[GH-136] Support oci8 in TableGenerator

This issue is created automatically through a Github pull request on behalf of dpb587:

Url: https://github.com/doctrine/dbal/pull/136

Message:

Bug fix: yes
Feature addition: no
Backwards compatibility break: no
[](http://travis-ci.org/dpb587/dbal)

This test was breaking when running under `oci8` due to Oracle's deference to upper case column names. I realize Oracle has built-in sequences and `TableGenerator` is unnecessary, in theory, but it seemed like the class should work if possible. I see pgsql is in the same boat.

Tested with:

phpunit -c oci8.phpunit.xml.dist tests/Doctrine/Tests/DBAL/Functional/TableGeneratorTest.php

Before:

PHPUnit 3.5.13 by Sebastian Bergmann.

EE

Time: 0 seconds, Memory: 10.25Mb

There were 2 errors:

1) Doctrine\Tests\DBAL\Functional\TableGeneratorTest::testNextVal
Exception: [Doctrine\DBAL\DBALException] Error occured while generating ID with TableGenerator, aborted generation: Undefined index: sequence_value

2) Doctrine\Tests\DBAL\Functional\TableGeneratorTest::testNextValNotAffectedByOuterTransactions
Exception: [Doctrine\DBAL\DBALException] Error occured while generating ID with TableGenerator, aborted generation: Undefined index: sequence_value

After:

PHPUnit 3.5.13 by Sebastian Bergmann.

..

Time: 1 second, Memory: 10.25Mb

OK (2 tests, 5 assertions)