Hi,
I have a problem with the mapping when mixing read-only and editable
tables in JDO:
The hypothesis are :
- we have a table "Employee" with a 1-N relation to table "Company"
- table "Company" is mapped read-only
- relation employee-company is mapped normally : object
myapp.Employee has a field "company" of type myapp.Company
Now suppose we do the following in a transaction:
1) load company "A" and company "B"
2) create a new Employee with company "A"
3) make it persistent with with db.create()
4) change company: set it to "B"
5) commit transaction
Commit fails, due to a check in preStore method of ClassMolder.
In my understanding, this is what happens:
a) in class TransactionContext: since the class Company is mapped in
"read-only" mode, any of the myapp.Company objects participating
to current transaction are moved from HashTable _objects
into _readOnlyObjects (in method makeReadOnly)
b) in class ClassMolder, when performing preStore(), because
relation to company has changed,
it is updated, and this is where unconsistency arises:
at the end of the switch: case FieldMolder.PERSISTANCECAPABLE:
if ( value != null && !tx.isRecorded( value ) )
throw new PersistenceException(
"Object, "+object+", links to another object,"+value
+" that is not loaded/updated/created in this transaction");
I solved the problem adding the following limitation to the check :
&& !tx.isReadOnly( value )
is this problem referenced ?
thanks,
Vincent Gautier.
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