Populate PK(DBSequence) in three related tables with master detail association

Question

Hi
I use jdeveloper 11.1.1.6.0.
My English isn't very good.
I have 3 tables with master detail association between them and primary key from table A should populate to tables B and finally C .The primary key is a sequence from data base and I set PK attribute in table A as a DBSequence. (table C is the child of table B  and table B is the child of table A)
My association is like this: A->B(BAFk1Assoc) and B ->C(CBFk1Assoc)  and also I select Composition Association for these two association. And I select ‘Cascade Update Key Attribute’
When I insert row in these three related tables, a negative number create but when I COMMIT the PK populate only to table B not to table C and the exception below raises:
Constraint "C_B_FK1" is violated during post operation "Insert"
ORA-02291: integrity constraint (HR.C_B_FK1) violated - parent key not found.
If I only work with tables A and B, there isn't any problem but if I add table C as the child of B, this exception raises.
Habib

Answer 1

The question is how you create the row for table C. Do you create it as child from table b (using the VO for B and using the link to C)?
In this case the framework should populate the PK of the master row B as FK in table C.
You may need to control the order in which the rows are posted to the DB to avoid this problem. Read Advanced Entity Object Techniques - 11g Release 1 (11.1.1.6.0) to get more info about this.
However, sometimes it's easier to control the generation and setting if the PK attributes in the model layer, not relating on db triggers where you get the real values only after the commit operation is done in the db. For this you can use a Groovy expression so you have access to the PK of each new created row right after creation. Read Using Groovy Expression to set a Primary Key with a Sequence Number | JDev & ADF Goodies to find out how to do this.
Timo