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By default, EclipseLink persistence provider assumes that all the fields of an entity are persistent. | By default, EclipseLink persistence provider assumes that all the fields of an entity are persistent. |
Revision as of 11:40, 2 May 2011
EclipseLink JPA
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Key API
@Transient
By default, EclipseLink persistence provider assumes that all the fields of an entity are persistent.
Use the @Transient annotation to specify a field or property of an entity that is not persistent (for example, a field or property that is used at run time, but that is not part of the entity's state).
EclipseLink persistence provider will not persist (or create database schema) for a property or field annotated with @Transient.
This annotation can be used with @Entity, @MappedSuperclass), and @Embeddable.
For more information, see Section 8.1 "Entity" in the JPA Specification.
The @Transient annotation does not have attributes.
The following example shows how to use the @Transient annotation to specify Employee field currentSession as not persistent. EclipseLink persistence provider will not persist this field.
Example: @Transient Annotation
@Entity public class Employee implements Serializable { ... @Id int id; @Transient Session currentSession; ... }
For more information, see Section 9.1.16 "Transient Annotation" in the JPA Specification.
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