SQL not working unless multiple db_connect(); statements

In the past I've had no issues using one simple: $link = db_connect(); in a single file with multiple SQL commands like so: $sql = "UPDATE table SET..."; $sql_result = mysql_query($sql, $link) or die("Couldn't execute query."); $sql2 = "UPDATE table2 SET..."; $sql_result2 = mysql_query($sql2, $link) or die("Couldn't execute query."); Now any new file I create won't work without multiple/