04 frame part 3 - button refresh

    private void btn_refreshActionPerformed(java.awt.event.ActionEvent evt) {
        Pert3_NPM connect = new Pert3_NPM();
        ResultSet data = null;
        int jumbaris = 0;
        int i = 0;

        String query="select * from barang";
        try{
            data=connect.getStatement().executeQuery(query);
            while(data.next()){
                jumbaris++;
            }
        }catch(SQLException ex){

        }
        String isi[][]=new String[jumbaris][5];
        try{
            data=connect.getStatement().executeQuery(query);
            while(data.next()){
                isi[i][0]=data.getString("kd_barang"); //kd_barang adalah nama field pada table barang di database gudang
                isi[i][1]=data.getString("nama_brg");
                isi[i][2]=data.getString("harga_brg");
                isi[i][3]=data.getString("stok_brg");
                i++;
            }
        }catch(SQLException ex){

        }
        String namakolom[]={"Kode","Nama_Barang","Harga","Jml_Stok"}; //penamaan kolom header tabel
        DefaultTableModel model = new DefaultTableModel(isi,namakolom){};
        tbl_gudang.setModel(model); //tbl_gudang adalah nama variabel dari JTable untuk menampilkan data
    }