CodeIgniter - Additional dbforge / migration fields

问题

Im having trouble figuring out this migrations business for CodeIgniter ... I cant find any decent documentation that explains additional field elements like current_timestamp, default datetime values etc etc

I was wondering if someone could help me out to translate the following into proper dbforge->add_field arrays

I need the following 2

`last_login` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP

and

`created` datetime NOT NULL DEFAULT '0000-00-00 00:00:00'

I have copied these from the SQL insert statement from the tank_auth library.

But i want to put it into migrations now.

Cheers,

回答1:

for number 1 you can use

$this->dbforge->add_field('last_login TIMESTAMP');

or

$data = array(
 'type' => 'TIMESTAMP'
);

This auto inserts ON UPDATE CURRENT_TIMESTAMP

回答2:

I think you may be out of luck. These are the available options to dbforge:

Additionally, the following key/values can be used:

unsigned/true : to generate "UNSIGNED" in the field definition.
default/value : to generate a default value in the field definition.
null/true : to generate "NULL" in the field definition. Without this, the field will >     default to "NOT NULL".
auto_increment/true : generates an auto_increment flag on the field. Note that the >     field type must be a type that supports this,
such as integer

You may have to pass a standard query. $this->db->query('YOUR QUERY HERE'); may be what you need.

来源：https://stackoverflow.com/questions/12685986/codeigniter-additional-dbforge-migration-fields