To store session in database - php

Question

In the below codeigniter code I have placed the controller and model. My aim is to store the session college name in the db. I tried but it is not entering the session college name into db.college_name is in blank.
Controller
function create() {
$j=1;
$createcustomer = $this->input->post('createcustomer');
if( $this->input->post('createcustomer') != false ) {
foreach($createcustomer as $row_id) {
//this is validation command to update on the screen
$this->form_validation->set_rules("exam_name_" . $row_id, "'Exam name'","required");
$this->form_validation->set_rules("month_". $row_id,"`Month`","required");
$this->form_validation->set_rules("year_". $row_id,"`Year`","required","required|");
}
}
if ($this->form_validation->run() == FALSE) {
$data["message"]="";
$this->load->view("exam_view",$data);
} else {
while($j<=$this->uri->segment(3)) {
$data = array(
'exam_name' => $this->input->post('exam_name_'.$j),
'month' => $this->input->post('month_'.$j),
'year' => $this->input->post('year_'.$j)
);
$exam_name=$this->input->post('exam_name_'.$j);
$data1 = $this->session->userdata("college_name");
if ($exam_name != "") {
$this->exam_model->add_record($data,$data1);
// $this->load->view("success_msg",$data);
}
$j++;
} //end of while condition
} //end of if condition
redirect('exam_site', 'refresh');
//$this->index();
}
Model:
function add_record($data,$data1) {
$this->db->insert('exam_table', $data,$data1);
//$this->db->insert('exam_table', $data1);
if ($this->db->_error_number() == 1062) {
$this->session->set_flashdata('duplicate', 'duplicate');
}
if ($this->db->_error_number() == "") {
$this->session->set_flashdata('create', 'create');
}
return;
}

Answer 1

change this:
$this->db->insert('exam_table', $data,$data1);
to this:
$this->db->insert('exam_table', $data);
$this->db->insert('exam_table', $data1);