Question

I’m tying to update a certain number of records , in my code here $tickets = 10 which means i need to update 10 records only in the database accroding to mysql criteria , my for loop here update all the records (100 record at once !) for my criteria , here is my code

for ($counter = 1; $counter <= $tickets; $counter++) {

    $bookTicket = mysql_query("UPDATE units SET 
    ticketSold = 'No',
    userIdFK = '$chooseUser' 
    WHERE BusinessreservationIdFk = '$eventId' 
          AND classIDfk ='$chooseClass' ")
    or die(mysql_error());

    if ($bookTicket) 
    {
         echo "<br/>ticket " . $counter . "  done !";
    } 
    else 
    {
         echo "no<br/>";
    }                                                            
}

How can I achieve to update one record each time the for counts ?

Answer 1

You can use LIMIT in your code so your code woulde be

for ($counter = 1; $counter <= $tickets; $counter++) {

    $bookTicket = mysql_query("UPDATE units SET 
    ticketSold = 'No',
    userIdFK = '$chooseUser' 
    WHERE BusinessreservationIdFk = '$eventId' 
          AND classIDfk ='$chooseClass' LIMIT 1") //ADD LIMIT TO THIS LINE
    or die(mysql_error());

    if ($bookTicket) 
    {
         echo "<br/>ticket " . $counter . "  done !";
    } 
    else 
    {
         echo "no<br/>";
    }                                                            
}

But I think you should use this instead so you use only 1 query at one time.

$bookTicket = mysql_query("UPDATE units SET 
ticketSold = 'No',
userIdFK = '$chooseUser' 
WHERE BusinessreservationIdFk = '$eventId' 
      AND classIDfk ='$chooseClass' LIMIT 10")

PS. I think your code would be risk to SQL injection security problem. Please look about it too.