Skeleton related code to ask a question about sequences and

ClienteTable.php

<?php
// Usual Skeleton code...

    public function saveCliente(Cliente $cliente)
    {
        $data = array(
            'nome'      => $cliente->nome,
            'idempresa' => $cliente->idempresa,
        );

        $id = (int) $cliente->idcliente;
        
        if ($id == 0) {
            $sequence = new \Zend\Db\TableGateway\Feature\SequenceFeature('idcliente', 'seq_cliente.nextval');
            $data['idcliente'] = $sequence->nextSequenceId();

            $this->tableGateway->insert($data);
        } else {
            if ($this->find($id)) {
                $this->tableGateway->update($data, array('idcliente' => $id));
            } else {
                throw new \Exception('Cliente não existe');
            }
        }
    }