updaing sql table using UPDATE mysql and php syntax - php

Question

i am trying to update my records using UPDATE in php and mysql , the query working but there is not updates at all happened on the database , i have many records for tickets which i need to update there status when the user purchase them , let say the user books 10 tickets i used this syntax
for ($counter = 1; $counter <= $tickets; $counter++) {
echo $eventId;
echo $chooseClass;
echo $chooseUser;
$bookTicket = mysql_query("UPDATE units
SET ticketSold = 'Yes',
userIdFK = '$chooseUser'
WHERE BusinessreservationIdFk = '$eventId'
AND classIDfk ='$choosedClass'"
) or die(mysql_error());
if ($bookTicket)
{
echo "<br/>ticket " . $counter . " done !";
}
else
{
i tried to echo all variables here inside the for loop to make sure this for gets all the variables values , which is working , i have like 1000 tickets already stored on mysql table units which i need to update their status from sold = No to Yes. where is the problem here ?

Answer 1

try building the query separately (e.g. $sql = 'UPDATE ...', so you can do an echo $sql and copy/paste the query and run it manually. Nothing in your code looks wrong, so the values you're passing around must not be correct or the WHERE ... logic isn't proper. So run a sample query manually and see if anything happens then.
However, note that you're doing this inside a for() loop, but aren't using that $counter value anywhere. In effect you're just running the SAME query over and over. Setting ticketSold to Yes $counter times isn't going to make it "more" Yes than if you'd done this update only once.