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delete multiple records

Posted on 2009-03-30
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Last Modified: 2013-12-12
I need to delete multiple records for a database table using a specific id that I receive via URL parameter from the previous page. I found a code similar to this however I am not sure if this would loop to the records as for each specific id I need to delete several records.

I also don't understand "if($_GET['justdel'])". Why do I have to have this again?
<?php
/* delete.php */
$host = "localhost";
$username = "root";
$password = "";
$database = "delsampel";
$connection = mysql_connect($host, $username, $password);
mysql_select_db($database, $connection) or die("MysQL Error");
$id = $_GET[del];
$count = count($id); //counting how many rows to delete
if($_GET['justdel'])
{
for ($i=0; $i<$count; $i++)
{
$sql = mysql_query("delete from tabledelete where id=$id[$i]");
}
if ($sql)
{
print "Record successfully deleted<br>";
print "<a href=view.php>Click here to go back</a>";
}
}
?>

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Question by:michael789
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4 Comments
 
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by:
HMoellendorf earned 1200 total points
ID: 24024816
Hi michael,

thanks for posting at EE. I've seen your question and w'd like to assist you as best as I can.
I understand, that you have an ID in your GET-Variables given from another page, is that correct?

If it is so, you can only use something like my snippet.
It is very important that you will check your id through some functions, i.e. is_integer() or others like that.

The example you gave us supports more than one id in one variable.
You should decide, what you need.

Kind regards,
Henning
<?php
if(isset($_GET["delid"])) {
 //do some verification here
 mysql_query("DELETE FROM table WHERE id = '".$_GET["delid"]."'");
}
?>

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Assisted Solution

by:FirestormX
FirestormX earned 800 total points
ID: 24042097
I don't think that the code posted in the question will work as expected, as line number 9 and 10 of the code won't work; count() counts the number of indexes in an array, and you cannot pass an array through a GET variable.

I'm not sure what knid of data is being sent in the URL data (we'll call it $_GET['id']), but I would think that it would have to be multiple IDs, seperated by commas or spaces.
Assuming commas are used, $_GET['id'] would look like this:
$_GET['id'] = "4,8,15,16,23,42";

You can then use a code like this:
<?php
if (isset($_GET['id']))
{
	$ids = explode(",", $_GET['id']); //Put each ID in an array
	foreach ($ids as $id) //Loop through the array
	{
		if (is_numeric($id))
		{
			mysql_query("DELETE FROM table WHERE id='".mysql_real_escape_string($id)."' LIMIT 1");
		}
	}
}
?>

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by:HMoellendorf
HMoellendorf earned 1200 total points
ID: 24046977
I'm sorry to correct you, FirestormX, but you can pass a array as an GET-Variable.
http://domain.tld/index.php?id[]=1&id[]=2&id[]=3

You will get an array of $_GET["id"];

Kind regards,
Henning
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Assisted Solution

by:FirestormX
FirestormX earned 800 total points
ID: 24048879
Oh, I didn't know that!
I'm sorry to have said that; please disregard that part of my message Michael. (Thanks Henning)

If that's the case then, I assume you could do something like this (I don't know how your form is setup, but I'll create a sample form of how I would do it. Also, keep in mind that there is a limit to how long a URL can be, so using GET variables is limited):
<?php
//Create the form (this will pull all the records in the table, and display them with a checkbox to delete them
 
print '<form method="get" action="delete.php">'
$query = mysql_query("SELECT id, title FROM table") or die(mysql_error());
while ($row = mysql_fetch_array($query))
{
print '<input type="checkbox" name="id[]" value="'.$row['id'].'">'.$row['title'].'</input><br />';
}
print '<input type="submit">';
print '</form>';
 
 
//Now the PHP in delete.php
if (isset($_GET['id']))
{
foreach ($_GET['id'] as $delete_id)
{
if (is_numeric($delete_id))
{
mysql_query("DELETE FROM table WHERE id='".mysql_real_escape_string($delete_id)."' LIMIT 1") or die(mysql_error());
}
}
}
?>

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