## BC BREAK: the PDO symbols are no longer part of the DBAL API
1. The support of `PDO::PARAM_*`, `PDO::FETCH_*`, `PDO::CASE_*` and `PDO::PARAM_INPUT_OUTPUT` constants in the DBAL API is removed.
2.`\Doctrine\DBAL\Driver\PDOStatement` does not extend `\PDOStatement` anymore.
Before:
use Doctrine\DBAL\Portability\Connection;
$params = array(
'wrapperClass' => Connection::class,
'fetch_case' => PDO::CASE_LOWER,
);
$stmt->bindValue(1, 1, PDO::PARAM_INT);
$stmt->fetchAll(PDO::FETCH_COLUMN);
After:
use Doctrine\DBAL\ColumnCase;
use Doctrine\DBAL\FetchMode;
use Doctrine\DBAL\ParameterType;
use Doctrine\DBAL\Portability\Connection;
$params = array(
'wrapperClass' => Connection::class,
'fetch_case' => ColumnCase::LOWER,
);
$stmt->bindValue(1, 1, ParameterType::INTEGER);
$stmt->fetchAll(FetchMode::COLUMN);
## BC BREAK: Removed dbal:import CLI command
The `dbal:import` CLI command has been removed since it only worked with PDO-based drivers by relying on a non-documented behavior of the extension, and it was impossible to make it work with other drivers.
