如何使用CodeIgniter DB Forge生成时间戳和日期时间的createdAt和updatedAt？

Question

I would like to have 2 timestamp/datetime fields, createdAt which only contains the time when the record was created but doesn't update constantly if there are updates on the record and updatedAt which generates during the time when the record was created and everytime the record gets updated. It's also said that a record should only contain one timestamp field at least for MySQL?

Here is my migration code:

$this->dbforge->add_field(array(
    'id' => array(
        'type' => 'INT',
        'constraint' => 5,
        'unsigned' => TRUE,
        'auto_increment' => TRUE
    ),
    'name' => array(
        'type' => 'VARCHAR',
        'constraint' => '50',
    ),
    'createdAt TIMESTAMP DEFAULT CURRENT_TIMESTAMP'
));

How is this done using CodeIgniter DB Forge? Any answers are well appreciated. Thanks

Answer 1

Okay I got it, here is my solution:

$this->dbforge->add_field(array(
    'id' => array(
        'type' => 'INT',
        'constraint' => 5,
        'unsigned' => TRUE,
        'auto_increment' => TRUE
    ),
    'name' => array(
        'type' => 'VARCHAR',
        'constraint' => '50',
    ),
    'createdAt timestamp default now()',
    'updatedAt timestamp default now() on update now()'
));