用于从表中删除行的按钮-PHP SQL

Question

I have a web page that outputs data from my sql database. Each row has a delete button that should delete the data in this particular row. I am having a issue where when I click the delete button it always deletes the row with the first/lowest ID regardless of which button I click. It doesnt delete the row I want it to delete. Here is my code: HTML

<form action="process.php" method="post">
<?php
$sql = "
    SELECT *
      FROM playerTeam
";
$result = mysqli_query($connection, $sql);
?>      
<table>
    <?php
    if (mysqli_num_rows($result) > 0) {
         while ($row = mysqli_fetch_assoc($result)) { ?>
            <tr>
                <td><input type="text" name="id" value="<?php echo $row['id']?>"></td>
                <td><input type="text" name="fName[]" value="<?php echo $row['firstName']?>"></td>
                <td><input type="text" name="sName[]" value="<?php echo $row['surName']?>"></td>
                <td><input type="text" name="team[]" value="<?php echo $row['team']?>"></td>
                <td><input type="submit" name="delete" value="Delete"></td>
                <td><input type="submit" name="update" value="Update"></td>
            </tr>
            <?php
        }
    } 
    ?>
    </table>
</form>

process.php

if (isset($_POST['delete'])) {
    $id = $_POST['id'];
    $sql = "DELETE FROM playerTeam WHERE id='$id'";

    if (mysqli_query($connection, $sql)) {
        echo "Record deleted";
    } else {
        echo "Error: " . $sql . "<br>" . mysqli_error($connection);
    }
}

please could someone help me. Thanks

Answer 1

Because you delete the value of last id in

$id = $_POST['id'];

$sql = "DELETE FROM playerTeam WHERE id='$id'";

the value of $_POST['id'] is equal to last row in <?php echo $row['id']?> in each run of the while the $_POST['id'] value replaced by new $row['id'] so the last on would be read in $_POST['id']

Answer 2

As you are using while($row = mysqli_fetch_assoc($result)) , this will loop to the last row in your MySQL Table, thus every time, it will have the last id of your table.

You can code it in a way that your delete script will get the id . So, your delete button for each row will be have the row id , eg process.php?1 , process.php?2 , process.php?3 and so on.

tablepage.php (not sure of your page's real name)

Replace this line:

<td><input type="submit" name="delete" value="Delete"></td>

With this:

<td><p><a href="/process.php?id=<?php echo $id; ?>"></td>

process.php?id=1

// this will get `id=1` and thus your `id` will be `1`, and it will delete row `1`.
$id = $_GET['id'];

$sql = "DELETE FROM playerTeam WHERE id='$id'";

if (mysqli_query($connection, $sql)) {
    echo "Record deleted";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($connection);
}

Hope that helps, thanks!

Answer 3

In actual in this condition ,use ajax and jquery is much more easier i think .But do only by php gonna be use logic code

  $i = 0;
  while($row = mysqli_fetch_assoc($result)) 
     {
     ?>
        <tr>
            <td><input type="text" name="id_<?= $i ?>" value="<?php echo $row['id']?>"></td>
            <td><input type="text" name="fName[]" value="<?php echo $row['firstName']?>"></td>
            <td><input type="text" name="sName[]" value="<?php echo $row['surName']?>"></td>
            <td><input type="text" name="team[]" value="<?php echo $row['team']?>"></td>
            <td><input type="submit" name="delete[<?= $i ?>]" value="Delete"></td>
            <td><input type="submit" name="update[<?= $i ?>]" value="Update"></td>
        </tr>
        <?php
      $i++; //for unique num for each row
    }

process.php

if (isset($_POST['delete'])){
    $delete_id = array_keys($_POST['delete']);//print array key as a array
    $delete_id = $delete_id[0];//so get array key
    $id = $_POST["id_$delete_id"];//get its relative id
    .....
 }