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Fri, 16 October 2009 19:56

LexLythius

Messages: 2
Registered: October 2009

Junior Member

I have a table FOO represented by an entity class Foo. Each row in FOO can have 0 or more related rows in table FOO_TS. The latter is a very simple table with only one value field (a timestamp) and a key field (fooId) to associate with the main table.

Question is: how can I get all corresponding FOO_TS timestamps into a collection field in class Foo, without creating an entity class for those timestamps? It would be a burden to add a PK field+index into table BAR for just that purpose. By the same token, I want to avoid making a FooTimestamp entity with a composite PK or something of that sort.

Something like this:

@Entity
@Table(name="FOO")
class Foo {
  @Id
  private Integer fooId;

  private Set<Timestamp> timestamps = new HashSet<Timestamp>();

}

Thanks for any help

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Mon, 19 October 2009 14:37

James Sutherland

Messages: 1939
Registered: July 2009
Location: Ottawa, Canada

Senior Member

In EclipseLink you can use an @BasicCollection for this, or in EclipseLink 1.2 and JPA 2.0 you can use an @ElementCollection.

http://en.wikibooks.org/wiki/Java_Persistence/ElementCollect ion#Basic_Collections

James : Wiki : Book : Blog : Twitter

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