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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

Method Invocation On All Entities

Deleting or changing a field of all the entities of some type is fairly easy, using the DELETE ... should do some operations before it gets deleted, and at some point we want to delete all those entities. It could be usefull if we could invoke some "doBeforeDie" method before the deletion. One way to achive


Method javax.persistence.Query int executeUpdate() Execute an update or delete statement. Returns: the number of entities updated or deleted Throws: IllegalStateException - if called for a Java Persistence query language SELECT statement or for a criteria query TransactionRequiredException


., for update or delete. Create an instance of Query for executing a native SQL statement, e.g., for update or delete. Parameters: sqlString - a native SQL query string Returns: the new query instance


. 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

Removing of an entity removes also another entity type

. All ResolverMapping entities are removed by a query (DELETE FROM ...), afterwards ResolverMapping entities ... . If the ToleranceDefinition entity is removed from database by a query (DELETE FROM ...) then it performs. The data ... .1_03. btc_es BTC EmbeddedSystems OK. Thanks for the update. Please note that mixing direct DELETE


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


Method javax.jdo.Query long deletePersistentAll( Map 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()


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


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

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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