How to specify multiple sequence for multiple fields in a primary key!

Question

Hi,
i have a table which has about 15 fields, one of the field is primary key and i am able to specify the sequence for it using toplink and when the object is created through toplink the sequence get generated automatically, which is fine.
Now i have to add another sequence generated field to the table this field is not nullable and
i am looking for a way in toplink to specify the sequence for this field too, so that when we create objects through toplink the value for the field is automatically generated instead of us fetching the next value from sequence using a sql statement and then using the set method for the field.
is there a way i can specify a sequence for another field through toplink, while keeping the sequence settings for the primary field untouched.
thanks for your help!
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Answer 1

TopLink only supports a single sequence field in its' mappings. There should be an API you can use to get another sequence number from an event, but I could not find an easy one (please log a bug for this on EclipseLink). The following code might work if you define the other sequence in TopLink, but you could also just execute the raw SQL as you are doing.
i.e. something like,
preInsert(DescriptorEvent event) {
MyObject object = (MyObject) event.getObject();
object.setOtherId(event.getSession().getDatasourcePlatform().getSequence("MY_OTHER_SEQ").getGeneratedValue(event.getSession().getAccessor(), event.getSession()));
-- James : http://www.eclipselink.org