I want to delete multiple rows from MYSQL database. I have created this delete.php file to select various links and delete them using checkboxes.
<html>
<head>
<title>Links Page</title>
</head>
<body>
<h2>Choose and delete selected links.</h2>
<?php
$dbc = mysqli_connect('localhost','root','admin','sample')
or die('Error connecting to MySQL server');
$query = "select * from links ORDER BY link_id";
$result = mysqli_query($dbc,$query)
or die('Error querying database');
$count=mysqli_num_rows($result);
?>
<table width="400" border="0" cellspacing="1" cellpadding="0">
<tr>
<td><form name="form1" method="post" action="">
<table width="400" border="0" cellpadding="3" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<td bgcolor="#FFFFFF"> </td>
<td colspan="3" bgcolor="#FFFFFF"><strong>Delete multiple links</strong> </td>
</tr>
<tr>
<td align="center" bgcolor="#FFFFFF">#</td>
<td align="center" bgcolor="#FFFFFF"><strong>Link ID</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Link Name</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Link URL</strong></td>
</tr>
<?php
while ($row=mysqli_fetch_array($result)) {
?>
<tr>
<td align="center" bgcolor="#FFFFFF"><input name="checkbox" type="checkbox" value="<?php echo $row['link_id']; ?>"></td>
<td bgcolor="#FFFFFF"><?php echo $row['link_id']; ?></td>
<td bgcolor="#FFFFFF"><?php echo $row['link_name']; ?></td>
<td bgcolor="#FFFFFF"><?php echo $row['link_url']; ?></td>
</tr>
<?php
}
?>
<tr>
<td colspan="4" align="center" bgcolor="#FFFFFF"><input name="delete" type="submit" value="Delete"></td>
</tr>
<table width="400" border="0" cellspacing="1" cellpadding="0">
<tr>
<td><form name="form1" method="post" action="">
<table width="400" border="0" cellpadding="3" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<td bgcolor="#FFFFFF"> </td>
<td colspan="3" bgcolor="#FFFFFF"><strong>Delete multiple links</strong> </td>
</tr>
<tr>
<td align="center" bgcolor="#FFFFFF">#</td>
<td align="center" bgcolor="#FFFFFF"><strong>Link ID</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Link Name</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Link URL</strong></td>
</tr>
<?php
while ($row=mysqli_fetch_array($result)) {
?>
<tr>
<td align="center" bgcolor="#FFFFFF"><input name="checkbox" type="checkbox" value="<?php echo $row['link_id']; ?>"></td>
<td bgcolor="#FFFFFF"><?php echo $row['link_id']; ?></td>
<td bgcolor="#FFFFFF"><?php echo $row['link_name']; ?></td>
<td bgcolor="#FFFFFF"><?php echo $row['link_url']; ?></td>
</tr>
<?php
}
?>
<tr>
<td colspan="4" align="center" bgcolor="#FFFFFF"><input name="delete" type="submit" value="Delete"></td>
</tr>
<?php
// Check if delete button active, start this
if(isset($_POST['delete']))
{
$checkbox = $_POST['checkbox'];
for($i=0;$i<count($checkbox);$i++){
$del_id = $checkbox[$i];
$sql = "DELETE FROM links WHERE link_id='$del_id'";
$result = mysqli_query($sql);
}
// if successful redirect to delete_multiple.php
if($result){
echo "<meta http-equiv=\"refresh\" content=\"0;URL=view_links.php\">";
}
}
mysqli_close($dbc);
?>
</table>
</form>
</td>
</tr>
</table>
</body>
</html>
This doesn't seem to delete any row. My data is populated in the table. I guess the problem is with the PHP code. Please help me out here.
$deleted = $_POST['checkbox'];
$sql = "DELETE FROM $tbl_name WHERE id IN (".implode(",", $deleted ) . ")";
Something that sometimes crops up you may/maynot be aware of
Won't always be picked up by by $_POST['delete'] when using IE. Firefox and chrome should work fine though. I use a seperate isntead which solves the problem for IE
As for your not deleting in your code above you appear to be echoing out 2x sets of check boxes both pulling the same data? Is this just a copy + paste mistake or is this actually how your code is?
If its how your code is that'll be the problem as the user could be ticking one checkbox array item but the other one will be unchecked so the php code for delete is getting confused. Either rename the 2nd check box or delete that block of html surely you don't need to display the same list twice ?
Delete Multiple checkbox using PHP Code
<input type="checkbox" name="chkbox[] value=".$row[0]."/>
<input type="submit" name="delete" value="delete"/>
<?php
if(isset($_POST['delete']))
{
$cnt=array();
$cnt=count($_POST['chkbox']);
for($i=0;$i<$cnt;$i++)
{
$del_id=$_POST['chkbox'][$i];
$query="delete from $tablename where Id=".$del_id;
mysql_query($query);
}
}
Use array notation like name="checkbox[]" in your input element. This will give you $_POST['checkbox'] as array. In the query you can utilize it as
$sql = "DELETE FROM links WHERE link_id in ";
$sql.= "('".implode("','",array_values($_POST['checkbox']))."')";
Thats one single query to delete them all.
Note: You need to escape the values passed in $_POST['checkbox'] with mysql_real_escape_string or similar to prevent SQL Injection.
<?php $sql = "SELECT * FROM guest_book";
$res = mysql_query($sql);
if (mysql_num_rows($res)) {
$query = mysql_query("SELECT * FROM guest_book ORDER BY id");
$i=1;
while($row = mysql_fetch_assoc($query)){
?>
<input type="checkbox" name="checkboxstatus[<?php echo $i; ?>]" value="<?php echo $row['id']; ?>" />
<?php $i++; }} ?>
<input type="submit" value="Delete" name="Delete" />
if($_REQUEST['Delete'] != '')
{
if(!empty($_REQUEST['checkboxstatus'])) {
$checked_values = $_REQUEST['checkboxstatus'];
foreach($checked_values as $val) {
$sqldel = "DELETE from guest_book WHERE id = '$val'";
mysql_query($sqldel);
}
}
}
Source: Stackoverflow.com