<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "belajar";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
//Proses jika suer input
if(isset($_POST['hitung'])) {
$sql = "INSERT INTO `tbl_mahasiswa`( `nama`, `nim`,
 `jurusan`, `semester`, `dosen`) VALUES ('".$_POST['Nama']."',
 '".$_POST['NIM']."','".$_POST['Jurusan']."','".$_POST['semester']."','".$_POST['dosen']."')";

if ($conn->query($sql) === TRUE) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

}

//Proses jika user edit
if(isset($_POST['edit'])) {
    $sql = "UPDATE `tbl_mahasiswa` SET
    `nama`='".$_POST['Nama']."',nim='".$_POST['NIM']."',`jurusan`='".$_POST['Jurusan']."',
    `semester`='".$_POST['semester']."',`dosen`='".$_POST['dosen']."' where idmhs=".$_GET['edit']."";

    if ($conn->query($sql) === TRUE) {
        echo "Data update successfully";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }

    }
// sql to delete a record
if (isset($_GET['idmhs'])) {
$sql = "DELETE FROM `tbl_mahasiswa` WHERE idmhs=".$_GET['idmhs']."";

if ($conn->query($sql) === TRUE) {
    echo "Record deleted successfully";
} else {
    echo "Error deleting record: " . $conn->error;
}
}

//tampilkan data yang akan di edit
//menampilkan Data
$sql = "SELECT * FROM `tbl_mahasiswa` where idmhs=".$_GET['edit']."";
$row =$conn->query($sql)->fetch_assoc();
?>

<form id="form1" name="form1" method="post" action="">
<label for="Nama"></label>
<input type="text" name="Nama" id="Nama" value="<?php echo $row['nama'];?>" placeholder="Nama" />
<label for="NIM"></label>
<input type="text" name="NIM" id="NIM" value="<?php echo $row['nim'];?>" placeholder="NIM" />
<label for="semester"></label>
<input type="text" name="semester" id="semester" value="<?php echo $row['semester'];?>" placeholder="semester" />
<label for="Jurusan"></label>
<input type="text" name="Jurusan" id="Jurusan" value="<?php echo $row['jurusan'];?>" placeholder="Jurusan" />
<label for="dosen"></label>
<input type="text" name="dosen" id="dosen" value="<?php echo $row['dosen'];?>" placeholder="Dosen Pembimbing" />
<?php if(isset($_GET['edit'])) {?>
<input type="submit" name="edit" id="edit" value="Edit" />
<?php } else {?>
    <input type="submit" name="hitung" id="hitung" value="Submit" />
<?php } ?>
</form>
<?php
//menampilkan Data
$sql = "SELECT * FROM `tbl_mahasiswa`";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo "<hr>Nama: " . $row["nama"]. " - NIM: " . $row["nim"]. "<br>
        Semester " . $row["semester"]. "<br>
        Jurusan " . $row["jurusan"]. "<br>
        Dosen Pembimbing " . $row["semester"]. " <a href=?idmhs=" . $row["idmhs"]. ">hapus</a> -
        <a href=?edit=" . $row["idmhs"]. ">edit</a><br>
        ";
    }
} else {
    echo "0 results";
}
$conn->close();
?>