This constant is not recognized by PHPStan, and besides the docs say
this:

> Prior to PHP 5.3.2 (PECL OCI8 1.4) use OCI_DEFAULT which is equivalent
to OCI_NO_AUTO_COMMIT.

See https://www.php.net/manual/en/function.oci-execute.php

That method is already defined in the parent interface.

This was shown as an error by Psalm but should not be considered one
IMO. See https://github.com/vimeo/psalm/pull/3203

null contradicts the phpdoc

Additionally, set the new value and get the old one in one ini_set() call.

By either defining their types or renaming to match parent class (or
interface).

This will allow to omit parameters with unspecified types

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

also simplifies the code and now exactly matches postgresql search rules