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.
Difference between revisions of "EclipseLink/UserGuide/JPA/Basic JPA Development/Entities/Ids/Generating and Configuring Entity Identities"
< EclipseLink | UserGuide | JPA | Basic JPA Development
| Line 3: | Line 3: | ||
|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
| EclipseLink | |
| Website | |
| Download | |
| Community | |
| Mailing List • Forums • IRC • mattermost | |
| Issues | |
| Open • Help Wanted • Bug Day | |
| Contribute | |
| Browse Source |
Key API
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 |
|
 EclipseLink Home
JPA User Guide: |
||
| How to contribute to this guide... | ||
