On Sep 1, 2009, at 8:54 PM, Andrew Lindesay wrote:
Hello;
Possibly this is because Derby does not support deferred referential
integrity checks.
I think Chuck wrote something which organises the adaptor operations
to try and not violate the constraints from the model, but I don't
know if it is infallible -- cue for Chuck to make a bold claim about
his code being infallible.
Basically, what is happening is that the second object that has a FK
pointing to the first object is, in fact, being inserted into the DB
first. WO knows what the PK of the first object _will_ be when
inserted so it has no problem telling the DB what the FK is. Since no
record for the first object exists in the DB with that PK, the DB fails.
Most databases have a function to defer foreign-key constraints until
the end of the transaction so you can basically say "trust me, by the
time this transaction is committed, everything will be okay". If Derby
doesn't have this function, then you will need to tell EOF to put all
DB inserts in sequence before sending them to the database. It is
possible that Derby does support this, but the plugin doesn't make use
of it.
Chuck's Entity Ordering works phenomenally well, but has a couple semi-
weak points when it comes to rare edge-cases. It's best to use
deferred constraints if you can, or make use of the Entity Ordering. I
don't have the details right now of how to get it setup. If Chuck
doesn't get out of bed soon and give you the details (after a cup of
coffee, of course, I'll try to get to it in a little later.
Dave
cheers.
Next exception:SQL State:23503 -- error code: 20000 -- msg:
INSERT on table 'ENTRY' caused a violation of foreign key
constraint 'ENTRY_USERPORTAL_FK' for key (15). The statement has
been rolled back.
___
Andrew Lindesay
www.lindesay.co.nz
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