Remove OC_DB::getConnection

core/command/db/converttype.php

core/command/db/generatechangescript.php

lib/private/db.php

lib/private/files/cache/storage.php

lib/private/repair.php

lib/private/repair/innodb.php

lib/private/repair/searchlucenetables.php

lib/private/server.php

lib/private/share/share.php

lib/private/tags.php

tests/lib/app.php

tests/lib/db/mdb2schemamanager.php

tests/lib/db/migrator.php

tests/lib/db/mysqlmigration.php

tests/lib/db/sqlitemigration.php

tests/lib/dbschema.php

tests/lib/repair/repaircollation.php

tests/lib/repair/repairinnodb.php

tests/lib/repair/repairsqliteautoincrement.php

tests/lib/tags.php