Question

What is wrong, when you connect to the DB on the LINE BEFORE THE QUERY, and you still get “MySQL server has gone away”?

check this example code:

mysql_connect("localhost", "xxx", "xxx") or die(mysql_error());
mysql_select_db("xxx") or die(mysql_error());
$sql = mysql_query("SELECT id FROM db");
while ($data = mysql_fetch_assoc($sql)) {
$ids[] = $data[id];
}

foreach ($ids as $id) {
$content = file_get_contents("http://www.id.com/?id=$id");
if (stristr($content, "the id is ok man")) {
mysql_connect("localhost", "xxx", "xxx") or die(mysql_error());
mysql_select_db("xxx") or die(mysql_error());
mysql_query("UPDATE db SET status = 'OK' WHERE id = '$id'");
}
}

mysql server is gone away, i get that in the foreach loop.
BTW i need to connect in the foreachloop, because it may take along time before it finds something to update (like 1-2 minutes), and then for sure i will get mysql server has gone away.

Answer 1

I assume your issue is that the script may execute for a very long time before sending the first UPDATE query.

You should check the wait_timeout value in my.cnf. You can check your wait_timeout by running the query “SHOW VARIABLES;”

You can also try to piece of code to do a reconnect:

if (!mysql_ping ($conn)) {
   //here is the major trick, you have to close the connection (even though its not currently working) for it to recreate properly.
   mysql_close($conn);
   $conn = mysql_connect('localhost','user','pass');
   mysql_select_db('db',$conn);
}

Combining with your code it would be:

mysql_connect("localhost", "xxx", "xxx") or die(mysql_error());
mysql_select_db("xxx") or die(mysql_error());
$sql = mysql_query("SELECT id FROM db");
while ($data = mysql_fetch_assoc($sql)) {
    if (!mysql_ping ()) {
       //here is the major trick, you have to close the connection (even though its not currently working) for it to recreate properly.
       mysql_close();
       mysql_connect("localhost", "xxx", "xxx") or die(mysql_error());
       mysql_select_db("xxx") or die(mysql_error());
    }

    $ids[] = $data['id'];
    $content = file_get_contents("http://www.id.com/?id=$id");
    if (stristr($content, "the id is ok man")) {
        mysql_query("UPDATE db SET status = 'OK' WHERE id = '$id'");
    }
}