Backend

<?php
$koneksi = mysqli_connect("localhost","root","","hutang");

if ($_GET['k'] == 'insert') {
    $nama = $_POST['nama'];
    $umur = $_POST['umur'];
    $query = mysqli_query($koneksi,"INSERT INTO `test`(`nama`, `umur`) VALUES ('$nama','$umur')");
    echo json_encode($query);
}elseif($_GET['k'] == 'show') {
    $query = mysqli_query($koneksi,"SELECT * FROM `test`");
    $data = mysqli_fetch_all($query,MYSQLI_ASSOC);
    echo json_encode($data);
}elseif ($_GET['k'] == 'update') {
    $nama = $_POST['nama'];
    $umur = $_POST['umur'];
    $kode = $_POST['kode'];
    $query = mysqli_query($koneksi,"UPDATE `test` SET `nama`='$nama',`umur`='$umur' WHERE `nama`='$kode'");
    echo json_encode($query);
}else if($_GET['k'] == 'delete') {
    $kode = $_POST['kode'];
    $query = mysqli_query($koneksi,"DELETE FROM `test` WHERE `nama` = '$kode'");
    echo json_encode($query);
}

?>