Fast Object Database for Java - with JPA/JDO support

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javax.jdo.Query

the cache. For optimistic transactions, this can dramatically improve query response times
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refresh(pc)

Methodjavax.jdo.PersistenceManager void refresh( Object pc ) Refresh the state of the instance from the data store. In an optimistic transaction, the state of instances in the cache might not match the state in the data store. This method is used to reload the state of the instance from the data
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makeTransactional(pc)

before the first change in the transaction. For persistent instances read in optimistic transactions
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refresh(pc)

Method javax.jdo.PersistenceManager void refresh( Object pc ) Refresh the state of the instance from the data store. In an optimistic transaction, the state of instances in the cache might not match the state in the data store. This method is used to reload the state of the instance from the data
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flush()

Methodjavax.jdo.PersistenceManager void flush() Flushes all dirty, new, and deleted instances to the data store. It has no effect if a transaction is not active. If a datastore transaction is active, this method synchronizes the cache with the datastore and reports any exceptions. If an optimistic
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setIgnoreCache(ignoreCache)

might be able to optimize the query execution by ignoring changed values in the cache. For optimistic
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getDataStoreConnection()

Method javax.jdo.PersistenceManager JDOConnection getDataStoreConnection() If this method is called while a datastore transaction is active, the object returned will be enlisted in the current transaction. If called in an optimistic transaction or outside an active transaction, the object returned
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javax.jdo.JDOHelper

are standard key names: "javax.jdo.PersistenceManagerFactoryClass" "javax.jdo.option.Optimistic", "javax.jdo
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flush()

Method javax.jdo.PersistenceManager void flush() Flushes all dirty, new, and deleted instances to the data store. It has no effect if a transaction is not active. If a datastore transaction is active, this method synchronizes the cache with the datastore and reports any exceptions. If an optimistic
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getConnectionFactory2Name()

Method javax.jdo.PersistenceManagerFactory String getConnectionFactory2Name() Get the name for the second data store connection factory. This is needed for managed environments to get nontransactional connections for optimistic transactions. Returns: the name of the data store connection factory. 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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