Custom Doctrine DBAL type 'tinyint' for Symfony

Tinyint.php

<?php

namespace AppBundle\Doctrine\DBAL\Types;

use Doctrine\DBAL\Types\Type;
use Doctrine\DBAL\Platforms\AbstractPlatform;

class Tinyint extends Type
{
    const TINYINT = 'tinyint';

    public function getSQLDeclaration(array $fieldDeclaration, AbstractPlatform $platform)
    {
        $fieldDeclaration = array_merge([
            'length' => 1,
        ], $fieldDeclaration);

        return sprintf("TINYINT(%d)",
                $fieldDeclaration['length']
            );
    }

    public function convertToPHPValue($value, AbstractPlatform $platform)
    {
        return (int) $value;
    }

    public function convertToDatabaseValue($value, AbstractPlatform $platform)
    {
        return (int) $value;
    }

    public function getName()
    {
        return self::TINYINT;
    }

    public function getBindingType()
    {
        return \PDO::PARAM_INT;
    }
}

Which one is right for you?

public function getBindingType()
{
    return ParameterType::INTEGER;
}

OR

public function getBindingType()
{
    return \PDO::PARAM_INT;
}

@muratcakmaksoftware probably using Doctrine\DBAL\ParameterType would be better option here.
I'm sorry I haven't been working with Symfony or Doctrine for ages now.