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Difference between revisions of "EclipseLink/UserGuide/JPA/Basic JPA Development/Entities/Creating and Configuring Entities"

(New page: {{EclipseLink_UserGuide |info=y |toc=n |eclipselink=y |eclipselinktype=JPA |api=y |apis= *[http://www.eclipse.org/eclipselink/api/latest/javax/persistence/Entity.html @Entity] }} = Creati...)
 
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*[http://www.eclipse.org/eclipselink/api/latest/javax/persistence/Entity.html @Entity]
 
*[http://www.eclipse.org/eclipselink/api/latest/javax/persistence/Entity.html @Entity]
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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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= Creating and Configuring Entities =
 
= Creating and Configuring Entities =
  
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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 persistence provider assumes that each entity has at least one field or property that serves as a primary key.
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You can generate and/or configure the identity of your entities by using the following annotations:
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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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Revision as of 13:12, 8 April 2011

EclipseLink JPA


Creating and Configuring Entities

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.



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