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EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Basic Mappings/Transient

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Revision as of 14:16, 27 October 2011 by (Talk | contribs) (Example: @Transient Annotation)

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By default, EclipseLink persistence provider assumes that all the fields of an entity are persistent.

Use the @Transient annotation or <transient> XML 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.

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For more information, see Section 8.1 "Entity" in the JPA Specification.

The @Transient annotation does not have attributes.

If a field is marked as Java transient it will also be ignored.

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
public class Employee implements Serializable {
    int id;
    Session currentSession;
Example: Using <transient> XML
<entity class="Employee">
        <id name="id"/>
        <transient name="currentSession"/>
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For more information, see Section 11.1.48 "Transient Annotation" in the JPA Specification.

Version: 2.1.0
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