[ http://issues.apache.org/jira/browse/OJB-18?page=all ]
Armin Waibel resolved OJB-18:
-----------------------------
Fix Version: 1.0.4
Resolution: Fixed
The user can disable the auto-ordering of persistence capable objects and
determine the object order by hand.
Additionally a custom attribute 'constraint' was introduced to allow
declaration of database FK constraint within 1:1 reference-descriptor. This
allows OJB to incorporate the FK constraint declaration in the ordering
algorithm.
> ODMG ordering problem with circular/bidirectional 1:1 references
> ----------------------------------------------------------------
>
> Key: OJB-18
> URL: http://issues.apache.org/jira/browse/OJB-18
> Project: OJB
> Type: Bug
> Components: ODMG-API
> Versions: 1.0.3
> Environment: all
> Reporter: Armin Waibel
> Assignee: Armin Waibel
> Fix For: 1.0.4
>
> odmg ordering problem when using circular/bidirectional 1:1 references, in
> this case the ordering of objects doesn't change at commit.
> Assume we have A-1:1->AA-1:1->AAA-1:1->A and the user persist the 'A'
> instance, then the expected order is
> [AAA, AA, A]
> because start is A (specified by the user) and the last new object of the
> circuit is AAA and for 1:1 references OJB first persist the reference. The
> PB-api show this ordering, odmg show [A, AA, AAA] in this case.
> The problem is the weight of the vertices in loops or circuits of 1:1
> references, because all vertices have the same weight, so the odering doesn't
> change.
> *workaround*
> Influence ordering by using TransactionExt.flush or make persist calls in the
> correct order for all objects of the circuit
> Example1, loop:
> tx.begin();
> Shop s1 = new Shop(name + "_1");
> // when using flush() we can use the "natural" order
> // without getting DB constraint violence.
> database.makePersistent(s1);
> // write to DB object without references
> tx.flush();
> ShopDetail sd = new ShopDetail(name + "_1");
> // now set references
> s1.setDetail(sd);
> sd.setShop(s1);
> // no need to persist the ShopDetail object
> // (will be detected by OJB)
> // but it doesn't matter if you do
> // database.makePersistent(sd);
> tx.commit();
> Example2, loop:
> tx.begin();
> Shop s1 = new Shop(name + "_1");
> ShopDetail sd = new ShopDetail(name + "_1");
> s1.setDetail(sd);
> sd.setShop(s1);
> // madatory to persist referenced ShopDetail first, the Shop
> // object will be detected automatic. In this case first the ShopDetail
> // will be created and then the Shop
> database.makePersistent(sd);
> database.makePersistent(s1);
> tx.commit();
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