Fast Object Database for Java - with JPA/JDO support

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Element.deleteAction

Annotation Element javax.jdo.annotations.Element ForeignKeyAction deleteAction Delete action to apply to any foreign key for the element. Returns: delete action to apply to any foreign key for the element Default value: javax.jdo.annotations.ForeignKeyAction.UNSPECIFIED Since: JDO 2.1
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ForeignKey.deleteAction

Annotation Element javax.jdo.annotations.ForeignKey ForeignKeyAction deleteAction The delete action of this foreign key. Returns: the delete action of this foreign key Default value: javax.jdo.annotations.ForeignKeyAction.RESTRICT Since: JDO 2.1
3

preDelete(event)

Method javax.jdo.listener.DeleteLifecycleListener void preDelete( InstanceLifecycleEvent event ) Invoked whenever a persistent instance is deleted, for example during javax.jdo.PersistenceManager ... the instance callback DeleteCallback.jdoPreDelete. Parameters: event - the delete event. Since: JDO 2.0
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Persistent.dependent

Annotation Element javax.jdo.annotations.Persistent String dependent Whether related object(s) of this member are dependent and so deleted when this object is deleted. Returns: whether the related object(s) of this member are dependent Default value: "" Since: JDO 2.1
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deletePersistentAll(parameters)

Method javax.jdo.Query long deletePersistentAll( Object... parameters ) Deletes all the instances of the candidate class that pass the filter. Parameters: parameters - for the query Returns: the number of instances of the candidate class that were deleted Since: JDO 2.0 See Also: deletePersistentAll()
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javax.jdo.ObjectState

ObjectState PERSISTENT_CLEAN Since: JDO 1.0 ObjectState PERSISTENT_DELETED Since: JDO 1.0 ObjectState ... _DELETED Since: JDO 1.0 ObjectState PERSISTENT_NONTRANSACTIONAL_DIRTY Since: JDO 1.0 ObjectState
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javax.persistence.LockModeType

. Another transaction T2 then modifies or deletes that row, before T1 has committed. Both transactions eventually ... a row. Another transaction T2 then modifies or deletes that row, before T1 has committed or rolled
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Value.dependent

Annotation Element javax.jdo.annotations.Value String dependent Whether the value is dependent on the owner (and will be deleted when the owner is deleted). Returns: whether the value is dependent on the owner Default value: "" Since: JDO 2.1
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Key.dependent

Annotation Element javax.jdo.annotations.Key String dependent Whether the key is dependent on the owner (and will be deleted when the owner is deleted). Returns: whether the key is dependent on the owner Default value: "" Since: JDO 2.1
3

Attempt to open a non existing file '/tmp/objectdb_xxxx/SortQueryItr_6.mrg'

one application deleted the tmp file of another application. I hope this description is sufficient. EKK EKK Emmanuel Keskes ObjectDB deletes its temporary files in 2 ways: Every process deletes ... it tries to delete temporary files of other processes that are not locked (active temporary files

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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