Oracle® Containers for J2EE Enterprise JavaBeans Developer's Guide 10g (10.1.3.1.0) Part Number B28221-02 |
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Use an one-to-one mapping to represent simple pointer references between two Java objects. In Java, a single pointer stored in an attribute represents the mapping between the source and target objects. Relational database tables implement these mappings using foreign keys.
You define an one-to-one mapping at one of the property (getter or setter method) or field level of your entity.
For more information, see "Understanding One-to-One Mapping" in the Oracle TopLink Developer's Guide.
Note:
For an EJB 3.0 basic mapping code example, see:http://www.oracle.com/technology/tech/java/oc4j/ejb3/howtos-ejb3/howtoejb30mappingannotations/doc/how-to-ejb30-mapping-annotations.html#onetoone
.Example 7-20 shows how to use the @OneToOne
annotation to specify an one-to-one mapping for field address
.