My Parameter.yml settings are :
parameters:
    database_driver: pdo_sqlite
    database_host: localhost
    database_port: null
    database_name: ak.db
    database_user: root
    database_password: null
    mailer_transport: smtp
    mailer_host: localhost
    mailer_user: null
    mailer_password: null
    locale: en
    secret: b4289c0b750d5c5b573788d79c4e1d130380ff7d
    database_path: data/ak.db

and config.yml :
# Doctrine Configuration
doctrine:
    dbal:
        driver:   %database_driver%
        host:     %database_host%
        port:     %database_port%
        dbname:   %database_name%
        user:     %database_user%
        password: %database_password%
        path:     %database_path%
        charset:  UTF8

Will you please help me out.
Thanks a ton in advance.

doctrine:
    dbal:
        path: %kernel.root_dir%/src/test/%database_path%