Fix MigrateBackgroundImages on oracle

[juliusknorr]

Summary

server/apps/theming/lib/Jobs/MigrateBackgroundImages.php

Line 95 in 09099cf

->andWhere($selector->expr()->eq('configvalue', $selector->createNamedParameter('custom')))

fails on oracle as configvalue is a longtext which is not allowed in where clauses without casting.

This is the same approach also used in

server/lib/private/AllConfig.php

Lines 497 to 499 in 361e69f

	->andWhere($qb->expr()->eq(
	$qb->expr()->castColumn('configvalue', IQueryBuilder::PARAM_STR),
	$qb->createNamedParameter($value, IQueryBuilder::PARAM_STR))

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[juliusknorr]

/backport to stable25

[juliusknorr]

Pushed another commit to test if passing PARAM_STR to the eq function also works, as this should cast also looking at the implementation of the OCIExpressionBuilder

[nickvergessen]

Pushed another commit to test if passing PARAM_STR to the eq function also works, as this should cast also looking at the implementation of the OCIExpressionBuilder

Should adjust the runtime code now as well?

[juliusknorr]

Failures unrelated.

[juliusknorr]

/backport ecccff8 to stable25

[backportbot-nextcloud]

The backport to stable25 failed. Please do this backport manually.