Question

In Android SQLite I had one table MyTable. By mistake I dropped it after upgrade the DB.

How can I ROLL BACK that dropped table if it’s possible.

Any good answer will be accepted.

Thanks.

Answer 1

Dropping tables is not a recoverable action, unless performed as part of a transaction that is rolled back (which appears to be not the scenario for your particular case).

From the SQLite documentation:

The DROP TABLE statement removes a table added with the CREATE TABLE statement. The name specified is the table name.

The dropped table is completely removed from the database schema and the disk file. The table can not be recovered. All indices and triggers associated with the table are also deleted.

That’s not quite the complete picture, as the behaviour under rolled-back transaction can be seen with (tested on https://sqliteonline.com/):

drop table if exists paxtable;
create table paxtable (paxcolumn integer);
insert into paxtable values (42);
begin transaction;
drop table paxtable;
rollback;
select paxcolumn from paxtable;

That shows that the table still exists after the rollback. If you commit rather than roll back (or if you remove the transactional control altogether), the table has died, expired, gone to meet its maker, shuffled off this mortal coil, <insert your favourite metaphor here>.

So, since you didn’t do it as part of a rolled-back transaction (as evidenced by the fact the table has actually gone), you’ll need to re-create it from scratch (or from backups if possible).