Codeigniter trans_start() not rolling back all queries - mysql

Question

I have 3 insert queries running between trans_start() and trans_complete(). They are running perfectly fine... The only problem is, when I run rollback before complete it only rollback insert query 1 and 3. These are the only queries rolling back even I tried to change its positions and no success. Please let me know what I am doing wrong? I tried writing queries by $this->db->query(...) instead of using active records but its giving same result...
I have the following code.
$this->db->trans_start();
//insert transaction
$i_data = array(
'user_id' => $app['opp_id']
, 'amount' => $app['total']
, 'type' => 1
, 'feb_bal' => 1
, 'note' => 'Earnings'
);
$this->db->insert('transaction', $i_data);
$tran_id = $this->db->insert_id();
//insert 2
$c_data = array(
'oppt_opp_id' => $app['id']
, 'status' => 0 //closed
);
$this->db->insert('progress', $c_data);
//insert 3
$e_data = array(
'tran_id' => $tran_id
, 'app_id' => $app['id']
, 'type' => 1
, 'status' => 2
);
$this->db->insert('earn_spend', $e_data);
$this->db->trans_rollback();
$this->db->trans_complete();

Answer 1

CodeIgniter's database abstraction allows you to use transactions with
databases that support transaction-safe table types. In MySQL, you'll
need to be running InnoDB or BDB table types rather than the more
common MyISAM.
Documentation: http://ellislab.com/codeigniter/user-guide/database/transactions.html
And could you try following codes? I prepared codes according to the CI document
<?php
$this->db->trans_begin();
//insert transaction
$i_data = array(
'user_id' => $app['opp_id']
, 'amount' => $app['total']
, 'type' => 1
, 'feb_bal' => 1
, 'note' => 'Earnings'
);
$this->db->insert('transaction', $i_data);
$tran_id = $this->db->insert_id();
//insert 2
$c_data = array(
'oppt_opp_id' => $app['id']
, 'status' => 0 //closed
);
$this->db->insert('progress', $c_data);
//insert 3
$e_data = array(
'tran_id' => $tran_id
, 'app_id' => $app['id']
, 'type' => 1
, 'status' => 2
);
$this->db->insert('earn_spend', $e_data);
if ($this->db->trans_status() === FALSE)
{
$this->db->trans_rollback();
}
else
{
$this->db->trans_commit();
}
?>