public function __construct(kxDB &$connection, $name = NULL)
{
$this->connection =& $connection;
// If there is no transaction depth, then no transaction has started. Name
// the transaction 'drupal_transaction'.
if (!($depth = $connection->transactionDepth())) {
$this->name = 'drupal_transaction';
} elseif (!$name) {
$this->name = 'savepoint_' . $depth;
} else {
$this->name = $name;
}
$this->connection->pushTransaction($this->name);
}