About mapped superclass

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JPA Doc
6

AttributeOverride.column

Annotation Element javax.persistence.AttributeOverride Column column (Required) The column that is being mapped to the persistent attribute. The mapping type will remain the same as is defined in the embeddable class or mapped superclass. Since: JPA 1.0
JPA Doc
6

javax.persistence.EmbeddedId

to a persistent field or property of an entity class or mapped superclass to denote a composite primary ... . The AttributeOverride annotation may be used to override the column mappings declared ... to the relationship to the parent entity. Relationship mappings defined within an embedded id class are not
JPA Doc
6

PrimaryKeyJoinColumn.name

of the primary table of the superclass (JOINED mapping strategy); the same name as the primary key column of the primary table (SecondaryTable mapping); or the same name as the primary key column for the table for the referencing entity (OneToOne mapping). Default value: "" Since: JPA 1.0
JPA Doc
6

PrimaryKeyJoinColumn.referencedColumnName

the primary key column of the primary table of the superclass (JOINED mapping strategy); the same name as the primary key column of the primary table (SecondaryTable mapping); or the same name as the primary key column for the table for the referencing entity (OneToOne mapping). Default value: "" Since: JPA 1.0
Forum
6

Index on map key

Is there a way to create an Index with @Index on the key of a map? Indexes on map keys as well as queries on map keys are currently not supported. But as a workaround you can use a collection ... ();         Query query = em.createQuery(             "SELECT o FROM MyEntity o JOIN o.map e WHERE e.key
Manual
6

Database Connection using JPA

of the createEntityManagerFactory method takes a map of persistence unit properties as a second parameter: Mapmap ... for instantiation of EntityManager that, like the factory, takes a map of properties as an argument
Manual
6

Retrieving JPA Entity Objects

collection and map persistent fields (i.e. through one-to-one and many-to-one relationships ... through non collection and map persistent fields are also retrieved. Theoretically, in some extreme ... ) private Employee manager; : } The default for non collection and map references is FetchType
Result
6

ObjectDB Object Database Features [2018-01-27]

elements are indexable (extremely fast JOIN queries). Map keys and values are indexable. Nested paths ... . Easy Learning Curve Easier than other JPA solutions - no need to learn and use O/R mapping. Easier ... to most developers. Friendly API JPA is very simple, except for mapping, which is irrelevant to ObjectDB
Result
6

ObjectDB Object Database Features [2018-10-27]

elements are indexable (extremely fast JOIN queries). Map keys and values are indexable. Nested paths ... . Easy Learning Curve Easier than other JPA solutions - no need to learn and use O/R mapping. Easier ... to most developers. Friendly API JPA is very simple, except for mapping, which is irrelevant to ObjectDB
Result
6

ObjectDB Object Database Features

(extremely fast JOIN queries). Map keys and values are indexable. Nested paths inside embedded objects ... than other JPA solutions - no need to learn and use O/R mapping. Easier to learn than other Object ... JPA is very simple, except for mapping, which is irrelevant to ObjectDB. Persistence is set using JPA