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47

getReference(entityClass, primaryKey)

Method javax.persistence.EntityManager T getReference( Class<T> 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
47

contains(entity)

Method javax.persistence.EntityManager boolean contains( Object entity ) Check if the instance is a managed entity instance belonging to the current persistence context. Parameters: entity - entity instance Returns: boolean indicating if entity is in persistence context Throws: IllegalArgumentException - if not an entity Since: JPA 1.0
47

find(entityClass, primaryKey, lockMode)

Method javax.persistence.EntityManager T find( Class<T> entityClass, Object primaryKey, LockModeType lockMode ) Find by primary key and lock. Search for an entity of the specified class and primary key and lock it with respect to the specified lock type. If the entity instance is contained in
47

refresh(entity)

Method javax.persistence.EntityManager void refresh( Object entity ) Refresh the state of the instance from the database, overwriting changes made to the entity, if any. Parameters: entity - entity instance Throws: IllegalArgumentException - if the instance is not an entity or the entity is not
47

find(entityClass, primaryKey)

Method javax.persistence.EntityManager T find( Class<T> entityClass, Object primaryKey ) Find by primary key. Search for an entity of the specified class and primary key. If the entity instance is contained in the persistence context, it is returned from there. Parameters: entityClass - entity
47

persist(entity)

Method javax.persistence.EntityManager void persist( Object entity ) Make an instance managed and persistent. Parameters: entity - entity instance Throws: EntityExistsException - if the entity already exists. (If the entity already exists, the EntityExistsException may be thrown when the persist
47

clear()

Method javax.persistence.EntityManager void clear() Clear the persistence context, causing all managed entities to become detached. Changes made to entities that have not been flushed to the database will not be persisted. Since: JPA 1.0
47

find(entityClass, primaryKey, lockMode, properties)

Method javax.persistence.EntityManager T find( Class<T> entityClass, Object primaryKey, LockModeType lockMode, Map<K,V> properties ) Find by primary key and lock, using the specified properties. Search for an entity of the specified class and primary key and lock it with respect to the specified
47

merge(entity)

Method javax.persistence.EntityManager T merge( T entity ) Merge the state of the given entity into the current persistence context. Parameters: entity - entity instance Returns: the managed instance that the state was merged to Throws: IllegalArgumentException - if instance is not an entity or
4

find(entityClass, primaryKey, lockMode, properties)

Methodjavax.persistence.EntityManager T find( Class<T> entityClass, Object primaryKey, LockModeType lockMode, Map<K,V> properties ) Find by primary key and lock, using the specified properties. Search for an entity of the specified class and primary key and lock it with respect to the specified

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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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