I need something like that myself (I get an id from URL and need to
refresh an object and its dependent objects). I am thinking of adding
prefetch functionality to the SingleObjectQuery to allow targeted
relationship refreshing. (BTW, in CVS SingleObjectQuery is renamed to
ObjectIdQuery, as it will allow data row fetches in the next milestone)
Andrus
On Feb 27, 2006, at 1:03 PM, Dave Merrin wrote:
> Hi Andrus,
>
> thanks for that. I had seen that method but was hoping there would
> be a way
> to invalidate all objects without having a reference to them.
>
> This now means I don't need the SingleObjectQuery as I just
> invalidate all
> objects as soon as they've been retrieved from the database.
>
> It's a shame there isn't just a way to turn off caching.
> Alternatively it
> would be good in the mapping file to be able to specify that only
> certain
> objects should be cached. I can do this myself by having a lookup
> list of
> object classes I want cached; that way I will only invalidate certain
> objects. Would just be a cool feature if it was in Cayenne.
>
> Anyway, thanks for the help,
>
> Dave
>
>> -----Original Message-----
>> From: Andrus Adamchik [mailto:andru..bjectstyle.org]
>> Sent: 25 February 2006 05:15
>> To: cayenne-use..bjectstyle.org
>> Subject: Re: SingleObjectQuery & ObjectID
>>
>>
>> For the full object refresh, including relationships, do
>> DataContext.invlidateObjects(..).
>>
>> Andrus
>>
>>
>>
>> On Feb 24, 2006, at 12:33 PM, Dave Merrin wrote:
>>> Hi Andrus,
>>>
>>> cheers for that. I've now run into the problem that my to-many
>>> relationships
>>> (from the newly retrieved object)(and possibly to-one
>>> relationships) are
>>> picking data up from the cache. How can I stop this from happening?
>>>
>>> Cheers,
>>>
>>> Dave
>>>
>>>> -----Original Message-----
>>>> From: Andrus Adamchik [mailto:andru..bjectstyle.org]
>>>> Sent: 23 February 2006 17:11
>>>> To: cayenne-use..bjectstyle.org
>>>> Subject: Re: SingleObjectQuery & ObjectID
>>>>
>>>>
>>>>
>>>> On Feb 23, 2006, at 12:00 PM, Dave Merrin wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I've just come across the caching feature of objectForPK. This is
>>>>> causing me
>>>>> problems so I've had a look at the SingleObjectQuery. This looks
>>>>> much more
>>>>> like what I need.
>>>>
>>>> Yep, that's the way to go if you want to control cache behavior
>>>> manually.
>>>>
>>>>
>>>>> Now I'd like to modify my template to provide a method
>>>>> which creates an ObjectId given a pk value. Something a bit like:
>>>>>
>>>>> createObjectID(int value)
>>>>> {
>>>>> ObjectId result = new ObjectId(this.tablename,
>>>> this.pkColumn, value);
>>>>> return result;
>>>>> }
>>>>>
>>>>> This should be fine but what about the tables that have compound
>>>>> primary
>>>>> keys? Can I create an ObjectId given multiple columns?
>>>>
>>>> Absolutely. Look at other ObjectId constructors - ObjectId can
>>>> take a
>>>> map of values.
>>>>
>>>> Andrus
>>>>
>>>
>>>
>>
>
>
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