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6

Running JPA Queries

if no transaction is active. On success - the executeUpdate method returns the number of objects
5

javax.persistence.Query

query TransactionRequiredException - if there is no transaction QueryTimeoutException ... back PersistenceException - if the query execution exceeds the query timeout value set and the transaction is rolled ... - if a lock mode has been set and there is no transaction PessimisticLockException - if pessimistic
5

javax.persistence.spi.PersistenceUnitInfo

to be used by the persistence provider for accessing data outside a JTA transaction. Returns the non ... transaction. The data source corresponds to the named non-jta-data-source element in the persistence.xml ... to be used by the persistence provider for accessing data outside a JTA transaction Since: JPA 1.0 String
0

makeTransactional(pc)

to transactional boundaries. Transient instances normally do not observe transaction boundaries. This method makes transient instances sensitive to transaction completion. If an instance is modified in a transaction, and the transaction rolls back, the state of the instance is restored to the state
0

getObjectById(oid, validate)

it. If there is no transaction in progress, the returned instance will be hollow or persistent-nontransactional, at the choice of the implementation. If there is a transaction in progress, the returned instance ... is established to this instance, then the transaction in which the association was made will fail
0

flush()

to the data store. It has no effect if a transaction is not active. If a datastore transaction is active ... transaction is active, this method obtains a datastore connection, synchronizes the cache ... is held until the end of the transaction. If exceptions occur during flush, the implementation
0

flush()

to the data store. It has no effect if a transaction is not active. If a datastore transaction is active ... transaction is active, this method obtains a datastore connection, synchronizes the cache ... is held until the end of the transaction. If exceptions occur during flush, the implementation
0

currentTransaction()

Method javax.jdo.PersistenceManager Transaction currentTransaction() Return the Transaction instance associated with a PersistenceManager. There is one Transaction instance associated with each PersistenceManager instance. The Transaction instance supports options as well as transaction completion
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isTransactional(pc)

whether this object is transactional. Instances that respect transaction boundaries return true. These instances include transient instances made transactional as a result of being the target ... in data store transactions; and persistent instances modified in optimistic transactions. Transient
0

getDataStoreConnection()

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 will not be enlisted in any transaction. Returns: the JDOConnection instance Since: JDO 2.0

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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