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Difference between revisions of "EclipseLink/UserGuide/JPA/Basic JPA Development/Entities/Ids/Generating and Configuring Entity Identities"
< EclipseLink | UserGuide | JPA | Basic JPA Development
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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. | 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 | + | 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 generate and/or configure the identity of your entities by using the following annotations: | ||
Revision as of 11:30, 19 April 2011
EclipseLink JPA
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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 |
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