controller

   public function create(){
        $this->load->helper('string');
        $this->load->library('Datatables');
        $this->load->library('table');
        //ini table yang tampung data barang, perhatikan baik-baik
        $tmpl = array('table_open' => '<table id="big_table" border="1" cellpadding="2" cellspacing="1" class="table table-striped table-bordered">');
        $this->table->set_template($tmpl);
        $this->table->set_heading('no_faktur', 'kode_barang', 'kuantity', 'hargabeli','diskon1','diskon2','diskon3','ppn','kode_lokasi_barang','total_bayar','Action');
        $this->load->view('pembelian/form_pembelian', $data);
    }


    public function datatablebarangbelisatuan(){

        $this->load->library('Datatables');
        $this->datatables->select('detail_beli.id, detail_beli.no_faktur, detail_beli.kode_barang, detail_beli.kuantity, detail_beli.hargabeli, detail_beli.diskon1, detail_beli.diskon2, detail_beli.diskon3, detail_beli.ppn, detail_beli.kode_lokasi_barang, detail_beli.total_bayar')
          ->unset_column('detail_beli.id')
           ->add_column('Actions', get_pembeliansatuan('$1'), 'detail_beli.id')
          ->from('detail_beli');
        echo $this->datatables->generate();

    }