input.php ( Cara CRUD )

<?php
    if (isset($_POST['submit'])) {
        require_once("koneksi.php");
        $sql = $conn->prepare("INSERT INTO tbl_mahasiswa (nimmhs,namamhs,alamatmhs,teleponmhs,jurusanmhs) VALUES (?, ?, ?, ?, ?)");
        $nimmhs=$_POST['nimmhs'];
        $namamhs = $_POST['namamhs'];
        $alamatmhs= $_POST['alamatmhs'];
        $teleponmhs= $_POST['teleponmhs'];
        $jurusanmhs= $_POST['jurusanmhs'];
        $sql->bind_param("sssss", $nimmhs, $namamhs, $alamatmhs, $teleponmhs, $jurusanmhs);
        if($sql->execute()) {
            $success_message = "Input Data Berhasil";
        } else {
            $error_message = "Ada masalah dengan Penginputan";
        }
        $sql->close();
        $conn->close();
    }
?>
<html>
<head>
<link href="style.css" rel="stylesheet" type="text/css" />

<style>
.tbl-qa{border-spacing:0px;border-radius:4px;border:#6ab5b9 1px solid;}
</style>
  <title>Input Data Mahasiswa</title>
</head>
<body>
<h1>CRUD PHP MySQLi questkomputer.com</h1>
<?php if(!empty($success_message)) { ?>
<div class="success message"><?php echo $success_message; ?></div>
<?php } if(!empty($error_message)) { ?>
<div class="error message"><?php echo $error_message; ?></div>
<?php } ?>
<form id="frmUser" method="post" action="">
<div class="button_link"><a href="index.php"> List Mahasiswa </a></div>
<table border="0" cellpadding="10" cellspacing="0" width="500" align="center" class="tbl-qa">
    <thead>
        <tr>
            <th colspan="2" class="table-header">Input Data Mahasiswa</th>
        </tr>
    </thead>
    <tbody>
        <tr class="table-row">
            <td><label>NIM</label></td>
            <td><input type="text" name="nimmhs" class="txtField"></td>
        </tr>
        <tr class="table-row">
            <td><label>Nama</label></td>
            <td><input type="text" name="namamhs" class="txtField"></td>
        </tr>
        <tr class="table-row">
            <td><label>Alamat</label></td>
            <td><input type="text" name="alamatmhs" class="txtField"></td>
        </tr>
        <tr class="table-row">
            <td><label>Telepon</label></td>
            <td><input type="text" name="teleponmhs" class="txtField"></td>
        </tr>
        <tr class="table-row">
            <td><label>Jurusan</label></td>
            <td><input type="text" name="jurusanmhs" class="txtField"></td>
        </tr>
        <tr class="table-row">
            <td colspan="2"><input type="submit" name="submit" value="Submit" class="demo-form-submit"></td>
        </tr>
    </tbody>
</table>
</form>
</body>
</html>