Using a DB4O datastore JPOX allows you to query the objects in the datastore using the following
When using queries with DB4O there are some specific situations where it can be useful to
benefit from special treatment. These are listed here.
When using optimistic transactions all updates to data are held until flush()/commit(). This means
that executing a query may not take into account changes made during that transaction in some
objects. JPOX allows a convenience of calling flush() just before execution of queries so that
all updates are taken into account.
The property name is org.jpox.query.flushBeforeExecution and defaults to "false".
To do this on a per query basis for JDO2 you would do
query.addExtension("org.jpox.query.flushBeforeExecution","true");
To do this on a per query basis for JPA1 you would do
query.setHint("org.jpox.query.flushBeforeExecution","true");
You can also specify this for all queries using a persistence property
org.jpox.query.flushBeforeExecution which would then apply to ALL queries for that PMF/EMF.
