Android uses SQLite, so your questions are really about how SQLite behaves. On their web site, a relevant part might be:
http://www.sqlite.org/faq.html#q19 On Tue, May 11, 2010 at 11:45 AM, Tomei Ningen <tomei.nin...@yahoo.com>wrote: > Hello, > > I have an app that stores a database on SD card. > > If I don't use beginTransaction/endTransaction, does Android have any > guarantee about the the contents of a database when power is lost? For > example, if I have code like this: > > //db.beginTransaction(); > //try { > db.delete(TABLE_NAME, "id=123", null); > System.out.println("Deleted 123"); > > db.delete(TABLE_NAME, "id=456", null); > System.out.println("Deleted 456"); > > // db.setTransactionSuccessful(); > //} finally { > // db.endTransaction(); > //} > > and the database is in SD card. > > When I randomly pull the SD card from the phone, is any of the > following guaranteed to be true if I insert the SD card again and > reload the database: > > (1) Order of deletion -- if id=456 has been deleted, then id=123 must > have been deleted. > > (2) Immediacy of commit -- if I see the message "Deleted 123" from > logcat, then id=123 must have been deleted. > > (3) Non corruption -- rows that are unrelated to id=123 and id=456 are > guaranteed to remain in the database regardless > > Note that I am not using transactions because I don't need the two > rows to be atomically deleted. However, I do not want the user has any > surprises -- if I tell them a row has been deleted, then this row > should not appear again when the user re-inserts the SD card. > > Thanks! > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to android-developers@googlegroups.com > To unsubscribe from this group, send email to > android-developers+unsubscr...@googlegroups.com<android-developers%2bunsubscr...@googlegroups.com> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
