AlunoTable.php

<?php
namespace Aluno\Model;

use Zend\Db\TableGateway\TableGateway;
use Zend\Db\Adapter\Adapter;
use Zend\Db\ResultSet\ResultSet;

class AlunoTable
{
  protected $tableGateway;

  	public function __construct(TableGateway $tableGateway)
    {
        $this->tableGateway = $tableGateway;
    }
    
	public function fetchAll()
    {
        $resultSet = $this->tableGateway->select();
        return $resultSet;
    }
    
	public function getAluno($matricula)
	{
		$matricula = (int) $matricula;
		$rowset = $this->tableGateway->select(array('matricula' => $matricula));
		$row = $rowset->current();
		if (!$row) {
			throw new \Exception("Não encontrou matrícula $matricula");
		}
		return $row;
	}

	public function saveAluno(Aluno $aluno)
	{
		$data = array(
				'nome' => $aluno->nome,
		);
		$matricula = $aluno->matricula;
		if ($matricula == 0) {
			$this->tableGateway->insert($data);
		} else {
			if ($this->getAluno($matricula)) {
				$this->tableGateway->update($data, array('matricula' => $matricula));
			} else {
				throw new \Exception('A matrícula do aluno não existe');
			}
		}
	}

	public function deleteAluno($matricula)
	{
		$this->tableGateway->delete(array('matricula' => $matricula));
	}

}