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Difference between revisions of "EclipseLink/UserGuide/JPA/Basic JPA Development/Entities/Creating and Configuring Entities"
< EclipseLink | UserGuide | JPA | Basic JPA Development
(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] | ||
| + | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/IdClass.html @IdClass] | ||
| + | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/Embedded.html @Embedded] | ||
| + | * [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 ] | ||
| + | * [http://www.eclipse.org/eclipselink/api/latest/javax/persistence/package-summary.html Package javax.persistence] | ||
| + | |||
}} | }} | ||
= Creating and Configuring Entities = | = 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: | ||
| + | |||
| + | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/Id|@Id]] | ||
| + | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/IdClass|@IdClass]] | ||
| + | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/EmbeddedId|@EmbeddedId]] | ||
| + | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/GeneratedValue|@GeneratedValue]] | ||
| + | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/TableGenerator|@TableGenerator]] | ||
| + | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/SequenceGenerator|@SequenceGenerator ]] | ||
| + | |||
| + | You can also use these annotations to fine-tune how your database maintains the identity of your entities. | ||
| + | <br> | ||
<br> | <br> | ||
Revision as of 14:12, 8 April 2011
EclipseLink JPA
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Key API
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.
