Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.
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Enum Constant javax.persistence.metamodel.Type.PersistenceType MAPPED_SUPERCLASS Mapped superclass Since: JPA 2.0
, Mapped superclasses, Embeddable classes. Simple Java data types: Primitive types, Wrappers, String ... Superclasses In JPA, classes that are declared as mapped superclasses have some of the features of entity ... superclasses are treated by ObjectDB as ordinary entity classes. Mapped superclasses are really
The following JPA annotations and enums are designated for mapping a JPA object model to a relational database, and are not required by ObjectDB: ObjectDB silently ignores all the above annotations.
All about Is ObjectDB better than Object Relational Mapping (ORM)? in Java/JPA database - explanations, examples, references, links and related information.
, embeddable classes and mapped superclasses) with related settings. Defining a persistence unit ... , embeddable classes and mapped superclasses), which are referred to by JPA as managed classes, as ... .Provider</provider> <mapping-file>META-INF/mappingFile.xml</mapping-file> <jar-file
Fields of persistable user defined classes (entity classes, embeddable classes and mapped superclasses) can be classified into the following five groups: Transient fields Persistent fields Inverse (Mapped By) fields Primary key (ID) fields Version field The first three groups (transient, persistent
is attached to exactly one entity class or mapped superclass - usually to the most relevant entity ... that named queries may be attached to any entity class or mapped superclass. Therefore, to be able ... can be defined in JPA XML mapping files instead of using the @NamedQuery annotation. ObjectDB supports JPA XML
The following JDO annotations and enums are designated for mapping a JDO object model to a relational database, and are not required by ObjectDB: ObjectDB silently ignores all the above annotations.
> <package name="test"> <class name="B" /> <class name="C" persistence-capable-superclass="B ... > element can have one or more of the following optional attributes: persistence-capable-superclass The persistence-capable-superclass attribute usually specifies the direct super class
Enum Constant javax.jdo.annotations.InheritanceStrategy SUPERCLASS_TABLE Since: JDO 2.1