Fast Object Database for Java - with JPA/JDO support

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UPDATE SET Queries in JPA/JPQL

. Applying changes to the database by calling the commit method. JPQL UPDATE queries provide ... (which use other EntityManager instances) only after commit. Update All Queries The simpler form
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DELETE Queries in JPA/JPQL

. Applying changes to the database by calling the commit method. JPQL DELETE queries provide ... (which use other EntityManager instances) only after commit. Delete All Queries The simplest form
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Database Management Settings

of the database file with $ added at the end. Every transaction commit is first written to the recovery ... (whose value is "true" or "false") specifies if physical writing is required before commit returns
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[ODB1] Chapter 3 - Persistent Classes

to the database when the transaction is committed. ObjectDB must also know when a persistent field ... is going to be stored in the database during transaction commit. A possible action is to apply last
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Shared (L2) Entity Cache

the database and added to the shared cache. On commit - new and modified entity objects are added ... should be added to the cache on commit and on retrieval. The property has three valid values
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javax.jdo.Transaction

void commit() Commit the current transaction. Commit the current transaction. Throws: JDOUserException ... Since: JDO 1.0 boolean getOptimistic() Optimistic transactions do not hold data store locks until commit time. Optimistic transactions do not hold data store locks until commit time. Returns: the value
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javax.jdo.JDOEntityManager

at commit. Unlike makePersistent, which makes the closure of the instance persistent, the closure ... . The EntityTransaction instance may be used serially to begin and commit multiple transactions. Returns ... -transactional after commit. Make an instance non-transactional after commit. Normally, at transaction
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javax.jdo.PersistenceManager

. The data store object will be removed at commit. Unlike makePersistent, which makes the closure ... makeNontransactional(Object pc) Make an instance non-transactional after commit. Make an instance non-transactional after commit. Normally, at transaction completion, instances are evicted from the cache
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Step 3: Add a Main Class

.getTransaction().commit(); // Find the number of Point objects in the database
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Detached Entity Objects

invocation of rollback or by a commit failure. Explicit Merge Detached objects can be attached

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?

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