Notice: this Wiki will be going read only early in 2024 and edits will no longer be possible. Please see: https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/wikis/Wiki-shutdown-plan for the plan.
EclipseLink/UserGuide/JPA/Basic JPA Development/Entities/Ids/Generating and Configuring Entity Identities
< EclipseLink | UserGuide | JPA | Basic JPA Development
Revision as of 12:10, 15 June 2010 by Rick.sapir.oracle.com (Talk | contribs) (New page: =Entity= 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/UserGuide/JP...)
Entity
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:
- @Id
- @IdClass
- @EmbeddedId
- @GeneratedValue
- @TableGenerator
- @SequenceGenerator
You can also use these annotations to fine-tune how your database maintains the identity of your entities.
 Mapping |
@Id |
|
 EclipseLink Home
JPA User Guide: |
||
| How to contribute to this guide... | ||
