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It's only reasonable to have proper type hinting here which might even help us to catch bugs.

Otherwise the function is executed n times which is a lot of overhead

Remove \OC\DB\ConnectionWrapper, have \OC\DB\Connection implement \OCP\IDBConnection directly instead

Let's document this potential pitfall properly.

- re-enable encryption migration tests
- sqlite requires reconnect after schema changes

Set default collation of mysql connection to utf8_bin
Set utf_bin as default collation for new tables

Modified insertIfNotExist() to support NULL values

Fix #9161

When the migrator renames a table, for example for upgrade simulation,
it should not rename the primary key to avoid messing up with the diff
because the MySQL Doctrine code expects that index to always be called
"primary".

adding auto increment/PK to table files_trash

adding PK to table ldap_user_mapping and ldap_group_members

adding PK to table ldap_group_mapping

truncate permissions table to allow smooth creation of primary key

adding unit test for creating an auto increment column on a table which already contains data

remove unneeded table files_trashsizes

fix unit test

no need to truncate *PREFIX*permissions

On Oracle adding auto increment columns is not working out of the box - Oracle migrations are to be done manually

When upgrade, also simulate the database schema update for apps before
doing the actual upgrade.