how to cal store procedure in codeginter 2.x

[eluser]teddy[/eluser]
I read some topics and confuse way to call mysql store procedure, I don't know where is my wrong if I did like below

1. change to $db['default']['dbdriver'] = 'mysqli';
2. $db['default']['pconnect'] = TRUE; ???? exactly set is FALSE or TRUE, current I set FALSE

after make it all I get error when call a second store procedure, first store procedure is ok

Fatal error: Call to a member function result() on a non-object in ....


Model

Code:

return $this->db->query('call get_loai_deal()')->result();

Other question I want, can I get result_array when call $this->db->query('call store procedure')->result_array()