file image tidak terinput di database

saya menggunakan phpmyadmin, saat di local file image dapat terupload. tapi ketika saya upload projectnya di winscp, dan saya coba upload data.. data text masuk ke phpmyaadmin tapi yang data image tidak masuk. saya sudah membuat folder metadata di folder upload.

berikut syntax controllers-nya

function edit($id=0) {
		if ($id < 1) {
			$datanya = array(
				"id"=>$id,
				"indikator"=>"",
				"definisi"=>"",
				"rumus"=>"",
				"interpretasi"=>"",
				"penanggung_jawab"=>"",
				"keterangan"=>"",
				"required"=>"required"
			);
		} else {
			$this->db->where("id", $id);
			$datanya = $this->db->get("metadata")->row_array();
			$datanya['required'] = "";
		}

		$d['url'] = $this->url;
		$d['data'] = $datanya;
		$d['p'] = "form";
		$d['title'] = "Metadata";
		$d['menu_aktif'] = 5;
		$d['bredkum'] = bredkum(array("metadata"=>$d['title']), "metadata");

		$this->load->view('template', $d);
	}
	function detail($id=0) {
		if ($id < 1) {
			$datanya = array(
				"id"=>$id,
				"indikator"=>"",
				"definisi"=>"",
				"rumus"=>"",
				"interpretasi"=>"",
				"penanggung_jawab"=>"",
				"keterangan"=>"",

				"required"=>"required"
			);
		} else {
			$this->db->where("id", $id);
			$datanya = $this->db->get("metadata")->row_array();
			$datanya['required'] = "";
		}

		$d['url'] = $this->url;
		$d['data'] = $datanya;
		$d['p'] = "detail";
		$d['title'] = "Metadata";
		$d['menu_aktif'] = 5;
		$d['bredkum'] = bredkum(array("metadata"=>$d['title']), "metadata");
		// echo "<pre>";
		// print_r($d);
		// echo "</pre>";
		// exit;

		$this->load->view('template', $d);
	}

	function save() {

		$p = $this->input->post();
		$id = intval($p['id']);
		$indikator = $p['indikator'];
		$interpretasi = $p['interpretasi'];
		$definisi = $p['definisi'];
		$penanggung_jawab = $p['penanggung_jawab'];
		$keterangan = $p['keterangan'];

		$pdata = array(
			"indikator"=>$indikator,
			"definisi"=>$definisi,
			"interpretasi" => $interpretasi,
			"penanggung_jawab" => $penanggung_jawab,
			"keterangan" => $keterangan,
		);

		if ($id > 0) {

			$rumus='';
			if (isset($_FILES['rumus']['name'])) {
				$config['upload_path'] = './upload/metadata/';
				$config['allowed_types'] = 'jpg|jpeg|png|gif';
				$config['max_size'] = '2048';
				$config['overwrite'] = FALSE;
				$config['remove_space'] = TRUE;
				$config['encrypt_name'] = TRUE;

				$this->load->library('upload');
				$this->upload->initialize($config);

				if($this->upload->do_upload('rumus')){
					$get_file = $this->db->where("id",$id)->get("metadata")->row_array();
					@unlink("./upload/metadata/".$get_file['rumus']);
					$rumus = $this->upload->data('file_name');

				}
			}
			$pdata['rumus'] = $rumus;

			if ($_FILES['rumus']['name'] == '') {
				unset($pdata['rumus']);
			}

			$this->db->set($pdata);
			$this->db->where('id', $id);
			$this->db->update('metadata', $pdata);
		}else{
			$rumus = '';
			if (isset($_FILES['rumus']['name'])) {
				$config['upload_path'] = './upload/metadata/';
				$config['allowed_types'] = 'jpg|jpeg|png|gif';
				$config['max_size'] = '2048';
				$config['overwrite'] = FALSE;
				$config['remove_space'] = TRUE;
				$config['encrypt_name'] = TRUE;

				$this->load->library('upload');
				$this->upload->initialize($config);

				if($this->upload->do_upload('rumus')){
					$rumus = $this->upload->data('file_name');

				}
			}

			$pdata['rumus'] = $rumus;
			$this->db->insert('metadata',$pdata);
		}

		$this->session->set_flashdata('k', '<div class="alert alert-danger">Berhasil mengubah data</div>');
		redirect($this->url);