Firebird transactions

[u.masotti]

To make updates on firebird database is mandatory a transactional management.

I have Database opened, a datesat connected to that database, and now there are some standard solutions, AFAIK:

1. startTransaction, Edit, change field value, post, committransaction.
2. startTransaction, update query ("UPDATE ... SET ... WHERE ...), committransaction
3. writing code from scratch using ibase* functions

In a JSButtonClick event code, solutions 1. and 2. don't give errors, but simply do nothing!
I searched where code do transaction management... and found in dbtables.inc.php

PHP Code:

class Database extends CustomConnection
{
/* ...some code here... */
        function beginTrans()
        {
            $this->_connection->StartTrans();
        }

        function completeTrans($autocomplete=true)
        {
            return($this->_connection->CompleteTrans($autocomplete));
        }
/* ... some other code here ... */

       $this->_connection = ADONewConnection($this->DriverName); 


So I must investigate what happens in ADOdb.
I've seen videos demonstrating development in mysql, but there's no transactional management.
Any hint?