config.yml

parameters:
    dynamic.db.name: db1

doctrine:
  dbal:
    default_connection: db1
    connections:
      db1:
        dbname: %dynamic.db.name%
        user: db1_user
        password: xxxxx
        host: localhost
        logging: %kernel.debug%
      db2:
        dbname: db2
        user: db2_user
        password: xxxxxx
        host: localhost
        logging: %kernel.debug%
  orm:
    # the ORM config

config_test.yml

parameters:
    dynamic.db.name: db1_test