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IdClass.value Annotation Element IdClass" title="Annotation in javax.persistence">javax.persistence.IdClassClass value Primary key class Since: JPA 1.0 | |
JPA Primary Key IdClass">@IdClass(ProjectId.class) public class Project ... a special ID class that is attached to the entity class using the IdClass">@IdClass annotation. The ID class reflects the primary key fields and its objects | |
Posting Sample Code, The project does not contain a persistence unit, An entity or IdClass class should implement the java.io.Serializable interface). | |
JPA Annotations for Classes="IdClass"> ID classes are useful in representing composite primary keys as explained in | |
javax.persistence.metamodel.EntityType embedded id; returns false for an idclass. Returns: boolean | |
hasSingleIdAttribute() for a simple id or embedded id; returns false for an idclass. Returns: | |
javax.persistence.metamodel.MappedSuperclassType true for a simple id or embedded id; returns false for an idclass. | |
MapKey.name key. If the primary key is a composite primary key and is mapped as IdClass | |
javax.persistence.MapKey is used as the map key. If the primary key is a composite primary key and is mapped as IdClass |