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surinder-insonix / datanucleus-appengine

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Rewrite collection backing store without reusing DataNucleus RDBMS backings #239

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
The DataNucleus RDBMS mappings are based around ordering of operations for 
RDBMS, i.e referential integrity. With GAE/J there are other concerns, namely 
knowing the parent before the child, and preventing re-parenting of objects. 

Also the backing stores in Datastore (RDBMS) support the full range of storage 
(FK, joins, etc including shared FK mappings) and in GAE/J there is currently 
only "FK" support for Sets/Lists/arrays. This means that large parts of the DN 
backing store code is redundant for this use-case.

There are a significant number of problem areas with GAE/J collection wrappers 
- see the issue tracker and forum reports.

Conclusion : rewrite own backing stores suited to what we actually have in 
GAE/J.

Original issue reported on code.google.com by googleco...@yahoo.co.uk on 21 Jul 2011 at 2:09

GoogleCodeExporter commented 8 years ago 
SVN trunk moves away from DN backing stores.

Original comment by googleco...@yahoo.co.uk on 24 Jul 2011 at 6:57