How to use sqlite database on symfony2 project?

Question

In a Symfony2 project, you can configure the databases connections at the app/config/parameters.ini file. Documentation states that you can use, among others, sqlite3 PDO dr

Answer 1

In my case setting a username and password in config/packages/doctrine.yaml did not create a username/password protected sqlite database.

doctrine:
    dbal:
        charset:  UTF8
        url: '%DATABASE_URL%'
        user:     'foo'
        password: 'bar'

It seems like the parameters username and password are ignored?