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2.1.7

Suppose I have a bidirectional one-to-one mapping between classes A and B.

Following the model described in HIA, the mapping from A to B is a many-to-one with "unique=true". The mapping from B to A uses a one-to-one mapping with a "property-ref" attribute.

The db table for A (TABLE_A) has a foreign key (B_ID) into the table for B (TABLE_B).

Does the db table for B need a foreign key into the table for A? Said differently, does TABLE_B need A_ID?

HIA (p. 222 figure 6.7) implies that the second foreign key, the one that would link TABLE_B back to TABLE_A, is unnecessary. Is this correct?

thanks,

Miguel