Catch a unique constraint violated error using Adodb?

[jtp51]

Details:
Adodb
PHP 5.0.2

Question:

How could I approach catching a unique constraint violated error using Adodb?

Summary:

I believe that the real error lies within the adodb-oci8.inc.php file itself, in which the following code is ran:

if (OCIExecute($stmt,$this->_commit)) {

As you can tell, even when you create your object and run the execute method it would still not catch a unique constraint error.

try {
	$db = NewADOConnection("oci8");
	$db->Connect('','scott','bad-password');
	$db->execute('INSERT INTO TABLE (type, id) VALUES ('B', 12)');
} catch (exception $e) {
	var_dump($e);
}

Would I need to run a seperate query to check value of the primary key first?

Any ideas or suggestions would be greatly appreciated.

Thank you.