Well, the order that EclipseLink chooses is RANDOM :)
It is a fairly simple example, only 1 entity with only 1
column.
I'd really expect that the INSERT statements are executed in
same order as the persist() calls.
My real-life use case is importing data from an XML file into
the database.
There are relations and FKs in my database and when exported
and re-imported the order of the XML entries, persist() calls
and INSERT statements is critical.
EclipseLink basically inserts each XML entry randomly.
Currently the only workaround is to flush after each persist
call. It could work for few hundred calls,
but not for few thousand.
JPA says nothing about the order of the database operations.
When writing the spec they probably have assumed that it would
be logical to execute the database operations in the
same order as the persist() or merge() calls.
This is not the case of mixed remove(), persist() and merge()
calls, in our case we have only persist() calls and the case is
very simple.
Best regards,
Deyan
em.persist() places INSERT query in the cache.