Cannot update row in mysql using PHP
Question
here is the index.php
<body>
<?php require_once 'process.php';?>
<?php
if (isset($_SESSION['message'])):?>
<div class="alert alert-<?$_SESSION['msg_type']?>">
<?php
echo $_SESSION['message'];
unset($_SESSION['message']);
?>
</div>
<?php endif ?>
<div class = "container">
<?php
$result=mysqli_query($conn,"SELECT * FROM book ");
?>
<div class= "row justify-content-center">
<table class="table">
<thead>
<tr>
<th>Title</th>
<th>Author</th>
<th>Year</th>
<th>Donor's Name</th>
<th>Call Number</th>
<th>Date Received</th>
<th>Handled By</th>
<th colspan="2">Action</th>
</tr>
</thead>
<?php
while ($row = mysqli_fetch_assoc($result)){
?>
<tr>
<td><?php echo $row['title'];?></td>
<td><?php echo $row['author'];?></td>
<td><?php echo $row['year'];?></td>
<td><?php echo $row['donorname'];?></td>
<td><?php echo $row['callnum'];?></td>
<td><?php echo $row['datereceived'];?></td>
<td><?php echo $row['handledby'];?></td>
<td>
<a href="index.php?edit=<?php echo $row["id"];?>" class="btn btn-info">Update</a>
</td>
<td>
<a href="process.php?delete=<?php echo $row["id"];?>" class="btn btn-danger">Delete</a>
</td>
</tr>
<?php } ?>
</table>
</div>
<?php
function pre_r($array){
echo '<prev>';
print_r($array);
echo '</prev>';
}
?>
<form action="process.php" method ="POST">
<input type="hidden" name="id" value="<?php echo $id;?>">
<div class="form-group">
<label>Title</label>
<input type ="text" name="title" value="<?php echo $title;?>">
</div>
<div class="form-group">
<label>Author</label>
<input type ="text" name="author" value="<?php echo $author;?>">
</div>
<div class="form-group">
<label>Year</label>
<input type ="text" name="year" value="<?php echo $year;?>">
</div>
<div class="form-group">
<label>Donor's Name</label>
<input type ="text" name="donorname" value="<?php echo $donorname;?>">
</div>
<div class="form-group">
<label>Call Number</label>
<input type ="text" name="callnum" value="<?php echo $callnum;?>">
</div>
<div class="form-group">
<label>Date Received</label>
<input type ="Date" name="datereceived" value="<?php echo $datereceived;?>">
</div>
<div class="form-group">
<label>Handled By</label>
<input type ="text" name="handledby" value="<?php echo $handledby;?>">
</div>
<div class="form-group">
<?php
if ($update ==true):
?>
<button type="submit" name="update" class="btn btn-primary">Update</button>
<?php else: ?>
<button type="submit" name="save" class="btn btn-primary">save</button>
<?php endif; ?>
</div>
</form>
process.php page
<?php
session_start();
$conn = mysqli_connect('localhost','root','');
if(!$conn)
{
die('Could not connect : ' . mysqli_error());
}
mysqli_select_db($conn,"admin");
$id =0;
$update = false;
$title='';
$author='';
$year='';
$donorname='';
$callnum='';
$datereceived='';
$handledby='';
if (isset($_POST['update'])){
$id = $_POST['id'];
$title = $_POST['title'];
$author=$_POST['author'];
$year = $_POST['year'];
$donorname=$_POST['donorname'];
$callnum = $_POST['callnum'];
$datereceived=$_POST['datereceived'];
$handledby = $_POST['handledby'];
$update=mysqli_query($conn,"UPDATE book SET `title`='$title', author ='$author', year='$year', donorname='$donorname', callnum='$callnum', datereceived='$datereceived' , handledby='$handledby' WHERE `id`='$_POST[id]'");
$_SESSION['message'] ="Record has been updated!";
$_SESSION['msg_type'] ="warning";
header("location:index.php");
}
?>
The problem is now, I can only update the last row. I want to update each row that I selected but only the last row can be updated.I couldn't figure out which part did I do wrong. It seems like the id is not pass, however on the url when I click on the update button, the id is already passed. I already tried this code using different database, and it seems to work just fine.
1 answers
solution1
-2 2019-10-25 08:34:09
First you need to get the right 'id' of the selected row, based on your code you are using a link to determine the selected 'id' from the "edit=<?php echo $row["id"];?>" . Now what you need to do is get the id from the link:
if(isset($_GET['edit'])) $selected_id=$_GET['edit'];
else $selected_id=0;
Then set the value of the hidden input:
<input type="hidden" name="id" value="<?php echo $selected_id;?>">
And in your update query change this WHERE id='$_POST[id]' to WHERE id=$id
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