One to many with several tables on one side and a table on the side "several."
Sorry for the confusion in the title. Here's my question. In my program, I have 2 different tables that store the 2 different types of entities. Each entity has a list of attachments that I stored in a table of common attachments. There is a one-to-many relationship between the entity and the attachments table tables.() ENTITY_ONE
ID
NAME
)
() ENTITY_TWO
ID
NAME
)
ATTACHMENTS)
ID
ENTITY_ID
ATTACHMENT_NAME
)
ENTITY_ID of attachments table is used to link the attachments to the one entity or two entity. All codes are generated by a single sequence. Thus, they are always unique. My question is how can I map this relationship in the EntityOne, EntityTwo and attachment JAVA class?
For EntityOne and EntityTwo, you can simply define a normal OneToMany mapping using the foreign key.
You use the TopLink API or APP? JPA requires a mappedBy to the OneToMany, so this may be more difficult. You should be able to simply add a JoinColumn on the OneToMany and make the Insertable/editable = false column.
To fix, you could either map the foreign key as a Basic (DirectToFieldMapping) and maintain in force in your model or use a VariableOneToOne to TopLink mapping (this will require a common interface on behalf of entities).
---
James: http://www.eclipselink.org: http://en.wikibooks.org/wiki/Java_Persistence
Tags: Fusion Middleware
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