Question

I have an UPDATE query I’d like to perform.

But there need to be 2 conditions met before we can update a quantity in the database.

First, the sessions_id() must match one of the sessionid’s in the sessionid column, and second, the Description of the product must match the description of the product corresponding to the sessionid.

Here’s what I have:

mysql_query(UPDATE cart 
               SET quantity = $q, 
             WHERE sessionid = "'.session_id().'" 
               AND description = $d') or die(mysql_error());

Now, it is giving me the following error:

You have an error in your SQL syntax;
check the manual that corresponds to your MySQL server version for the right syntax to use near ‘WHERE sessionid=”bqlbh5rdogbhmq70skhtkbvmb0″ AND description=$d’ at line 1

However, I have copied this update query straight from W3Schools, so it must be correct, right? Any help at all would be appreciated.

Answer 1

It should look that way:

mysql_query("UPDATE cart SET quantity = $q WHERE sessionid='" .session_id(). "' AND description = '$d'") or die(mysql_error());