About Data Set

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JDO Doc
3

flush()

Methodjavax.jdo.PersistenceManager void flush() Flushes all dirty, new, and deleted instances to the data store. It has no effect if a transaction is not active. If a datastore transaction is active ... will set the current transaction's RollbackOnly flag (see Transaction.setRollbackOnly). Since: JDO 2.0
JPA Doc
3

javax.persistence.criteria.CollectionJoin

has not been obtained through correlation Since: JPA 2.0 Set< Fetch> getFetches() Return the fetch ... . Returns empty set if no fetch joins have been made from this type. Modifications to the set do not ... the join type. Returns: join type Since: JPA 2.0 Set< Join> getJoins() Return the joins
JPA Doc
3

javax.persistence.criteria.From

: IllegalStateException - if the From object has not been obtained through correlation Since: JPA 2.0 Set< Fetchset if no fetch joins have been made from this type. Modifications to the set do not affect the query. Returns: fetch joins made from this type Since: JPA 2.0
JPA Doc
3

javax.persistence.criteria.Join

through correlation Since: JPA 2.0 Set< Fetch> getFetches() Return the fetch joins that have been made from this type. Return the fetch joins that have been made from this type. Returns empty set if no fetch joins have been made from this type. Modifications to the set do not affect the query. Returns
JPA Doc
3

javax.persistence.criteria.ListJoin

through correlation Since: JPA 2.0 Set< Fetch> getFetches() Return the fetch joins that have been made from this type. Return the fetch joins that have been made from this type. Returns empty set if no fetch joins have been made from this type. Modifications to the set do not affect the query
JPA Doc
3

javax.persistence.criteria.MapJoin

been obtained through correlation Since: JPA 2.0 Set< Fetch> getFetches() Return the fetch joins ... set if no fetch joins have been made from this type. Modifications to the set do not affect ... . Returns: join type Since: JPA 2.0 Set< Join> getJoins() Return the joins that have been made from
JPA Doc
3

javax.persistence.criteria.PluralJoin

object has not been obtained through correlation Since: JPA 2.0 Set< Fetch> getFetches() Return ... this type. Returns empty set if no fetch joins have been made from this type. Modifications to the set ... . Return the join type. Returns: join type Since: JPA 2.0 Set< Join> getJoins() Return the joins
JPA Doc
3

javax.persistence.criteria.Root

object has not been obtained through correlation Since: JPA 2.0 Set< Fetch> getFetches() Return ... this type. Returns empty set if no fetch joins have been made from this type. Modifications to the set ... : the Java type of the tuple element Since: JPA 2.0 Set< Join> getJoins() Return the joins
Forum
3

Externalising persistence.xml properties in Glassfish?

- the environment already is set up with the Postgres jta-data-source, so the persistence.xml is environment ... .ObjectDbJPAMockProvider data-source>jdbc/jpaProviderMockPooldata-source ... . That is the easiest solution.  Another way might be by setting a system variable with the url
FAQ
3

Can I use ObjectDB to access a relational database?

To access relational databases using the Java Persistence API (JPA) you will need an Object Relational Mapping (ORM) tool, such as Hibernate, TopLink, EclipseLink, Open JPA or DataNucleus. The DataNucleus ORM implementation supports also the Java Data Objects (JDO) API. ObjectDB is a full featured