Yes!!!! akhirnya bisa juga, seneng banget pokoknya udah beberapa minggu ngotak ngatik CI biar bisa connect ke Oracle. Setelah banyak artikel dan video yang di tonton, berhasil juga nge-dump wkwkwkwkw

Jadi selain di CI, di Web Server juga harus dikonfigurasi pdo_oci nya
phpinfo


pokoknya urusan sysadmin dah untuk server mah.

conf db CI

$active_group = 'default';
$query_builder = TRUE;
$db['default'] = array(
'dsn' => 'oci:dbname=//IP:1521/SID;charset=UTF8',
'hostname' => '',
'username' => 'root',
'password' => 'root',
'database' => '',
'dbdriver' => 'pdo',
'dbprefix' => '',
'pconnect' => FALSE,
'db_debug' => (ENVIRONMENT !== 'production'),
'cache_on' => FALSE,
'cachedir' => '',
'char_set' => 'utf8',
'dbcollat' => 'utf8_general_ci',
'swap_pre' => '',
'encrypt' => FALSE,
'compress' => FALSE,
'stricton' => FALSE,
'failover' => array(),
'save_queries' => TRUE
);

hilangkan petik ganda di codeigniter/system/database/DB_driver.php
ubah:
protected $_escape_char = '"';
jadi:
protected $_escape_char = '';

coba nge-dump di controllers Welcome.php
public function index()
{
$this->load->database();
$rs = $this->db->get("NAMA_TABEL")->result();
var_dump($rs);
//$this->load->view('welcome_message');
}


sekian ^_^

http://stackoverflow.com/questions/25649581/oracle-pdo-oci-charset-failing
https://www.youtube.com/watch?v=vS_j5OFaYnE