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JavaRanch » Java Forums » Databases » Object Relational Mapping
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Composite key mapping

Pallu Sagar

Joined: Dec 04, 2009
Posts: 16
I have Composite Primary key and foreign key which is also composite key. one of the column is same...

i.e. Table Group has composite Id PRIMARY KEY(gId, cId) [ Where cId is primary key of other table ]

Now Table GroupMember has composite primary key PRIMARY KEY(gmid, cId ) [ Where cId is primary key of other table ].

GroupMember also has foreign key fkgroup REFERENCES Group(gid, cId) (which is composite key as mentioned above]

Now, when I attemt to save GroupMember instance, foreign key (fkgroup) is not inserted. In many-to-one relationship I cannot set insert=true because cId is part of primary key for both GroupMember and Group Table.

How do I persist column fkgroup of GroupMemeber table?

It is sorta covered in the JavaRanch Style Guide.
subject: Composite key mapping
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