Entity Versioning Issues

googol4u

Hi,

I have another question about the entity version.  When the entity is evolved, the version of the entity should be increased so that the engine will try to convert its data.  Under some circumstances, if we want to switch the program to a previous version, an incompatible exception will raise.  What should I do to convert the data back to previous version?

Another scenario.  If two programs are visiting the same database and one of the program get evolved while the other program is running( the database is opened), what will happen for both of the programs?

Greybird-Oracle

The DPL (com.sleepycat.persist) package does not support evolving to an earlier version.  So you simply can't do this and therefore you should avoid reverting your application to an earlier version.  You could implement a way of reverting the data to an earlier format yourself, but this would be a complex task and is not something I can help you with.

Likewise, you cannot access the store with two different versions of your application.

--mark

Greybird-Oracle

This is a duplicate of your other post:

Entity Versioning Issues

googol4u

is it possible to use something like store conversion to realize converting database to older version?  Any example for store conversion or RawStore?

Greybird-Oracle

Yes, that should work, good idea!

--mark