[news.eclipse.technology.cosmos] Re: How to avoid the empty templates lo

[David Whiteman <david_whiteman@xxxxxxxxxx>]

arunachalam wrote:
> Hi ,
>      I successfully used the cosmos API and get the output , But for my 
> project the requirement is that I should not load all the items from the 
> db because the db may have the miilions of records. But on the query 
> there can be a empty template [ please see the example query below ] and 
> that empty template can be as a source or target into the relaitonship 
> template.
>
>     But when I have a empty template as per the cosmos API it loads all 
> the items logically , But If I don't have the ItemTemplateHandler and 
> having the empty item template in the query I am getting the exception 
> as "Unsupported Constraint Type" exception.
>
>     I don't want to load the all the items from the db , but want to 
> load only the items that is having the relationship with the source or 
> target. In my example I am having the empty template as a source , So I 
> can pass the source as null to the DB and get the items having a RUNSON 
> relaitonship with the target template items and want to add these items 
> into the query response.
> I added the empty item on my ItemTemplateHandler and again create the 
> item handler in my relationshiprecordtypehanlder to add the source items 
> which I got after I apply the relationship record type , But I am not 
> getting the source items in my query response and still getting the 
> empty item element on the query response.
>
>
>     Is there a way in the cosmos API for doing this or I need to write 
> my own code to do this ? If I need to write my own code which part of 
> the code needs to be changed or Can I extend any of the class and write 
> my code to do this?
>
> Regards
>
> Arunachalam

Hi Arunachalam,

My apologies for the long delay in responding.  Thank you for your 
detailed post.

You can look at the Aperi MDR example as an example of overriding the 
handler processing to gain more control in the process.

For the exception, I have created a defect in our system: 
https://bugs.eclipse.org/bugs/show_bug.cgi?id=264556 .  Please add 
yourself to the cc: list to be notified of its progress, and provide any 
additional info there as necessary.

Also, for the case you describe immediately after that, does it also 
seem to be working improperly?  If so, please create a defect for that 
as well.  And if you have any specific API requests, feel free to create 
an enhancement request in Bugzilla so we can prioritize the effort.

Regards,
David