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Difference between revisions of "EclipseLink/UserGuide/JPA/Basic JPA Development/Entities/Ids/Generating and Configuring Entity Identities"
< EclipseLink | UserGuide | JPA | Basic JPA Development
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|toc=n | |toc=n | ||
|eclipselink=y | |eclipselink=y | ||
− | |eclipselinktype=JPA}} | + | |eclipselinktype=JPA |
+ | |api=y | ||
+ | |apis= | ||
+ | *[http://www.eclipse.org/eclipselink/api/latest/javax/persistence/Id.html @Id] | ||
+ | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/IdClass.html @IdClass] | ||
+ | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/Emeddeded.html @Emeddeded] | ||
+ | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/GeneratedValue.html @GeneratedValue] | ||
+ | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/TableGenerator.html @TableGenerator] | ||
+ | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/SequenceGenerator.html @SequenceGenerator ] | ||
+ | |||
+ | }} | ||
= Generating and Configuring Entity Identities = | = Generating and Configuring Entity Identities = |
Revision as of 12:50, 8 April 2011
EclipseLink JPA
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Generating and Configuring Entity Identities
Every entity must have a persistent identity, which is an equivalent of a primary key in a database table that stores the entity state.
By default, the EclipseLink persistence provider assumes that each entity has at least one field or property that serves as a primary key.
You can generate and/or configure the identity of your entities by using the following annotations:
You can also use these annotations to fine-tune how your database maintains the identity of your entities.
Mapping | @Id | |
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