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Re: [Bug 11257] New: Should IDBCursor.update be able to create a new entry?

From: Jonas Sicking <jonas@sicking.cc>
Date: Thu, 11 Nov 2010 09:46:33 -0800
Message-ID: <AANLkTi=yMuBv==681rbH3QU2ePjh20kYtEVksVB7iB_M@mail.gmail.com>
To: Jeremy Orlow <jorlow@chromium.org>
Cc: public-webapps@w3.org
On Thu, Nov 11, 2010 at 5:11 AM, Jeremy Orlow <jorlow@chromium.org> wrote:
> On Mon, Nov 8, 2010 at 2:12 PM, <bugzilla@jessica.w3.org> wrote:
>>
>> http://www.w3.org/Bugs/Public/show_bug.cgi?id=11257
>>
>>           Summary: Should IDBCursor.update be able to create a new entry?
>>           Product: WebAppsWG
>>           Version: unspecified
>>          Platform: PC
>>        OS/Version: All
>>            Status: NEW
>>          Severity: normal
>>          Priority: P2
>>         Component: Indexed Database API
>>        AssignedTo: dave.null@w3.org
>>        ReportedBy: jonas@sicking.cc
>>         QAContact: member-webapi-cvs@w3.org
>>                CC: mike@w3.org, public-webapps@w3.org
>>
>>
>> What should happen in the following case:
>>
>> db.transaction(["foo"]).objectStore("foo").openCursor().onsuccess =
>> function(e)
>> {
>>  var cursor = e.result;
>>  if (!cursor)
>>    return;
>>
>>  cursor.delete();
>>  cursor.update({ id: 1234, value: "Benny" });
>> }
>>
>>
>> This situation can of course arrive in more subtle ways:
>>
>> os = db.transaction(["foo"]).objectStore("foo");
>> os.openCursor().onsuccess = function(e) {
>>  var cursor = e.result;
>>  if (!cursor)
>>    return;
>>
>>  cursor.update({ id: 1234, value: "Benny" });
>> }
>> os.delete(1234);
>>
>>
>> As specified, IDBCursor.update behaves just like IDBObjectStore.put and
>> just
>> creates a new entry, but this might be somewhat unexpected behavior.
>
> Let's just remove update and delete from IDBCursor and be done with it.

The problem is that you can't always get to the key of the objectStore
entry to delete/update. Specifically if the objectStore uses
out-of-line keys the cursor doesn't expose those.

Also, I think that if we simply implement .update and .delete as calls
to .put and .delete on the object store, the implementation burden is
minimal.

/ Jonas
Received on Thursday, 11 November 2010 17:47:28 GMT

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