Tip: How to Add Timestamp With CURRENT_DATETIME in Doctrine 2 ORM

Assuming that your database profiler is Mysql:

    /**
     * @ORM\Column(type="datetime", nullable=false)
     * @ORM\Version
     * @var string
     */
    protected $creationTimestamp;

The above declaration should produce:

CREATE TABLE mytable (creationTimestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL);

The trick is adding @Version which converts the type 'datetime' to 'timestamp'. Remember that this is only for MySql profiler.