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2

getStackTrace()

Method java.lang.Throwable StackTraceElement[] getStackTrace() Provides programmatic access to the stack trace information printed by printStackTrace(). Returns an array of stack trace elements, each representing one stack frame. The zeroth element of the array (assuming the array's length is non
2

unwrap(cls)

Method javax.persistence.Query T unwrap( Class<T> cls ) Return an object of the specified type to allow access to the provider-specific API. If the provider's query implementation does not support the specified class, the PersistenceException is thrown. Parameters: cls - the class of the object
2

Best practise loading big data

access on a large 2 dimansional table. Internally we used a list entities which hold a list ... . We have some prominent scenarios to access these values. Creating and traversing. For the traversing we access the data block by block - in each block step by step and in each step value by value
0

preDelete(event)

Method javax.jdo.listener.DeleteLifecycleListener void preDelete( InstanceLifecycleEvent event ) Invoked whenever a persistent instance is deleted, for example during javax.jdo.PersistenceManager.deletePersistent. Access to field values within this call are permitted. This method is called before
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postDelete(event)

Method javax.jdo.listener.DeleteLifecycleListener void postDelete( InstanceLifecycleEvent event ) Invoked whenever a persistent instance is deleted, for example during javax.jdo.PersistenceManager.deletePersistent. This method is called after the instance transitions to persistent-deleted. Access
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javax.jdo.listener.StoreCallback

access to the PersistenceManager and other persistent JDO instances. Since: JDO 2.0
0

PersistenceCapable.LOAD_REQUIRED

Static Field javax.jdo.spi.PersistenceCapable byte LOAD_REQUIRED If jdoFlags is set to LOAD_REQUIRED, then the fields in the default fetch group cannot be accessed for read or write without notifying the StateManager. Since: JDO 1.0
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PersistenceCapable.READ_WRITE_OK

Static Field javax.jdo.spi.PersistenceCapable byte READ_WRITE_OK If jdoFlags is set to READ_WRITE_OK, then the fields in the default fetch group can be accessed for read or write without notifying the StateManager. Since: JDO 1.0
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PersistenceCapable.READ_OK

Static Field javax.jdo.spi.PersistenceCapable byte READ_OK If jdoFlags is set to READ_OK, then the fields in the default fetch group can be accessed for read without notifying the StateManager. Since: JDO 1.0
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getPersistenceManager()

Method javax.jdo.Extent PersistenceManager getPersistenceManager() An Extent is managed by a PersistenceManager; this method gives access to the owning PersistenceManager. Returns: the owning PersistenceManager Since: JDO 1.0

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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