

Answer 1

This is more of a SQL question than it is a Symfony or Doctrine question. The first solution that comes to mind is a subquery, although that may or may not be the most efficient way to handle this problem. Something like this:

SELECT username
FROM users
WHERE users.id NOT IN (
    SELECT users.id
    FROM users
    INNER JOIN user_roles
    ON users.id = user_roles.user_id
    INNER JOIN roles
    ON user_roles.role_id = roles.id
    WHERE roles.id NOT IN (1,2)
);

Where 1 and 2 are the IDs of the role you want to include in your results, and user_roles is the bridge table between users and roles.