Menampilkan data berdasarkan login di codeigniter

<div>Controller nya&nbsp;<br><br></div><pre>//Start Ajax// public function ajax_list() { $this-&gt;load-&gt;helper('url');

	$list = $this->data_prestasi_model_for_mhs->get_datatables();
	$data = array();
	$no = $_POST['start'];
	foreach ($list as $mhs) {
		$no++;
		$row = array();
		$row[] = '<input type="checkbox" class="data-check" value="'.$mhs->id_prestasi.'">';
		//add html for action
		$row[] = '<a class="btn btn-sm btn-primary" href="javascript:void(0)" title="Edit" onclick="edit_person('."'".$mhs->id_prestasi."'".')"><i class="fas fa-pencil-alt"></i> </a>
				  <a class="btn btn-sm btn-danger" href="javascript:void(0)" title="Hapus" onclick="delete_person('."'".$mhs->id_prestasi."'".')"><i class="fas fa-recycle"></i> </a>';
		
		if($mhs->file_sertifikat)
			$row[] = '<a href="'.base_url('upload/file_sertifikat/'.$mhs->file_sertifikat).'" target="_blank"><img src="'.base_url('upload/file_sertifikat/'.$mhs->file_sertifikat).'" height="60" width="60" class="img-responsive" /></a>';
		else
			$row[] = '<a href="'.base_url('upload/file_sertifikat/no_file_available.png').'" target="_blank"><img src="'.base_url('upload/file_sertifikat/no_file_available.png').'" height="60" width="60" class="img-responsive" /></a>';
		
        $row[] = $mhs->username;
        $row[] = $mhs->namamahasiswa;
        $row[] = $mhs->nm_tingkatprestasi;
        $row[] = $mhs->nm_jenisprestasi;
        $row[] = $mhs->nm_prestasi;
        $row[] = $mhs->instansi_prestasi;
        $row[] = $mhs->lokasi;
        $row[] = $mhs->ket_kegiatan;
        $row[] = $mhs->created;
        $row[] = $mhs->updated;
		
		$data[] = $row;
	}

	$output = array(
					"draw" => $_POST['draw'],
					"recordsTotal" => $this->data_prestasi_model_for_mhs->count_all(),
					"recordsFiltered" => $this->data_prestasi_model_for_mhs->count_filtered(),
					"data" => $data,
			);
	//output to json format
	echo json_encode($output);
}
//End Ajax//</pre>

<div>Modelnya</div><pre>class Data_prestasi_model_for_mhs extends CI_Model {

// start datatables
var $table = 'tbl_prestasi_mahasiswa';
var $column_order = array(null, 'username', 'namamahasiswa', 'nm_tingkatprestasi', 'nm_jenisprestasi', 'nm_prestasi', 'instansi_prestasi', 'lokasi', 'ket_kegiatan', 'lama_kegiatan_sertifikat', 'file_sertifikat', 'created', 'updated'); //set column field database for datatable orderable
var $column_search = array('user_name', 'nm_lengkap_mahasiswa', 'nm_tingkat_prestasi', 'nm_jenis_prestasi'); //set column field database for datatable searchable
var $order = array('id_prestasi' => 'asc'); // default order

private function _get_datatables_query() {
$this->db->select('*, tbl_mahasiswa.user_name as username, tbl_mahasiswa.nm_lengkap_mahasiswa as namamahasiswa, tbl_tingkat_prestasi.nm_tingkat_prestasi as nm_tingkatprestasi, tbl_jenis_prestasi.nm_jenis_prestasi as nm_jenisprestasi');
    $this->db->from('tbl_prestasi_mahasiswa');
    $this->db->join('tbl_mahasiswa', 'tbl_prestasi_mahasiswa.id_mahasiswa = tbl_mahasiswa.id_mahasiswa', '');
    $this->db->join('tbl_tingkat_prestasi', 'tbl_prestasi_mahasiswa.id_tingkat_prestasi = tbl_tingkat_prestasi.id_tingkat_prestasi');
    $this->db->join('tbl_jenis_prestasi', 'tbl_prestasi_mahasiswa.id_jenis_prestasi = tbl_jenis_prestasi.id_jenis_prestasi');

    $i = 0;
    foreach ($this->column_search as $tenaga_pengajar) { // loop column
        if(@$_POST['search']['value']) { // if datatable send POST for search
            if($i===0) { // first loop
                $this->db->group_start(); // open bracket. query Where with OR clause better with bracket. because maybe can combine with other WHERE with AND.
                $this->db->like($tenaga_pengajar, $_POST['search']['value']);
            } else {
                $this->db->or_like($tenaga_pengajar, $_POST['search']['value']);
            }
            if(count($this->column_search) - 1 == $i) //last loop
                $this->db->group_end(); //close bracket
        }
        $i++;
    }
     
    if(isset($_POST['order'])) { // here order processing
        $this->db->order_by($this->column_order[$_POST['order']['0']['column']], $_POST['order']['0']['dir']);
    }  else if(isset($this->order)) {
        $order = $this->order;
        $this->db->order_by(key($order), $order[key($order)]);
    }
}
function get_datatables() {
    $this->_get_datatables_query();
    if(@$_POST['length'] != -1)
    $this->db->limit(@$_POST['length'], @$_POST['start']);
    $query = $this->db->get();
    return $query->result();
}
function count_filtered() {
    $this->_get_datatables_query();
    $query = $this->db->get();
    return $query->num_rows();
}
function count_all() {
    $this->db->from('tbl_prestasi_mahasiswa');
    return $this->db->count_all_results();
}
// end datatables</pre>

<div>saya menggunakan jquery datatable. terimakasih mohon pencerahaannya</div>