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Difference between revisions of "EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Basic Mappings/Transient"

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(@Transient)
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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.
  
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).
+
Use the <tt>@Transient</tt> annotation or <code><transient</code> 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 <tt>@Transient</tt>.
 
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>]].
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This annotation can be used with <tt>@Entity</tt>, [[#@MappedSuperclass|<tt>@MappedSuperclass</tt>]], and [[#@Embeddable|<tt>@Embeddable</tt>]].
 
{{EclipseLink_Spec
 
{{EclipseLink_Spec
 
|section=Section 8.1 "Entity"}}
 
|section=Section 8.1 "Entity"}}
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======'' Example: @Transient Annotation''======
 
======'' Example: @Transient Annotation''======
 
<source lang="java">
 
<source lang="java">
@Entity
+
@Entity
public class Employee implements Serializable {
+
public class Employee implements Serializable {
    ...
+
    ...
    @Id
+
    @Id
    int id;
+
    int id;
+
 
    @Transient
+
    @Transient
    Session currentSession;
+
    Session currentSession;
    ...
+
    ...
}
+
}
 
</source>
 
</source>
  

Revision as of 13:51, 27 October 2011

EclipseLink JPA

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@Transient

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.

Elug javaspec icon.gif

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;
    ...
}
Elug javaspec icon.gif

For more information, see Section 11.1.48 "Transient Annotation" in the JPA Specification.


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