Package javax.persistence
Annotation Interface ElementCollection
Specifies a collection of instances of a basic type or embeddable
class.
Must be specified if the collection is to be mapped by
means of a collection table.
Example: @Entity public class Person { @Id protected String ssn; protected String name; ... @ElementCollection protected Set<String> nickNames = new HashSet(); ... }
- Since:
- Java Persistence 2.0
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Optional Element Summary
Modifier and TypeOptional ElementDescription(Optional) Whether the collection should be lazily loaded or must be eagerly fetched.(Optional) The basic or embeddable class that is the element type of the collection.
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Element Details
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targetClass
Class targetClass(Optional) The basic or embeddable class that is the element type of the collection. This element is optional only if the collection field or property is defined using Java generics, and must be specified otherwise. It defaults to the paramterized type of the collection when defined using generics.- Default:
- void.class
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fetch
FetchType fetch(Optional) Whether the collection should be lazily loaded or must be eagerly fetched. The EAGER strategy is a requirement on the persistence provider runtime that the collection elements must be eagerly fetched. The LAZY strategy is a hint to the persistence provider runtime.- Default:
- LAZY
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