Error in my code - please help!

[beowulf8]

I am almost sure that the error is here:

$pedido_query = $db->Execute("select orders_id from " . TABLE_ORDERS . " order by orders_id desc limit 0,1");
$res_pedido = $db->Execute($pedido_query); 

Please help!!

[DrByte]

$pedido_query = $db->Execute("select orders_id from " . TABLE_ORDERS . " order by orders_id desc limit 0,1");
$res_pedido = $db->Execute($pedido_query); 

Why are you doing $db->Execute on the actual query directly, and then doing $db->Execute again on the query results immediately afterward?