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Re: [IndexedDB] Need a method to remove a database

From: Jeremy Orlow <jorlow@chromium.org>
Date: Thu, 5 Aug 2010 10:30:28 +0100
Message-ID: <AANLkTik2O1MAuUZEXJdWQmF3ZFWJ==BaxAPRJA+_9m+y@mail.gmail.com>
To: Jonas Sicking <jonas@sicking.cc>
Cc: Shawn Wilsher <sdwilsh@mozilla.com>, public-webapps WG <public-webapps@w3.org>
On Wed, Aug 4, 2010 at 7:15 PM, Jonas Sicking <jonas@sicking.cc> wrote:

> On Wed, Aug 4, 2010 at 2:56 AM, Jeremy Orlow <jorlow@chromium.org> wrote:
> > On Tue, Aug 3, 2010 at 11:26 PM, Jonas Sicking <jonas@sicking.cc> wrote:
> >>
> >> On Tue, Aug 3, 2010 at 3:20 PM, Shawn Wilsher <sdwilsh@mozilla.com>
> wrote:
> >> > Hey all,
> >> >
> >> > Some of the feedback I've been seeing on the web is that there is no
> way
> >> > to
> >> > remove a database.  Examples seem to be "web page wants to allow the
> >> > user to
> >> > remove the data they stored".  A site can almost accomplish this now
> by
> >> > removing all object stores, but we still end up storing some meta data
> >> > (version number).  Does this seem like a legit request to everyone?
> >>
> >> Sounds legit to me. Feel somewhat embarrassed that I've missed this so
> far
> >> :)
> >
> > Agreed.
> > What should the semantics be for open database connections?  We could do
> > something like setVersion, but I'd just as soon nuke any existing
> connection
> > (i.e. make all future operations fail).  This seems reasonable since the
> > reasons we didn't do this for setVersion (data loss) don't really seem to
> > apply here.
>
> Actually, there could dataloss apply here. Consider a page which
> creates a temporary database, fills it with data, and then slowly
> sends it to the server. Once all data has been sent to the server the
> database is removed.
>
> If you have two instances of that page open, one could remove the
> database while the other is still writing to it.
>
> Though this seems like a pretty scary setup anyway since if the user
> closes the second page midway through, the first one will succeed in
> deleting the database no matter what.


Well, presumably the site won't delete a database programmatically if it
still has important information in it.  I mean, the same scenario you just
explained could happen with .clear() or .removeObjectStore() as well.

J
Received on Thursday, 5 August 2010 09:31:20 GMT

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