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Annotation Element javax.persistence.Column boolean nullable (Optional) Whether the database column is nullable. Default value: true Since: JPA 1.0


Annotation Element javax.persistence.Column boolean insertable (Optional) Whether the column is included in SQL INSERT statements generated by the persistence provider. Default value: true Since: JPA 1.0


Annotation Element javax.persistence.MapKeyColumn boolean updatable (Optional) Whether the column is included in SQL UPDATE statements generated by the persistence provider. Default value: true Since: JPA 2.0


Annotation Element javax.persistence.MapKeyColumn boolean unique (Optional) Whether the column is a unique key. This is a shortcut for the UniqueConstraint annotation at the table level and is useful for when the unique key constraint corresponds to only a single column. This constraint applies in


. Since: JDO 1.0 See Also: PersistenceCapable.jdoGetTransactionalObjectId() PersistenceManager.getObjectById(Object oid, boolean validate)


Method javax.jdo.PersistenceManager boolean getIgnoreCache() Get the ignoreCache setting for queries. IgnoreCache set to true specifies that for all Query instances created by this PersistenceManager, the default is the cache should be ignored for queries. Returns: the ignoreCache setting. Since: JDO 1.0

evictAll(subclasses, pcClass)

Method javax.jdo.PersistenceManager void evictAll( boolean subclasses, Class pcClass ) Mark the parameter instances as no longer needed in the cache. Parameters: subclasses - if true, mark instances of subclasses also pcClass - the class of instances to evict Since: JDO 2.1


: the owning PersistenceManager Since: JDO 1.0 boolean hasSubclasses() Returns whether this Extent

retrieveAll(useFetchPlan, pcs)

Method javax.jdo.PersistenceManager void retrieveAll( boolean useFetchPlan, Object... pcs ) Retrieve field values of instances from the store. This tells the PersistenceManager that the application intends to use the instances, and their field values should be retrieved. The fields in the current


Method javax.jdo.Transaction boolean getRollbackOnly() Returns the rollback-only status of the transaction. When begun, the rollback-only status is false. Either the application or the JDO implementation may set this flag using setRollbackOnly. Returns: true if the transaction has been marked for rollback. Since: JDO 2.0

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

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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