Fast Object Database for Java - with JPA/JDO support

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FROM clause (JPQL / Criteria API)

,DELETE, DESC, DISTINCT, ELSE, EMPTY, END, ENTRY, ESCAPE, EXISTS, FALSE, FETCH,FROM, GROUP, HAVING
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Posting Sample Code

, delete or move any post at its sole discretion. 2. Content and Readability To keep your post
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Obtaining a JPA Database Connection

, update, and delete should only be performed within an active transaction. Given an EntityManager, em
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Database Doctor

over FTP in ASCII mode (BINARY mode should be used). Deleting an ObjectDB database recovery file or
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General Settings and Logging

. After that period an archived log file is automatically deleted. The elements
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Database Schema Evolution

Modifications to entity classes that do not change their persistent field definitions (their schema) are transparent to ObjectDB. This includes adding, removing and modifying constructors, methods and non persistent fields. However, additions, deletions and modifications to the persistent fields
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How to install ObjectDB?

ObjectDB is distributed as a zip file. Just download and extract the ObjectDB distribution zip file. No need to run any install or setup program. You can uninstall ObjectDB by deleting the ObjectDB directory. ObjectDB does not modify the registry or any other system file.
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JPA Primary Key

are deleted from the database. The primary key value of an entity can be accessed by declaring a primary
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javax.jdo.PersistenceManager

.0 void deletePersistent(Object pc) Delete the persistent instance from the data store. Delete ... of the instance persistent, the closure of the instance is not deleted from the data store. This method has no effect if the instance is already deleted in the current transaction. This method throws
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deletePersistentAll()

Method javax.jdo.Query long deletePersistentAll() Deletes all the instances of the candidate class that pass the filter. Returns the number of instances of the candidate class that were deleted ... if deletePersistent were called on them. Specifically, if the class of deleted instances implements

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.

Need Help?

  1. Search ObjectDB website
  2. Read the FAQ
  3. Follow the Tutorials
  4. View or post in the forum
  5. Search or file an issue
  6. Contact support