Transactions in codeigniter with multiple tables - mysql

Question

I'm new to transactions in general, but especially with CodeIgniter. I'm using InnoDB and everything, but my transactions aren't rolling back when I want them to. Here's my code (slightly simplified).
$dog_db = $this->load->database('dog', true);
$dog_db->trans_begin();
$dog_id = $this->dogs->insert($new_dog); //Gets primary key of insert
if(!$dog_id)
{
$dog_db->trans_rollback();
throw new Exception('We have had an error trying to add this dog. Please go back and try again.');
}
$new_review['dog_id'] = $dog_id;
$new_review['user_id'] = $user_id;
$new_review['date_added'] = time();
if(!$this->reviews->insert($new_review)) //If the insert fails
{
$dog_db->trans_rollback();
throw new Exception('We have had an error trying to add this dog. Please go back and try again.');
}
//ADD DESCRIPTION
$new_description['description'] = $add_dog['description'];
$new_description['dog_id'] = $dog_id;
$new_description['user_id'] = $user_id;
$new_description['date_added'] = time();
if(!$this->descriptions->insert($new_description))
{
$dog_db->trans_rollback();
throw new Exception('We have had an error trying to add this dog. Please go back and try again.');
}
$dog_db->trans_rollback(); //THIS IS JUST TO SEE IF IT WORKS
throw new Exception('We have had an error trying to add this dog. Please go back and try again.');
$dog_db->trans_commit();
}
catch(Exception $e)
{
echo $e->getMessage();
}
I'm not getting any error messages, but it's not rolling back either. It should roll back at that final trans_rollback right before the commit. My models are all on the "dog" database, so I think that the transaction would carry into the models' functions. Maybe you just can't use models like this. Any help would be greatly appreciated! Thanks!

Answer 1

Well, I know this post is antique, but here's my 2 cents:
I don't think this:
if(!$this->descriptions->insert($new_description))
will work, cause the insert function from CI active record always returns TRUE (succeeding or not). If you are using debug mode, CI will stop on error and throw a screen message to the user, but insert function will still returns TRUE.
So, if you're willing to control transactions "manualy" with CI, you'll have to use something like this:
...
$this->db->trans_begin();
$this->db->insert('FOO');
if ($this->db->trans_status() === FALSE){
$this->db->trans_rollback();
}else{
$this->db->trans_commit();
}
Hope this helps someone...sometime....somewhere

Answer 2

Maybe, it's because you connected using $dog_db, and rolling back nonexisting $booze_db transaction ?(or it's a typo?)