Hi,all
parent table:sale_contract
child table:sale_bill
sale_contract's PK is cont_no,need to assign value manually(not identity or sequence)
sale_bill'FK is cont_no
child will control the association(inverse="true")
middlegen create mapping files:SaleContract.hbm.xml,SaleBill.hbm.xml
and pojos: SaleContract.java,SaleBill.java
that time,middlegen will add a SaleCntract attribute to replace the cont_no attribute automaticlly in SaleBill.java
question is there:when I insert a new record,I can't set the cont_no because there has not a setter/getter of cont_no attribute in the SaleBill.java

SaleContract contract=new SaleContract();//parent
SaleBill bill=new SaleBill();//child
//there is no bill.setContNo()
bill.setBillNo(new Long(77));
bill.setBookId("77");
....
bill.setContract(contract);
contract.getDetail().add(bill);

session.save(contract);
tx.commit();
session.close();

how can I do?

You're thinking in terms of foreign keys, but you should think in terms of Object associations. Hibernate will set the cont_no column of the sale_bill table to the correct value, because you've called bill.setContract(contract). That is assuming that you're (generated) mappings are correct, of course.

The Java object is not supposed to have attributes that mirror the foreign key id's, it's supposed to be a proper object model that has associations (in this case, from a Bill to a Contract). This is basically how every O/R mapper works: try to read some more documentation, epecially the sample association mappings.

Joris

thank u for your suggestion,Joris,I think I've found the anwser.
I set the id field attribute 'unsaved-value=any' in the 2 mapping files, then is ok!