new to mysql question php - php

Question

I have a table in my database that looks like this:
|id|team_name|team_url|xml|
I have a cronjob that calls a script. In this script, I want to use my class to check if the url exists, and if it doesn't, delete the entry in the database. Something like this:
foreach row in table, if (Security::checkUrl(team_url)), delete entry. else: update xml.
How can I do something like this? I don't need help with the url verification only the mysql query and how i should go through each row and delete the rows where the url is invalid.
Thanks.

Answer 1

The mysql query to delete the row would be
DELETE FROM tablename WHERE team_url = '$team_url';
$team_url is the php variable which has the team_url value.
The above command will delete all rows where the team_url matches $team_url.
What you will want to do is in php loop through all the rows and check their URL.
$query = "SELECT * FROM tablename";
// Perform Query
$result = mysql_query($query);
// Check result
// This shows the actual query sent to MySQL, and the error. Useful for debugging.
if (!$result) {
$message = 'Invalid query: ' . mysql_error() . "\n";
$message .= 'Whole query: ' . $query;
die($message);
}
// Use result
// Attempting to print $result won't allow access to information in the resource
// One of the mysql result functions must be used
// See also mysql_result(), mysql_fetch_array(), mysql_fetch_row(), etc.
while ($row = mysql_fetch_assoc($result)) {
if (Security::checkUrl($row['team_url'])) {
$res = mysql_query("DELETE FROM tablename WHERE team_url = '".mysql_real_escape_string($row['team_url'])."'");
}
else {
//update xml
}
}
mysql_free_result($result);
The above code is just a sample and not to be used in production without proper sql injection cleaning / checking.

Answer 2

To delete a row with a given URL, prepare a query like 'DELETE FROM table WHERE team_url=?' with, e.g.,
mysqli_stmt::prepare(). Then bind the URL that you want to delete to the parameter with mysqli_stmt::bind_param(), à la bind_param("s", $dead_url). Then execute the statement using mysqli_stmt::execute().
EDIT: per strager's suggestion: the mysqli reference in the PHP manual is here: http://php.net/manual/en/book.mysqli.php. It has links to documentation for all the functions that I just mentioned.