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JDO Doc
3

javax.jdo.spi.JDOImplHelper

class. The registration will be done in the class named JDOImplHelper loaded by the same or an ancestor ... . Returns: The PersistenceCapable superclass for this class, or null if there isn't one. Since: JDO 1 ... which will own the new instance. Returns: the new instance, or null if the class is not registered
JPA Doc
3

JPA Exceptions

to retrieve entity objects from the database. For example, when a required entity object is not found: or
Manual
3

ObjectDB Developer's Guide [2018-08-07]

ObjectDB. Prerequisite Knowledge A prior knowledge of database programming (SQL, JDBC, ORM or JPA) is not
Manual
3

SSL Configuration

" password="pwd" /> The enabled attribute of the ssl element (whose value is "true" or "false
Manual
3

FROM clause (JPQL / Criteria API)

, NEW, NOT, NULL, NULLIF, OBJECT, OF, OR, ORDER, OUTER, POSITION, SELECT, SET, SIZE, SOME, SQRT
Manual
3

DELETE Queries in JPA/JPQL

As explained in chapter 2, entity objects can be deleted from the database by: Retrieving the entity objects into an EntityManager. Removing these objects from the EntityManager within an active transaction, either explicitly by calling the remove method or implicitly by a cascading operation
FAQ
3

What is the Java Persistence API (JPA)?

to interact with a relational database such as Oracle, DB2, SQL Server or MySQL. The popular JPA
Manual
3

JPA Query API

should be used mainly when the query result type is unknown or when a query returns polymorphic
Manual
3

Date and Time in JPQL and Criteria Queries

and time expressions that represent the current date and/or time: // Create current date
FAQ
3

Where can I learn how to use ObjectDB?

experience in database development, SQL or JPA, but such experience is definitely not a prerequisite.