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

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{{EclipseLink_UserGuide|info=y|toc=n}}
 
{{EclipseLink_UserGuide|info=y|toc=n}}
 
=@Transient=
 
=@Transient=
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By default, EclipseLink persistence provider assumes that all the fields of an entity are persistent.
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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).
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EclipseLink persistence provider will not persist (or create database schema) for a property or field annotated with <tt>@Transient</tt>.
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This annotation can be used with <tt>@Entity</tt>, [[#@MappedSuperclass|<tt>@MappedSuperclass</tt>]]), and [[#@Embeddable|<tt>@Embeddable</tt>]].
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{{EclipseLink_Spec
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|section=Section 8.1 "Entity"}}
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The <tt>@Transient</tt> annotation does not have attributes.
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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.
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<span id="Example 18-16"></span>
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''''' Usage of the @Transient Annotation'''''
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<source lang="java">
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@Entity
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public class Employee implements Serializable {
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    ...
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    @Id
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    int id;
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    @Transient
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    Session currentSession;
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    ...
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}
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</source>
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{{EclipseLink_Spec
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|section=Section 9.1.16 "Transient Annotation"}}
  
  
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|next=    [[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Basic Mappings/Column|Column]]
 
|next=    [[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Basic Mappings/Column|Column]]
 
|up=      [[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Basic Mappings|Basic Mappings]]
 
|up=      [[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Basic Mappings|Basic Mappings]]
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}}
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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.

Elug javaspec icon.gif

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;
     ...
 }
Elug javaspec icon.gif

For more information, see Section 9.1.16 "Transient Annotation" in the JPA Specification.


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Version: 2.1.0
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