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| − | {{EclipseLink_UserGuide
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| − | |info=y
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| − | |toc=n
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| − | |eclipselink=y
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| − | |eclipselinktype=JPA
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| − | |api=y
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| − | |apis=
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| − | *[http://www.eclipse.org/eclipselink/api/latest/javax/persistence/Id.html @Id]
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| − | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/IdClass.html @IdClass]
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| − | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/Embedded.html @Embedded]
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| − | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/GeneratedValue.html @GeneratedValue]
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| − | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/TableGenerator.html @TableGenerator]
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| − | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/SequenceGenerator.html @SequenceGenerator ]
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| − | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/package-summary.html Package javax.persistence]
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| − | }}
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| − |
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| − | = Generating and Configuring Entity Identities =
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| − |
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| − | Every entity must have a persistent identity, which is an equivalent of a primary key in a database table that stores the entity state.
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| − | By default, the [[EclipseLink/UserGuide/JPA/Basic JPA Development/Configuration/JPA/persistence.xml|EclipseLink persistence provider]] assumes that each entity has at least one field or property that serves as a primary key.
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| − |
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| − | You can generate and/or configure the identity of your entities by using the following annotations:
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| − |
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| − | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/Id|@Id]]
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| − | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/IdClass|@IdClass]]
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| − | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/EmbeddedId|@EmbeddedId]]
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| − | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/GeneratedValue|@GeneratedValue]]
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| − | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/TableGenerator|@TableGenerator]]
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| − | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/SequenceGenerator|@SequenceGenerator ]]
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| − | You can also use these annotations to fine-tune how your database maintains the identity of your entities.
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| − | <br>
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| − | {{EclipseLink_JPA
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| − | |previous=[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping|Mapping]]
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| − | |next=[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entity/Id|@Id]]
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| − | |up=[[EclipseLink/UserGuide/JPA/Basic JPA Development|Basic JPA Development]]
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| − | |version=2.2.0 DRAFT}}
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