Upload Image n Input Data ke Database dengan Codeigniter

...
function insert_siswa()
{
$this->load->library("upload");
$this->load->model("model_siswa");
$this->form_validation->set_rules("nis", "NIS", "trim|required|xss_clean");
$this->form_validation->set_rules("nama", "Nama", "trim|required|xss_clean");
$this->form_validation->set_rules("alamat", "Alamat", "trim|required|xss_clean");
if ($this->form_validation->run() == FALSE)
{
$upload_error = array();
$this->load->view("form_insert_siswa", $upload_error);
}
else
{
$config['upload_path'] = './uploads/';
$config['allowed_types'] = 'gif|jpg|png';
$config['max_size']	= '100';
$config['max_width']  = '1024';
$config['max_height']  = '768';
$this->upload->initialize($config);
$field_name = "foto";
if (!$this->upload->do_upload($field_name))
{
$upload_error = array("error" => $this->upload->display_errors());
$this->load->view("form_insert_siswa", $upload_error);
}
else
{
$upload_data = $this->upload->upload_data();
$rec_data = array("nis" => $this->input->post("nis"), "nama" => $this->input->post("nama"), "alamat" => $this->input->post("alamat"), "foto" => $upload_data["full_path"]);
if ($this->model_siswa->insert_siswa($recdata) == TRUE)
{
redirect("siswa/sukses_insert");
}
else
{
redirect("siswa/gagal_insert");
}
}
}
}
...

...
function insert_siswa($data)
{
if ($this->db->insert("table_siswa", $data))
{
return TRUE;
}
else
{
return FALSE;
}
}
...

<p>
<?php
echo isset($upload_error) ? $upload_error : "";
?>
</p>
<?php echo form_open_multipart(current_url());?>
<p>
<?php echo form_label("NIS", "nis");?>
<?php echo form_input(array("name" => "nis", "value" => $this->input->post("nis")));?>
</p>
<p>
<?php echo form_label("NAMA", "nama");?>
<?php echo form_input(array("name" => "nama", "value" => $this->input->post("nama")));?>
</p>
<p>
<?php echo form_label("Alamat", "alamat");?>
<?php echo form_input(array("name" => "alamat", "value" => $this->input->post("alamat")));?>
</p>
<p>
<?php echo form_label("Foto", "foto");?>
<?php echo form_upload(array("name" => "foto"));?>
</p>
<?php echo form_close();?>