Hi,I'm working on a back end for OpenJPA that has relational and non- relational access paths. I'm extending JDBCStoreManager so I can do some work via the relational path and some via the non-relational path.
I'm currently stuck on relationship handling.I have a simple one-many relationship expressed as a column on the many side that is a foreign key to the one side. What I don't quite get is how the StoreManager is supposed to interact with the StateManager. I read the javadoc:
The fetchXXXField and storeXXXField methods can be used to get and set fields of the managed persistent object. Most back-end code, however, should use the similar fetchXXX and storeXXX methods in place of the field methods. These methods function just like the field methods, but also pass the value through the externalizer and factory the field may have.
So in the case of the relationship field called "a" that refers to an instance of "A", the column is "a_id". Is the relationship handling supposed to be done by the externalizer, or by the StoreManager knowing what to do with the foreign key handling?
A few pointers to where the code implements the relationships would help. I've tried to read the JDBCStoreManager for inspiration but it's a bit opaque to me at the moment. I can't seem to find much on the interaction of StateManager and StoreManager in any of our docs.
Thanks, Craig Craig L Russell Architect, Sun Java Enterprise System http://db.apache.org/jdo 408 276-5638 mailto:[email protected] P.S. A good JDO? O, Gasp!
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