How to mapping domain tables

Question

Hi,
I am new one to Kodo and have a question about how to mapping with FK of the domain tables. For example, the magazine table has a fk refering to publisher table. So, the Magazine object has mag_id (pk) and publisher (fk, object of Publisher). The Publisher will have pub_id as pk. What kind of mapping it needs? By the way, the database has fk constraints on.
Thanks in advance,
Michael

Answer 1

pk means primary key and fk means foreign key. I use kodo-jdo-3.4.1.
You are right, the example is similar to the example in the user guide. Table magazine has mag_id as pk, publisher_id, a foreign key constraint with table publisher, and other columns. So, the publisher table is a domain table. The database has non-deferred foreign key constraint.
I define the following classes:
class Magazine
String mag_id; //pk
Publisher pub;
class Publisher
String pub_id; //pk
I use one-one mapping at field pub of Magazine to publisher as Column.PUB_ID = "PUB_ID" in mapping file. However, it doesn't work.
When I try to insert a new magazine record into magazine table, the database will check table Publisher for foreign key constraint, and then the kodo will automatically try to insert a new record into publisher table.
I know something wrong in my mapping. What should I do?
Thanks,
Michael