Hi Guido,
Guido Beutler wrote:
Hello,
I would like to copy complex objects from schema A to schema B.
I suppose you mean copy data from one DB to another or from table A to
table B within the same DB.
This would run in a managed environment (JBoss EJB Server)
The schema is configured at the XML Mapping, can I change this during runtime
like
1) read data from schema A
2) change schema
3) store the same objects to schema B
Is the change of the schema only for this transaction?
With default OJB settings no.
Because the mapping
configured at repository XML will be used by other transactions while the copy is running.
Exactly that's the problem. By default OJB use the same object metadata
for all transactions/threads, so metadata changes will immediately
noticed by all threads.
A PB instance can only "use" one metadata mapping, it's not possible to
use different metadata mapping parallel with same PB instance.
But it's possible to use different metadata mapping on per thread base.
Thus you can read the object using default schema A, then close current
PB, load metadata profile B (using the MetadataManager), lookup a new PB
instance (now associated with schema B).
http://db.apache.org/ojb/docu/guides/metadata.html#Per+thread+metadata+changes
regards,
Armin
best regards,
Guido
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