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From Aristedes Maniatis <...@maniatis.org>
Subject Re: Order of operations?
Date Fri, 01 Jul 2016 03:04:55 GMT
On 1/07/2016 11:01am, Andrus Adamchik wrote:
> So there are tradeoffs and challenges and this won't be an easy task. But if anyone feels
like applying their graph theory knowledge to a non-trivial problem, please speak up :)

Although I don't have a solution, I have three observations/questions:

1. The Cayenne model will need to have additional metadata about database indexes and constraints.
I've always liked that idea anyway but lacked the time to work on it personally. It could
open up interesting interactions with projects like liquibase [1]

2. Has Hibernate or any other ORM solved this problem in an interesting way? [2] Hibernate
appears to split "collection deletes/inserts" which I presume means "to-many" joined records.

3. Keeping the order that changes are added to the context is another simple approach that
leaves it up to the developer to get it right in code. It doesn't quite tell us what to do
with two updates to the same object that are collapsed into one, but otherwise it seems sensible
as an option.


[1] https://github.com/liquibase/liquibase-hibernate for a simplistic approach, but we could
go much further.

[2] http://stackoverflow.com/questions/12616336/how-is-hibernate-deciding-order-of-update-insert-delete

-- 
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Aristedes Maniatis
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