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Difference between revisions of "EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Basic Mappings/Transient"
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+ | By default, EclipseLink persistence provider assumes that all the fields of an entity are persistent. | ||
+ | |||
+ | Use the <tt>@Transient</tt> 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 <tt>@Transient</tt>. | ||
+ | |||
+ | This annotation can be used with <tt>@Entity</tt>, [[#@MappedSuperclass|<tt>@MappedSuperclass</tt>]]), and [[#@Embeddable|<tt>@Embeddable</tt>]]. | ||
+ | {{EclipseLink_Spec | ||
+ | |section=Section 8.1 "Entity"}} | ||
+ | |||
+ | The <tt>@Transient</tt> annotation does not have attributes. | ||
+ | |||
+ | The [[#Example 18-16|Usage of the @Transient Annotation]] example shows how to use the <tt>@Transient</tt> annotation to specify <tt>Employee</tt> field <tt>currentSession</tt> as not persistent. EclipseLink persistence provider will not persist this field. | ||
+ | |||
+ | |||
+ | <span id="Example 18-16"></span> | ||
+ | ''''' Usage of the @Transient Annotation''''' | ||
+ | <source lang="java"> | ||
+ | @Entity | ||
+ | public class Employee implements Serializable { | ||
+ | ... | ||
+ | @Id | ||
+ | int id; | ||
+ | |||
+ | @Transient | ||
+ | Session currentSession; | ||
+ | ... | ||
+ | } | ||
+ | </source> | ||
+ | |||
+ | {{EclipseLink_Spec | ||
+ | |section=Section 9.1.16 "Transient Annotation"}} | ||
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− | }} | + | |version= 2.1.0}} |
Revision as of 09:56, 21 June 2010
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@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 Usage of the @Transient Annotation example shows how to use the @Transient annotation to specify Employee field currentSession as not persistent. EclipseLink persistence provider will not persist this field.
Usage of the @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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