About EntityManager

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JPA Doc
54

flush()

Method javax.persistence.EntityManager void flush() Synchronize the persistence context to the underlying database. Throws: TransactionRequiredException - if there is no transaction PersistenceException - if the flush fails Since: JPA 1.0
JPA Doc
54

getCriteriaBuilder()

Method javax.persistence.EntityManager CriteriaBuilder getCriteriaBuilder() Return an instance of CriteriaBuilder for the creation of CriteriaQuery objects. Returns: CriteriaBuilder instance Throws: IllegalStateException - if the entity manager has been closed Since: JPA 2.0
JPA Doc
54

getEntityManagerFactory()

Method javax.persistence.EntityManager EntityManagerFactory getEntityManagerFactory() Return the entity manager factory for the entity manager. Returns: EntityManagerFactory instance Throws: IllegalStateException - if the entity manager has been closed Since: JPA 2.0
JPA Doc
54

getFlushMode()

Method javax.persistence.EntityManager FlushModeType getFlushMode() Get the flush mode that applies to all objects contained in the persistence context. Returns: flushMode Since: JPA 1.0
JPA Doc
54

getLockMode(entity)

Method javax.persistence.EntityManager LockModeType getLockMode(   Object entity ) Get the current lock mode for the entity instance. Parameters: entity - entity instance Returns: lock mode Throws: TransactionRequiredException - if there is no transaction IllegalArgumentException - if the instance
JPA Doc
54

getMetamodel()

Method javax.persistence.EntityManager Metamodel getMetamodel() Return an instance of Metamodel interface for access to the metamodel of the persistence unit. Returns: Metamodel instance Throws: IllegalStateException - if the entity manager has been closed Since: JPA 2.0
JPA Doc
54

getProperties()

Method javax.persistence.EntityManager Map getProperties() Get the properties and hints and associated values that are in effect for the entity manager. Changing the contents of the map does not change the configuration in effect. Returns: map of properties and hints in effect for entity manager Since: JPA 2.0
JPA Doc
54

getReference(entityClass, primaryKey)

Method javax.persistence.EntityManager T getReference(   Class entityClass,   Object primaryKey ) Get an instance, whose state may be lazily fetched. If the requested instance does not exist in the database, the EntityNotFoundException is thrown when the instance state is first accessed
JPA Doc
54

getTransaction()

Method javax.persistence.EntityManager EntityTransaction getTransaction() Return the resource-level EntityTransaction object. The EntityTransaction instance may be used serially to begin and commit multiple transactions. Returns: EntityTransaction instance Throws: IllegalStateException - if invoked on a JTA entity manager Since: JPA 1.0
JPA Doc
54

isOpen()

Method javax.persistence.EntityManager boolean isOpen() Determine whether the entity manager is open. Returns: true until the entity manager has been closed Since: JPA 1.0