Savepoint

Hi Anthony,

I couldn't help but commit a new feature whose intent is to allow to
recover a dataset after a rollback, without the cost of the clone()
solution.

If not used, the feature has no impact on the way simpleorm works, so I
thought it was quite harmful...

I called it savepoint, and the usage is:

ses.begin(ds.savepoint());

then, if 'ds.hasSavepoint()', you can:

ses.rollbackAndDetachDataset();

The tradeoff is that ds.savepoint() is quite costly, especially for big
dataSets... (but should be less costly than clone()).

Of course, comments are welcome !

Franck





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