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FAQ
7

What is the Java Data Objects (JDO)?

The Java Data Objects (JDO) is another standard for accessing persistent data in databases, using plain old Java objects (POJO) to represent the object model. Unlike Java Persistence API (JPA), which is designated to be used with relational databases, JDO is designated to be used
FAQ
7

What is the Java Persistence API (JPA)?

The Java Persistence API (JPA) is a standard API for accessing databases from within Java applications. The main advantage of JPA over JDBC (the older Java API for interacting with databases) is that in JPA data is represented by classes and objects rather than by tables and records as in JDBC
Manual
7

SELECT clause (JPQL / Criteria API)

) + ", Capital: " + t.get(1)); } The Tuple interface defines several other methods for accessing
JPA Doc
5

javax.persistence.AccessType

> Is used with the Access annotation to specify an access type to be applied to an entity class ... See Also: Access AccessType FIELD Field-based access is used. Field-based access is used. Since: JPA 2.0 AccessType PROPERTY Property-based access is used. Property-based access is used. Since: JPA 2.0
JPA Doc
5

javax.persistence.EntityManager

Metamodel getMetamodel() Return an instance of Metamodel interface for access to the metamodel of the persistence unit. Return an instance of Metamodel interface for access to the metamodel ... accessed. (The persistence provider runtime is permitted to throw the EntityNotFoundException
JDO Doc
5

javax.jdo.spi.PersistenceCapable

to LOAD_REQUIRED, then the fields in the default fetch group cannot be accessed for read or write ... fetch group cannot be accessed for read or write without notifying the StateManager. Since: JDO 1.0 ... can be accessed for read without notifying the StateManager. If jdoFlags is set to READ_OK, then the fields
JPA Doc
5

javax.persistence.EntityManagerFactory

Cache getCache() Access the cache that is associated with the entity manager factory (the "second level cache"). Access the cache that is associated with the entity manager factory (the "second level ... an instance of Metamodel interface for access to the metamodel of the persistence unit. Return
JDO Doc
4

javax.jdo.InstanceCallbacks

should be initialized in this method. The context in which this call is made does not allow access to other persistent ... transition to persistent-deleted or persistent-new-deleted. Access to field values within this call are valid. Access to field values after this call are disallowed. This method is modified by
JPA Doc
4

javax.persistence.AssociationOverride

if property-based access is being used, or the name of the relationship field if field-based access ... if property-based access is being used, or the name of the relationship field if field-based access is used. Since: JPA 1.0
JPA Doc
4

javax.persistence.AttributeOverride

of the property whose mapping is being overridden if property-based access is being used, or the name of the field if field-based access is used. (Required) The name of the property whose mapping is being overridden if property-based access is being used, or the name of the field if field-based access is used. Since: JPA 1.0