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-many mapping to represent the relationship between a single source object and a collection of target objects. This relationship is a good example of something that is simple to implement in Java using a Vector
(or other collection types) of target objects, but difficult to implement using relational databases.
You define a one-to-many mapping at one of the property (getter or setter method) or field level of your entity.
For more information, see "Understanding One-to-Many 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#onetomany
.Example 7-22 shows how to use the @OneToMany
annotation to specify an one-to-many mapping for field managedEmployees
.