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From <do...@xsinet.co.za>
Subject Re: Inheritance Question
Date Fri, 20 Dec 2013 07:49:43 GMT
Thanks for asking Andrus:

Because ClassTwo contains a BLOB that I don't want retrieved when asking for 
ClassOne objects.

Jurgen


-----Original Message----- 
From: Andrus Adamchik
Sent: Friday, December 20, 2013 8:58 AM
To: user@cayenne.apache.org
Subject: Re: Inheritance Question

No.

But a question though - if the result set only contains ClassOne rows, why 
would you care about inclusion of all those extra columns in the SELECT?

Andrus

On Dec 20, 2013, at 9:50 AM, dollj@xsinet.co.za wrote:

> Thanks for your reply Andrus.
>
> I don't suppose that there is a way to tell Cayenne not to be so eager in 
> this case ?
>
> Jurgen
>
>
> -----Original Message----- From: Andrus Adamchik
> Sent: Friday, December 20, 2013 8:27 AM
> To: user@cayenne.apache.org
> Subject: Re: Inheritance Question
>
> From what I can tell, this is the intended behavior. If your SelectQuery 
> root is ClassOne, Cayenne expects that the result might contain a mix of 
> ClassOne and any of its subclasses (which means ClassTwo as well). So the 
> columns in SELECT are a superset of columns for all the classes involved.
>
> Andrus
>
>
> On Dec 12, 2013, at 12:30 PM, dollj@xsinet.co.za wrote:
>> Hi All
>>
>> I have a dbEntity say ClassOne (its lightweight) and another that 
>> inherits from it as ClassTwo (its heavyweight).
>>
>> Now in my case I have a prefetch that retrieves ClassOne objects.
>>
>> The problem that I have is that Cayenne is fetching ClassTwo data as well 
>> ?!
>>
>> Surely Cayenne should only be fetching the ClassOne data, why is ClassTwo 
>> data also being retrieved ?
>>
>> Is this the intended behaviour ?   Is there a way to prevent it ?
>>
>> Thanks, Jurgen
>>
>>
>>
>
>


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