customized query in codeigniter pagination class - codeigniter

Question

I am using codeigniter pagination class and am stuck in this code!
the following code reads the whole columns from the employees table but my query contains a join. I do not really know how I am going to run my own query using the config settings!
$config['per_page'] = 20;
$view_data['view_data'] = $this->db->get('employees', $config['per_page'], $this->uri->segment(3));
My own query:
$this->db->select('emp.code as emp_code,emp.fname as emp_fname,emp.lname as emp_lname,emp.faname as emp_faname,emp.awcc_phone as emp_phone,emp.awcc_email as emp_email,position as position,dep.title as department');
$this->db->from('employees as emp');
$this->db->join('departments as dep','dep.code=emp.department_code');
$this->db->where('emp.status = 1');
$employees_list = $this->db->get();
return $employees_list;

Answer 1

You approach is totally wrong.
In Controller do it like this
$this->load->model('mymodel');
$config['per_page'] = 20;
$view_data['view_data'] = $this->mymodel->getEmployees($config['per_page'], $this->uri->segment(3));
Modle function
function getEmployees($limit = 10 , $offset = 0)
{
$select = array(
'emp.code as emp_code',
'emp.fname as emp_fname',
'emp.lname as emp_lname',
'emp.faname as emp_faname',
'emp.awcc_phone as emp_phone',
'emp.awcc_email as emp_email',
'position as position',
'dep.title as department'
);
$this->db->select($select);
$this->db->from('employees as emp');
$this->db->join('departments as dep','dep.code=emp.department_code');
$this->db->where('emp.status',1);
$this->db->limit($offset , $limit);
return $this->db->get()->result();
}
See this tutorial for usage