Re: Thoughts from ADO

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At 03:42 AM 26/11/2010, you wrote:
>  
>
>Hi Anthony,
>
>> The first is DataSet.GetChanges, which produces a dataset which only
>> has changed records. It does a copy, but we could easily do a
>> PurgeCleanRecords. The point being that if a dataset is returned from
>> a remote middle tier, we could purge out any unchanged records for
>> efficiency.
>
>Do you mean if the dataset has to travel on the wire or between several
>JVMs ?

Yes, which I thought was one of your use cases.


>> 
>> The second is AcceptChanges. What this does is explicitly mark a
>> record non-dirty, and copies fields to the optimistic values. It would
>> be called by SessionJDBC after reading or updating records. Might be a
>> slightly cleaner approach to our current handing of dirtyness.
>
>Couldn't you elaborate on this, I don't get the point ?...

Mainly just that our dirtyness is a little dirty at the moment.  SessionJdbc knows too much about the internal state of datasets.  


>While we are on new ideas, I'm missing a feature in current Simpleorm,
>related to data validation.
>Currently we can valide a field, or a record.
>But there is no easy way to validate coherence between different
>records.
>For example I can handle the fact that a field must be a date, or a date
>after 01/01/2000, with SValidator. I can check on the record level that
>the beginning date is before the end date of the record, with
>onValidateRecord(). But I have no way to check that two record won't
>have overlapping periods before committing... (well, no way native to
>Simpleorm).

So maybe an onValidateFlush hook?  Could be on both SRecordMeta and SSession.  SRecordMeta.onValidateFlush called for all dirty records in the order in the update list.  Then SSession.onValidateFlush.  And only then the records are actually flushed so that exceptions will not produce inconsistent state.  

Easy to do, and indeed a gap.

Hibernate etc. do not really do validation in normal usage.  It is all supposed to be just dumb fields in POJOs.  There are ways to listen for events, but they are not really designed for application logic -- you need to reflect into the object being processed.


>I don't really know how this would be possible, or how other frameworks
>address this issue, but it would certainly be interesting to have.
>
>Any comment ?
>
>Regards,
>
>Franck
>
>

Dr Anthony Berglas, [email protected]       Mobile: +61 4 4838 8874
Just because it is possible to push twigs along the ground with ones nose
does not necessarily mean that is the best way to collect firewood.


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